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JPH0563882B2 - - Google Patents
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JPH0563882B2 - - Google Patents

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Publication number
JPH0563882B2
JPH0563882B2 JP62067928A JP6792887A JPH0563882B2 JP H0563882 B2 JPH0563882 B2 JP H0563882B2 JP 62067928 A JP62067928 A JP 62067928A JP 6792887 A JP6792887 A JP 6792887A JP H0563882 B2 JPH0563882 B2 JP H0563882B2
Authority
JP
Japan
Prior art keywords
mol
dielectric ceramic
composition
tio
bao
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
Application number
JP62067928A
Other languages
Japanese (ja)
Other versions
JPS63236210A (en
Inventor
Toyosaku Sato
Minoru Saito
Kazutoshi Ayusawa
Matsue Nakayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP62067928A priority Critical patent/JPS63236210A/en
Publication of JPS63236210A publication Critical patent/JPS63236210A/en
Publication of JPH0563882B2 publication Critical patent/JPH0563882B2/ja
Granted legal-status Critical Current

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Description

【発明の詳細な説明】[Detailed description of the invention]

(産業上の利用分野) この発明は、マイクロ波用の誘電体磁器組成物
に関するものである。 (従来の技術) 温度保償用磁器コンデンサやカイクロ波回路用
の誘電体共振器などでは、誘電体磁器組成物とし
て、比誘電率(εr)および無負荷Q(Qu)が大き
く、共振周波数の温度係数(τf)が電極材料など
を考慮して0を中心にして正または負の任意の温
度係数が得られることが必要とされている。 従来そのような誘電体磁器組成物としては、
BaO・TiO2系、MgTiO3−CaO系、(Sn、Zr)
TiO4系などが使用されていた。 (発明が解決しようとする問題点) しかし、これらの誘電体磁器組成物を用いて誘
電体共振器やコンデンサを製造した場合、その温
度係数(τf)が0(ppm/℃)付近ではその比誘
電率(εr)が20〜40と小さく、その結果、誘電体
共振器などの小形化が不可能であるという欠点が
あつた。 この発明は、これらの欠点を解決するため、温
度係数(τf)が0ppm/℃付近においても比誘電
率(εr)および無負荷Qが大きい誘電体磁器組成
物を提供することを目的とする。 (問題点を解決するための手段) この発明の誘電体磁器組成物は、(BaO)・
(TiO2)x系組成物、Sm2O3およびEr2O3からな
る誘電体磁器組成物であつて、酸化物置換で BaO:18.6〜22.4モル% TiO2:61.7〜68.6モル% Sm2O3:10〜17モル% Er2O3:1〜5モル% の組成範囲としたことを特徴とするものである。 (作用) 上記のような誘電体磁器組成物は、共振周波数
の温度係数(τf)が0(ppm/℃)付近でも比誘
導率(εr)および無負荷Qが大きく、かつ組成変
化によつて広範囲に温度係数が変化する。 (実施例) 以下この発明の実施例を詳細に説明する。 出発原料として化学的に高純度のBaCO3
TiO2、Sm2O3およびEr2O3を第1表および第2表
に示す組成比率にて混合し、空気中において1060
℃の温度下で2時間仮焼した。
(Industrial Application Field) This invention relates to a dielectric ceramic composition for microwave use. (Prior art) In ceramic capacitors for temperature compensation and dielectric resonators for cyclowave circuits, dielectric ceramic compositions have large relative permittivity (ε r ) and no-load Q (Qu), and the resonant frequency It is required that an arbitrary positive or negative temperature coefficient (τ f ) around 0 can be obtained in consideration of the electrode material and the like. Conventionally, such dielectric ceramic compositions include:
BaO・TiO 2 system, MgTiO 3 −CaO system, (Sn, Zr)
TiO 4 series etc. were used. (Problem to be solved by the invention) However, when dielectric resonators and capacitors are manufactured using these dielectric ceramic compositions, when the temperature coefficient (τ f ) is around 0 (ppm/℃), The dielectric constant (ε r ) is as small as 20 to 40, and as a result, it has the disadvantage that it is impossible to miniaturize dielectric resonators and the like. In order to solve these drawbacks, the present invention aims to provide a dielectric ceramic composition that has a large relative permittivity (ε r ) and a high no-load Q even when the temperature coefficient (τ f ) is around 0 ppm/°C. do. (Means for solving the problem) The dielectric ceramic composition of the present invention has (BaO).
A dielectric ceramic composition consisting of a (TiO 2 )x-based composition, Sm 2 O 3 and Er 2 O 3 , in which BaO: 18.6 to 22.4 mol% TiO 2 : 61.7 to 68.6 mol% Sm 2 It is characterized by having a composition range of O 3 : 10 to 17 mol % and Er 2 O 3 : 1 to 5 mol %. (Function) The dielectric ceramic composition described above has a large specific inductivity (ε r ) and no-load Q even when the temperature coefficient (τ f ) of the resonant frequency is around 0 (ppm/°C), and is sensitive to composition changes. Therefore, the temperature coefficient changes over a wide range. (Example) Examples of the present invention will be described in detail below. Chemically pure BaCO 3 as starting material,
TiO 2 , Sm 2 O 3 and Er 2 O 3 were mixed at the composition ratios shown in Tables 1 and 2, and the mixture was heated to 1060 °C in air.
It was calcined for 2 hours at a temperature of ℃.

【表】【table】

【表】 得られた仮焼物をポツトミルで純粋とともに湿
式粉砕し、脱水乾燥後バインダを添加して造粒
し、32メツシユのふるいを通して整粒した。得ら
れた粉体は、金型と油圧プレスを用いて成形圧力
1〜3ton/cm2で直径16mm、厚さ9mmの円板状の成
形体とした。そして、この成形体を高純度のアル
ミナ匣に入れ、1260℃〜1450℃2時間の焼成条件
で焼成し誘電体磁器組成物を得た。 得られた誘電体磁器組成物についてハツキ・コ
ールマン法によつて比誘電率(εr)と無負荷Q
(Qu)を測定した。また、共振周波数の温度係数
τfは、(1)式に従つて20℃における共振周波数を基
準にして−40℃から80℃の温度範囲における値か
ら求めた。それらの結果を第2表に示す。 τf=f(80)−f(−40)/f(20)・1/△T(ppm
/℃) ……(1) ただし、 f(20):20℃における共振周波数 f(−40):−40℃における共振周波数 f(80):80℃における共振周波数 △T:温度差、ここでは80+40=120℃ これらの測定における共振周波数は3〜6GHz
であつた。 第2表において、*印を付した資料番号のもの
は本発明の範囲外の比較例であり、それ以外の試
料が本発明範囲内の実施例である。 第1表および第2表の結果によれば、
(BaO)・(TiO2)xが79モル%未満ならびに85モ
ル%を超えると、無負荷Q(Qu)が小さく、比誘
電率(εr)も小さくなり不適当である。また、
Sm2O3が10モル%未満ならびに17モル%を超え
ると、無負荷Qが小さく、比誘電率(εr)も小さ
くなり不適当である。さらに、Er2O3が1モル%
未満ならびに5モル%を超えると、無負荷Qが小
さく、比誘電率(εr)も小さくなり不適当であ
る。 したがつて、実用的にみて、(BaO)・(TiO2
xが79〜85モル%、Sm2O3:10〜17モル%、
Er2O3:1〜5モル%の範囲が適当である。ここ
で、(BaO)・(TiO2)xのXは、X=3.8〜4.2モ
ルであることから、BaO:18.6〜22.4モル%、
TiO2:61.7〜68.6モル%、Sm2O3:10〜17モル%
およびEr2O3:1〜5モル%の範囲が適当であ
る。 また、前記第2表によれば、本発明の誘導体磁
器組成物は、共振周波数の温度係数(τf)が0
(ppm/℃)付近でも大きな比誘電率(εr)と無
負荷Q(Qu)が得られていることが分り、さらに
組成変化によつて広範囲に温度係数が変化するこ
とが分る。 (発明の効果) 以上のように、この発明の誘電体磁器組成物に
よれば、マイクロ波領域において共振周波数の温
度係数(τf)が0(ppm/℃)付近でも無負荷Q
(Qu)が大きく、かつ誘電率(εr)も大きく、さ
らに組成変化によつて広範囲に温度係数τfを変化
させることができるので、マイクロ波用誘電体共
振器あるいは温度補償用コンデンサなどの誘電体
磁器組成物として利用することができる。
[Table] The obtained calcined product was wet-milled with pure powder in a pot mill, dehydrated and dried, and then granulated by adding a binder, and sized by passing through a 32-mesh sieve. The obtained powder was molded into a disc-shaped body with a diameter of 16 mm and a thickness of 9 mm using a mold and a hydraulic press at a molding pressure of 1 to 3 ton/cm 2 . Then, this molded body was placed in a high-purity alumina box and fired under firing conditions of 1260°C to 1450°C for 2 hours to obtain a dielectric ceramic composition. The dielectric constant (ε r ) and no-load Q of the obtained dielectric ceramic composition were determined by the Hatsuki-Coleman method.
(Qu) was measured. Further, the temperature coefficient τ f of the resonant frequency was determined from the value in the temperature range from −40° C. to 80° C. based on the resonant frequency at 20° C. according to equation (1). The results are shown in Table 2. τ f = f(80)-f(-40)/f(20)・1/△T(ppm
/℃) ...(1) However, f(20): Resonance frequency at 20℃ f(-40): Resonance frequency at -40℃ f(80): Resonance frequency at 80℃ △T: Temperature difference, here 80+40=120℃ Resonance frequency in these measurements is 3~6GHz
It was hot. In Table 2, the samples marked with * are comparative examples outside the scope of the present invention, and the other samples are examples within the scope of the present invention. According to the results in Tables 1 and 2,
If (BaO).(TiO 2 ) x is less than 79 mol % or exceeds 85 mol %, the unloaded Q (Qu) will be small and the relative permittivity (ε r ) will also be small, making it unsuitable. Also,
If Sm 2 O 3 is less than 10 mol % or exceeds 17 mol %, the unloaded Q will be small and the relative permittivity (ε r ) will also be small, making it unsuitable. Furthermore, Er 2 O 3 is 1 mol%
If it is less than or exceeds 5 mol %, the unloaded Q will be small and the relative permittivity (ε r ) will also be small, making it unsuitable. Therefore, from a practical point of view, (BaO)・(TiO 2 )
x is 79 to 85 mol%, Sm2O3 : 10 to 17 mol%,
Er 2 O 3 : A range of 1 to 5 mol % is appropriate. Here, since X in (BaO)/(TiO 2 ) x is X=3.8 to 4.2 mol, BaO: 18.6 to 22.4 mol%,
TiO2 : 61.7-68.6 mol%, Sm2O3 : 10-17 mol%
and Er2O3 : a range of 1 to 5 mol% is appropriate. Further, according to Table 2, the dielectric ceramic composition of the present invention has a temperature coefficient (τ f ) of the resonance frequency of 0.
It can be seen that a large relative permittivity (ε r ) and no-load Q (Qu) are obtained even around (ppm/°C), and that the temperature coefficient changes over a wide range as the composition changes. (Effects of the Invention) As described above, according to the dielectric ceramic composition of the present invention, the no-load Q
(Qu) and dielectric constant (ε r ) are large, and the temperature coefficient τ f can be varied over a wide range by changing the composition. It can be used as a dielectric ceramic composition.

Claims (1)

【特許請求の範囲】 1 (BaO)・(TiO2)x系組成物、酸化サマリ
ウム(Sm2O3)および酸化エルビウム(Er2O3
からなる誘電体磁器組成物であつて、酸化物換算
で BaO:18.6〜22.4モル% TiO2:61.7〜68.6モル% Sm2O3:10〜17モル% Er2O3:1〜5モル% の組成範囲としたことを特徴とする誘電体磁器組
成物。
[Claims] 1 (BaO)/(TiO 2 ) x-based composition, samarium oxide (Sm 2 O 3 ) and erbium oxide (Er 2 O 3 )
A dielectric ceramic composition consisting of BaO: 18.6 to 22.4 mol% TiO 2 : 61.7 to 68.6 mol% Sm 2 O 3 : 10 to 17 mol% Er 2 O 3 : 1 to 5 mol% in terms of oxides. A dielectric ceramic composition characterized in that it has a composition range of.
JP62067928A 1987-03-24 1987-03-24 Dielectric ceramic composition Granted JPS63236210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62067928A JPS63236210A (en) 1987-03-24 1987-03-24 Dielectric ceramic composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62067928A JPS63236210A (en) 1987-03-24 1987-03-24 Dielectric ceramic composition

Publications (2)

Publication Number Publication Date
JPS63236210A JPS63236210A (en) 1988-10-03
JPH0563882B2 true JPH0563882B2 (en) 1993-09-13

Family

ID=13359064

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62067928A Granted JPS63236210A (en) 1987-03-24 1987-03-24 Dielectric ceramic composition

Country Status (1)

Country Link
JP (1) JPS63236210A (en)

Also Published As

Publication number Publication date
JPS63236210A (en) 1988-10-03

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