JPS6131810B2 - - Google Patents
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- Publication number
- JPS6131810B2 JPS6131810B2 JP6522179A JP6522179A JPS6131810B2 JP S6131810 B2 JPS6131810 B2 JP S6131810B2 JP 6522179 A JP6522179 A JP 6522179A JP 6522179 A JP6522179 A JP 6522179A JP S6131810 B2 JPS6131810 B2 JP S6131810B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetization
- oxygen
- solid solution
- amount
- atmosphere
- 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
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
【発明の詳細な説明】 本発明は新規な酸素センサーに関する。[Detailed description of the invention] The present invention relates to a novel oxygen sensor.
本発明者はさきにLaFeO3のオルソフエライト
のLaの一部をNaで置換固溶した系の
La1-xNaxFeO3-〓（δは酸素欠陥量を示す）の新
規物質を生成した。この置換固溶体はLaに対す
るNaの置換量が多くなるとα−NaFeO2相が析出
してLaFeO3の構造が変化する。しかしNaの置換
量、すなわちLa1-xNaxFeO3-〓のｘの値が0.25ま
での置換量においては、LaFeO3構造をそのまま
保持する酸素欠陥を含むオルソフエライトであ
る。このような固溶体におけるFeは大部分３価
の状態で存在する。しかし、この固溶体の電気伝
導度が異常に高いことから一部Fe4+が存在する
ものと考えられる。 The present inventor previously developed a system in which part of the La of orthoferrite LaFeO 3 was replaced with Na as a solid solution.
A new substance of La 1-x Na x FeO 3- (δ indicates the amount of oxygen vacancies) was produced. In this substitution solid solution, when the amount of Na substituted for La increases, α-NaFeO 2 phase precipitates and the structure of LaFeO 3 changes. However, when the amount of Na substitution, that is, the value of x in La 1-x Na x FeO 3- , is up to 0.25, it is an orthoferrite containing oxygen defects that maintains the LaFeO 3 structure as it is. Fe in such a solid solution exists mostly in a trivalent state. However, since the electrical conductivity of this solid solution is abnormally high, it is thought that some Fe 4+ is present.
本発明者はこの固溶体の性質について更に研究
した結果、その磁化が空気中と真空中で異つてく
ることを見出した。すなわち、この固溶体の磁化
を空気中で測定し、その後減圧にすると、磁化が
急激に低下し、やがて一定値となる。しかも、こ
の傾向はNaの置換量、すなわち前記ｘの値が
0.25までにおいては、置換量が多くなる程大きい
ことが明らかになつた。この試験結果は第１図の
通りであつた。なお図のσｇ（ｔ）／σｇ（ｏ）
においてσｇ（ｏ）は空中の磁化、σｇ（ｔ）は
減圧下である時間（ｔ）経過後の磁化を示す。 As a result of further research into the properties of this solid solution, the present inventor found that its magnetization differs in air and vacuum. That is, when the magnetization of this solid solution is measured in air and then the pressure is reduced, the magnetization decreases rapidly and eventually reaches a constant value. Moreover, this tendency is due to the amount of Na substitution, that is, the value of x mentioned above.
It became clear that up to 0.25, the larger the amount of substitution, the larger the value. The test results were as shown in Figure 1. In addition, σg(t)/σg(o) in the figure
In the equation, σg(o) represents the magnetization in air, and σg(t) represents the magnetization after a certain time (t) has elapsed under reduced pressure.
また、真空中に放置したものを再び空気中に放
置すると、磁化は回復しほぼ元の値となる。この
ように可逆的に変化することを知見した。この回
復現象は第２図に示す通りである。第２図はｘ＝
0.25のNa置換固溶体を使用した場合で、ａ線は
大気中、ｂ線は減圧中（10-3mmHg）、ｃ線は再び
大気中に戻して一晩放置したものを示す。なお図
中のσｇはグラム当りの磁化、Ｈは磁場の強さを
示す。 Furthermore, if something left in a vacuum is left in the air again, the magnetization will recover and return to almost its original value. We found that this change is reversible. This recovery phenomenon is shown in FIG. Figure 2 shows x=
When a 0.25 Na-substituted solid solution is used, the a-line is in the atmosphere, the b-line is under reduced pressure (10 -3 mmHg), and the c-line is returned to the atmosphere and left overnight. Note that σg in the figure indicates magnetization per gram, and H indicates the strength of the magnetic field.
この時出入りする酸素量は重量変化によつて測
定することができる。すなわち、ｘ＝0.25の乾燥
試料を真空デシケーター中で放置することによつ
て0.13重量％の重量減少認められた。これはまた
磁化の減少量にも比例すること及び再現性がある
ことから、試料中の酸素の離脱に起因するものと
考えられる。 The amount of oxygen entering and exiting at this time can be measured by the change in weight. That is, by leaving the dried sample with x=0.25 in a vacuum desiccator, a weight loss of 0.13% by weight was observed. Since this is also proportional to the amount of decrease in magnetization and is reproducible, it is considered to be caused by the elimination of oxygen in the sample.
この酸素の出入りを式で示すと、次のようなも
のと考えられる。 The equation for this inflow and outflow of oxygen is considered to be as follows.
La1-xNaxFe３＋ １−ｙFe４＋ ｙO3-x+y/2La1-xNaxFe３＋ １−ｙ′Fe４＋ ｙ′O３−ｘ＋ｙ／２＋（ｙ−y′）／２O2
このように、この固溶体は周囲の酸素分圧によ
つて磁化が大巾に変化し、しかも再現性があるの
で、磁化を測定することによつて、周囲の酸素分
圧を容易に知ることが可能である。La 1-x Na x Fe 3+ 1-y Fe 4+ y O 3-x+y/2 La 1-x Na x Fe 3+ 1-y ′Fe 4+ y ′O3-x+y/2+(y-y′)/ 2O 2 In this way, the magnetization of this solid solution changes greatly depending on the surrounding oxygen partial pressure, and since it is reproducible, it is easy to know the surrounding oxygen partial pressure by measuring the magnetization. Is possible.
さらに重量変化によつても雰囲気の酸素量を容
易に知ることができる。 Furthermore, the amount of oxygen in the atmosphere can be easily determined by the change in weight.
以上のように、LaFeO3のLaを５〜25アトム％
Naで置換固溶させたものは、磁化又は重量の変
化の測定により雰囲気中の酸素量を極めて容易に
感知することができ、その変化が可逆的であるた
め、反復使用し得られる優れた効果を有するもの
である。 As mentioned above, La of LaFeO 3 is 5 to 25 atoms%
Substituted solid solution with Na allows the amount of oxygen in the atmosphere to be detected extremely easily by measuring changes in magnetization or weight, and since the changes are reversible, excellent effects can be obtained by repeated use. It has the following.
第１図は本発明の酸素センサーにおける磁化の
時間変化図、第２図は本発明の酸素センサーの室
温における磁化と磁場の関係図である。
ａ：大気中の曲線、ｂ：減圧中の曲線、ｃ：大
気圧に戻したときの曲線。
FIG. 1 is a diagram showing the change in magnetization over time in the oxygen sensor of the present invention, and FIG. 2 is a diagram showing the relationship between magnetization and magnetic field at room temperature in the oxygen sensor of the present invention. a: Curve in the atmosphere, b: Curve during depressurization, c: curve when returning to atmospheric pressure.
Claims (1)
せたものを用いてその磁化変化または重量変化を
測定し、その雰囲気中の酸素量を測定するように
構成したことを特徴とする酸素センサー。1. It is characterized by being configured so that the magnetization change or weight change is measured using LaFeO3 in which La is substituted with 5 to 25 atomic % Na as a solid solution, and the amount of oxygen in the atmosphere is measured. oxygen sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6522179A JPS55156860A (en) | 1979-05-25 | 1979-05-25 | Oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6522179A JPS55156860A (en) | 1979-05-25 | 1979-05-25 | Oxygen sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55156860A JPS55156860A (en) | 1980-12-06 |
| JPS6131810B2 true JPS6131810B2 (en) | 1986-07-23 |
Family
ID=13280636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6522179A Granted JPS55156860A (en) | 1979-05-25 | 1979-05-25 | Oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55156860A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0241904U (en) * | 1988-09-13 | 1990-03-22 |
-
1979
- 1979-05-25 JP JP6522179A patent/JPS55156860A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0241904U (en) * | 1988-09-13 | 1990-03-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55156860A (en) | 1980-12-06 |
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