JP2538438B2 - Method for producing lead-based dielectric ceramic composition - Google Patents
Method for producing lead-based dielectric ceramic compositionInfo
- Publication number
- JP2538438B2 JP2538438B2 JP3089603A JP8960391A JP2538438B2 JP 2538438 B2 JP2538438 B2 JP 2538438B2 JP 3089603 A JP3089603 A JP 3089603A JP 8960391 A JP8960391 A JP 8960391A JP 2538438 B2 JP2538438 B2 JP 2538438B2
- Authority
- JP
- Japan
- Prior art keywords
- lead
- phase
- dielectric ceramic
- ceramic composition
- based dielectric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000203 mixture Substances 0.000 title claims description 26
- 239000000919 ceramic Substances 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 claims description 37
- 229910000464 lead oxide Inorganic materials 0.000 claims description 21
- 239000002994 raw material Substances 0.000 claims description 14
- 150000001875 compounds Chemical class 0.000 claims description 9
- 238000001354 calcination Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000012071 phase Substances 0.000 description 34
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 15
- 239000000843 powder Substances 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000003746 solid phase reaction Methods 0.000 description 2
- 241000287463 Phalacrocorax Species 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N nickel(II) oxide Inorganic materials [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Insulating Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は磁器コンデンサの誘電
体層に用いる鉛系誘電体磁器組成物の製造方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a lead-based dielectric ceramic composition used for a dielectric layer of a ceramic capacitor.
【０００２】[0002]
【従来の技術】鉛系誘電体磁器組成物は、一般に、酸化
鉛を含む原料化合物粉を充分に混合してから仮焼し、こ
の仮焼によって原料化合物間で固相反応を生じさせ、こ
の反応生成物を成形して焼結させることによって作成さ
れている。2. Description of the Related Art In general, a lead-based dielectric ceramic composition is prepared by thoroughly mixing raw material compound powders containing lead oxide and then calcining the mixture to cause a solid-phase reaction between the raw material compounds. It is made by molding and sintering the reaction product.
【０００３】ここで、酸化鉛としてはＰｂ3 Ｏ4 ，Ｐｂ
Ｏ等が使用され、酸化鉛以外の原料化合物としてはＭｇ
Ｏ，Ｎｂ2 Ｏ5 ，ＺｎＯ，ＮｉＯ，ＴｉＯ2 ，Ｗ，Ａｇ
等が使用されている。また、不純物は得られた誘電体磁
器組成物の電気的諸特性に大きな影響を及ぼすので、こ
れらの原料化合物としては不純物の少ない高純度のもの
が使用されている。また、仮焼は、例えば８００℃、３
Ｈｒ程度の条件で行なわれ、焼結は、例えば１２００
℃、２Ｈｒ程度の条件で行なわれている。Here, as lead oxide, Pb 3 O 4 and Pb are used.
O or the like is used, and Mg is used as a raw material compound other than lead oxide.
O, Nb 2 O 5 , ZnO, NiO, TiO 2 , W, Ag
Etc. are used. Further, since impurities have a great influence on various electrical characteristics of the obtained dielectric ceramic composition, high-purity compounds containing few impurities are used as these raw material compounds. Moreover, calcination is, for example, 800 ° C., 3
The sintering is performed under the condition of about Hr, for example, 1200
It is carried out under the conditions of ° C and about 2 hours.
【０００４】[0004]
【発明が解決しようとする課題】ところで、鉛系誘電体
磁器組成物を従来の方法で製造する場合、鉛の原材料と
しては酸化鉛を使用することが多い。この時の酸化鉛
は、分子式でＰｂ3 Ｏ4 又はＰｂＯと表わされる酸化物
を用いることがほとんどであるが、従来は結晶形には着
目せず、その分子中に含有されるＰｂの原子量にのみ注
意して使用していた。By the way, when a lead-based dielectric ceramic composition is manufactured by a conventional method, lead oxide is often used as a raw material of lead. As the lead oxide at this time, an oxide represented by Pb 3 O 4 or PbO in the molecular formula is used in most cases, but conventionally, no attention was paid to the crystal form, and the atomic weight of Pb contained in the molecule was not used. Only used with caution.
【０００５】 ところが、一般的に良く知られれている
様に、ＰｂＯは高温形と低温形の２通りの結晶形をと
り、それぞれが異なる反応性を示す。また、Ｐｂ３Ｏ４
とされている酸化物も実際にはＰｂＯをある割合で含ん
でいることが多い。従来は、以上の様に結晶形が同一で
なく、反応性の異なる結晶形のものを異なる比率で含有
しているＰｂＯを使用していたため、所望の電気的特性
を備えた誘電体磁器組成物が得られないことがあるとい
う不具合があった。However, as is generally well known, PbO has two types of crystal forms, a high temperature type and a low temperature type, and each shows different reactivity. In addition, Pb 3 O 4
In many cases, the oxides said to actually contain PbO in a certain ratio. Conventionally, the crystal forms are not the same as described above, but the crystal forms with different reactivity are contained in different ratios.
The desired electrical characteristics
It may not be possible to obtain a dielectric porcelain composition with
Cormorants there was a problem.
【０００６】 更に、焼成中の鉛の蒸発による組成変動
を防ぐため、蒸発によって減少すると予想される量の鉛
酸化物をあらかじめ過剰に添加しておくことが、実際の
製造においてしばしば実施されるが、この場合、鉛の蒸
発量は製造条件によって影響を受けるため、正確な値を
求めることは非常に困難であった。このため、鉛が不足
になって焼結しなかったり、余剰分に含まれるマシコッ
ト相以外の相（リサージ相）が低誘電率相を形成し、全
体の誘電率を低下させたりして、材料としての安定性に
欠けることがあった。Further, in order to prevent a composition change due to evaporation of lead during firing, it is often practiced in actual production to add an excessive amount of lead oxide which is expected to be reduced by evaporation. In this case, since the evaporation amount of lead is affected by the manufacturing conditions, it was very difficult to obtain an accurate value. As a result, the lead will be insufficient and will not sinter, or the excess metal contained in the excess will
Phase (litharge phase) other than G phase forms low dielectric constant phase,
The dielectric constant of the body was lowered , and the stability as a material was sometimes lacking.
【０００７】この発明は、所望の電気的諸特性を備えた
鉛系誘電体磁器組成物を常に得ることのできる鉛系誘電
体磁器組成物の製造方法を提供することを目的とする。It is an object of the present invention to provide a method for producing a lead-based dielectric ceramic composition which can always obtain a lead-based dielectric ceramic composition having desired electrical characteristics.
【０００８】[0008]
【課題を解決するための手段】 この発明に係る鉛系誘
電体磁器組成物の製造方法は、酸化鉛を目的組成物より
過剰に含む原料化合物を仮焼し、この仮焼によって得ら
れたものを成形し、この成形によって得られたものを焼
成してなる鉛系誘電体磁器組成物の製造方法において、
前記酸化鉛としてマシコット相を７５モル％以上含むＰ
ｂＯを使用したことを特徴とするものである。Means for Solving the Problems A method for producing a lead-based dielectric ceramic composition according to the present invention is one obtained by calcining a raw material compound containing lead oxide in excess of the target composition, and performing the calcining. In the method for producing a lead-based dielectric ceramic composition obtained by molding, and baking the product obtained by this molding,
P containing 75 mol% or more of the Machicot phase as the lead oxide
It is characterized by using bO .
【０００９】 ここで、原料化合物としては、酸化鉛以
外に、Ｍｇ，Ｎｂ，Ｚｎ，Ｎｉ，Ｔｉ，Ｗ，Ａｇ等から
選択された１種または２種以上の元素の酸化物を含むも
のを使用することができる。Here, as the raw material compound, lead oxide
Outside, it is possible to use those containing Mg, Nb, Zn, Ni, Ti, W, an oxide of one or more elements selected from Ag or the like.
【００１０】また、酸化鉛としてマシコット相を７５モ
ル％以上含むＰｂＯを使用することとしたのは、酸化鉛
に含まれているマシコット相が７５モル％以上の場合は
所望の比誘電率を有する誘電体磁器組成物が得られる
が、酸化鉛に含まれているマシコット相が７５モル％未
満の場合は所望の比誘電率を有する誘電体磁器組成物が
得られなくなるからである。Further, PbO containing 75 mol% or more of the Machicot phase as lead oxide is used because the desired dielectric constant is obtained when the Machicot phase contained in the lead oxide is 75 mol% or more. This is because a dielectric ceramic composition can be obtained, but if the Mascot phase contained in lead oxide is less than 75 mol%, a dielectric ceramic composition having a desired relative dielectric constant cannot be obtained.
【００１１】なお、マシコット相を７５モル％以上含む
ＰｂＯ、すなわちマシコット相含有率の高いＰｂＯは、
マシコット相が高温で最も安定に作られる相であること
から、熱処理によって容易に得ることができる。PbO containing 75 mol% or more of the mascotte phase, that is, PbO having a high mascotte phase content is
Since the Mascot phase is the most stable phase produced at high temperature, it can be easily obtained by heat treatment.
【００１２】更に、仮焼は、温度７００〜８５０℃、時
間１〜１０Ｈｒ程度の条件で行なうことができ、焼成
は、温度１０００〜１３００℃、時間０．５〜１０Ｈｒ
程度の条件で行なうことができる。Further, the calcination can be carried out under the conditions of a temperature of 700 to 850 ° C. and a time of about 1 to 10 hours, and a firing of a temperature of 1000 to 1300 ° C. and a time of 0.5 to 10 hours.
It can be performed under moderate conditions.
【００１３】なお、この発明は後述する実施例に示され
た組成のものに限定されるものではなく、他の組成の鉛
系誘誘電体磁器組成物にも同様に適用できるものであ
る。The present invention is not limited to the compositions shown in the examples described later, but can be similarly applied to lead-based dielectric ceramic compositions having other compositions.
【００１４】[0014]
【作用】ＰｂＯ（マシコット相）はＢサイト原子（例え
ばＭｇＯ，Ｎｂ2Ｏ5 ）と固相反応する場合に、目的反
応物であるペロブスカイト相を生成するのと同時に、あ
る割合で副生成物であるパイロクロア相（粒子として焼
結体中に存在し、全体の電気的特性にはほとんど影響を
及ぼさない）を生成する。このパイロクロア相は過剰の
鉛原子が存在すると生成され、しかもペロブスカイト相
に比べて鉛原子の含有量が高いため多量の鉛原子をトラ
ップして吸収し、鉛原子量を調節する。When PbO (mashikot phase) reacts with B site atom (eg MgO, Nb 2 O 5 ) in a solid state, it produces a perovskite phase which is a target reactant, and at the same time, it is a by-product in a certain proportion. It produces a pyrochlore phase, which exists in the sintered body as particles and has little effect on the overall electrical properties. This pyrochlore phase is generated when excess lead atoms are present, and since the content of lead atoms is higher than that of the perovskite phase, a large amount of lead atoms are trapped and absorbed, and the amount of lead atoms is adjusted.
【００１５】[0015]
【実施例】実施例１ まず、ＰｂＯ（マシコット相：１００モル％），ＭｇＯ
及びＮｂ2 Ｏ5 の各原料粉末を、Ｐｂ（Ｍｇ1/3 Ｎｂ
2/3 ）Ｏ3 が生成される比率で秤量した。また、焼成過
程におけるＰｂＯの蒸発分の補償として、ＰｂＯ（マシ
コット相：１００モル％）をこの原料粉末の全体量に対
して０．５，１．０，２．０，４．０，６．０，８．
０，１０．０モル％となる量だけ秤量した。EXAMPLES Example 1 First, PbO (Masicotte phase: 100 mol%), MgO
And Nb 2 O 5 raw material powders were mixed with Pb (Mg 1/3 Nb
2/3 ) Weighed at a ratio to produce O 3 . In addition, PbO (Masicotte phase: 100 mol%) is added to the raw material powder in an amount of 0.5, 1.0, 2.0, 4.0, 6. 0,8.
It was weighed only in an amount of 0.1 mol%.
【００１６】次に、アルミナボールを入れた樹脂ポット
内にこれらの原料粉末及び過剰ＰｂＯを入れ、更にエタ
ノールを加えてこの樹脂ポットを２０Ｈｒ回転させ、こ
れらの原料粉末及び過剰ＰｂＯを湿式状態で充分に混合
した。Next, these raw material powders and excess PbO are placed in a resin pot containing alumina balls, ethanol is further added, and this resin pot is rotated for 20 hours, and these raw material powders and excess PbO are sufficiently wet. Mixed in.
【００１７】次に、この混合によって得られた混合物を
乾燥させ、８００℃で５Ｈｒ仮焼して混合物間で固相反
応を生じさせた。この反応によって、ペロブスカイト相
｛Ｐｂ（Ｍｇ1/3 Ｎｂ2/3 ）Ｏ3 ｝と、少量のパイロク
ロア相（Ｐｂ2 Ｎｂ2 Ｏ7 ）が生成された。Next, the mixture obtained by this mixing was dried and calcined at 800 ° C. for 5 hours to cause a solid-phase reaction between the mixtures. By this reaction, a perovskite phase {Pb (Mg 1/3 Nb 2/3 ) O 3 } and a small amount of pyrochlore phase (Pb 2 Nb 2 O 7 ) were produced.
【００１８】次に、この仮焼によって得られたものをボ
ールミルで粉砕し、有機バインダーを添加して造粒し、
この造粒物を１ｔ／ｃｍ2 の圧力で加圧成形して直径１
ｃｍφ、厚さ１ｍｍの円板状の成形物を得た。そして、
この円板状の成形物をジルコニア質のセッター上に並
べ、緻密質アルミナサヤ中において１２００℃で３Ｈｒ
焼成して焼結体を得た。Next, the product obtained by this calcination is crushed by a ball mill, an organic binder is added and granulated,
This granulated product was pressure-molded at a pressure of 1 t / cm 2 to have a diameter of 1
A disk-shaped molded product having a cmφ and a thickness of 1 mm was obtained. And
The disk-shaped moldings were lined up on a zirconia setter and placed in a dense alumina sheath at 1200 ° C. for 3 hours.
It baked and the sintered compact was obtained.
【００１９】次に、Ｘ線回折法によりこの焼結体中のペ
ロブスカイト相とパイロクロア相の存在比率を求めた。
更に、この焼結体の両面にＡｇ焼付電極を形成し、この
焼結体の比誘電率を測定した。結果は表１の試料Ｎｏ．
２〜８に示す通りとなった。Next, the abundance ratio of the perovskite phase and the pyrochlore phase in this sintered body was determined by the X-ray diffraction method.
Further, Ag baked electrodes were formed on both surfaces of this sintered body, and the relative dielectric constant of this sintered body was measured. The results are shown in Sample No. 1 of Table 1.
It became as shown in 2-8.
【００２０】なお、過剰ＰｂＯの効果を確認するため
に、ＰｂＯの過剰添加なしの場合についても同様の実験
をした。結果は表１の試料Ｎｏ．１に示す通りとなっ
た。Incidentally, in order to confirm the effect of excess PbO, the same experiment was carried out even when PbO was not excessively added. The results are shown in Sample No. 1 of Table 1. It became as shown in 1.
【００２１】比較例１ 酸化鉛としてＰｂ3 Ｏ4 を使用し、実施例１と同様にし
て焼結体を形成し、Ｘ線回折法によりこの焼結体中のペ
ロブスカイト相とパイロクロア相の存在比率を求めた。
更に、この焼結体の両面にＡｇ焼付電極を形成し、この
焼結体の比誘電率を測定した。結果は表１の試料Ｎｏ．
２５〜３２に示す通りとなった。Comparative Example 1 Pb 3 O 4 was used as lead oxide, a sintered body was formed in the same manner as in Example 1, and the abundance ratio of the perovskite phase and the pyrochlore phase in this sintered body was measured by the X-ray diffraction method. I asked.
Further, Ag baked electrodes were formed on both surfaces of this sintered body, and the relative dielectric constant of this sintered body was measured. The results are shown in Sample No. 1 of Table 1.
It became as shown in 25-32.
【００２２】実施例２ 酸化鉛として、マシコット相が７５モル％、マシコット
相以外の酸化鉛が２５モル％のものを使用し、実施例１
と同様にして焼結体を形成し、Ｘ線回折法によりこの焼
結体中のペロブスカイト相とパイロクロア相の存在比率
を求めた。更に、この焼結体の両面にＡｇ焼付電極を形
成し、この焼結体の比誘電率を測定した。結果は表１の
試料Ｎｏ．９〜１６に示す通りとなった。Example 2 As lead oxide, one having 75 mol% of the Machicot phase and 25 mol% of lead oxide other than the Machicot phase was used.
A sintered body was formed in the same manner as in 1. and the abundance ratio of the perovskite phase and the pyrochlore phase in this sintered body was determined by the X-ray diffraction method. Further, Ag baked electrodes were formed on both surfaces of this sintered body, and the relative dielectric constant of this sintered body was measured. The results are shown in Sample No. 1 of Table 1. It became as shown in 9-16.
【００２３】比較例２ 酸化鉛として、マシコット相が７０モル％、マシコット
相以外の酸化鉛が３０モル％のものを使用し、実施例１
と同様にして焼結体を形成し、Ｘ線回折法によりこの焼
結体中のペロブスカイト相とパイロクロア相の存在比率
を求めた。更に、この焼結体の両面にＡｇ焼付電極を形
成し、この焼結体の比誘電率を測定した。結果は表１の
試料Ｎｏ．１７〜２４に示す通りとなった。COMPARATIVE EXAMPLE 2 As lead oxide, one having 70 mol% of the Machicot phase and 30 mol% of lead oxide other than the Machicot phase was used.
A sintered body was formed in the same manner as in 1. and the abundance ratio of the perovskite phase and the pyrochlore phase in this sintered body was determined by the X-ray diffraction method. Further, Ag baked electrodes were formed on both surfaces of this sintered body, and the relative dielectric constant of this sintered body was measured. The results are shown in Sample No. 1 of Table 1. It became as shown in 17-24.
【００２４】[0024]
【表１】 [Table 1]
【００２５】[0025]
【発明の効果】 この発明においては、マシコット相を
７５モル％以上含有するＰｂＯを原材料として使用した
ので、過剰に添加する酸化鉛の量を厳密に調整すること
なく、最適組成比の材料を作成することができ、従っ
て、所望の電気的諸特性を備えた鉛系誘電体磁器組成物
を常に得ることができるという効果がある。In the present invention, the Mashikot phase is
Since PbO containing 75 mol% or more was used as a raw material, it is possible to prepare a material having an optimum composition ratio without strictly adjusting the amount of lead oxide to be added excessively. Therefore, desired electrical characteristics can be obtained. It is possible to always obtain a lead-based dielectric ceramic composition provided with.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 水野 洋一 東京都台東区上野６丁目16番20号 太陽 誘電株式会社内 (56)参考文献 特開 昭63−225404（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Mizuno 6-16-20 Ueno Taito-ku, Tokyo Within Taiyo Yuden Co., Ltd. (56) Reference JP-A-63-225404 (JP, A)
Claims (2)
に含む原料化合物を仮焼し、この仮焼によって得られた
ものを成形し、この成形によって得られたものを焼成し
てなる鉛系誘電体磁器組成物の製造方法において、前記
酸化鉛としてマシコット相を７５モル％以上含むＰｂＯ
を使用したことを特徴とする鉛系誘電体磁器組成物の製
造方法。1. A method in which a raw material compound containing lead oxide in excess of the stoichiometry of a target composition is calcined, a product obtained by this calcining is molded, and a product obtained by this molding is calcined. In the method for producing a lead-based dielectric ceramic composition, PbO containing 75 mol% or more of a Mascot phase as the lead oxide.
A method for producing a lead-based dielectric ceramic composition, comprising:
Ｚｎ，Ｎｉ，Ｔｉ，Ｗ，Ａｇから選択された１種または
２種以上の元素の酸化物とを含むものからなることを特
徴とする請求項１記載の鉛系誘電体磁器組成物の製造方
法。2. A raw material compound is lead oxide, Mg, Nb,
2. The method for producing a lead-based dielectric ceramic composition according to claim 1, comprising an oxide of one or more elements selected from Zn, Ni, Ti, W, and Ag. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3089603A JP2538438B2 (en) | 1991-03-28 | 1991-03-28 | Method for producing lead-based dielectric ceramic composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3089603A JP2538438B2 (en) | 1991-03-28 | 1991-03-28 | Method for producing lead-based dielectric ceramic composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04301311A JPH04301311A (en) | 1992-10-23 |
| JP2538438B2 true JP2538438B2 (en) | 1996-09-25 |
Family
ID=13975339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3089603A Expired - Lifetime JP2538438B2 (en) | 1991-03-28 | 1991-03-28 | Method for producing lead-based dielectric ceramic composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2538438B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS526289B2 (en) * | 1972-01-25 | 1977-02-21 |
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1991
- 1991-03-28 JP JP3089603A patent/JP2538438B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04301311A (en) | 1992-10-23 |
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