JP3265507B2 - Zirconia oxygen ion conductor - Google Patents
Zirconia oxygen ion conductorInfo
- Publication number
- JP3265507B2 JP3265507B2 JP34771391A JP34771391A JP3265507B2 JP 3265507 B2 JP3265507 B2 JP 3265507B2 JP 34771391 A JP34771391 A JP 34771391A JP 34771391 A JP34771391 A JP 34771391A JP 3265507 B2 JP3265507 B2 JP 3265507B2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen ion
- zirconia
- ion conductor
- crystal
- plane
- 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 - Fee Related
Links
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ジルコニア質酸素イオ
ン導電体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zirconia oxygen ion conductor.
【０００２】[0002]
【従来の技術】従来、安定化剤を含む立方晶ジルコニア
成形体と電極とからなる酸素イオン導電体が知られてい
るが、いずれもランダムな結晶方位にある結晶集合体か
らなる焼結体であった。2. Description of the Related Art Conventionally, an oxygen ion conductor comprising a cubic zirconia molded body containing a stabilizer and an electrode has been known. However, each of them is a sintered body made of a crystal aggregate having a random crystal orientation. there were.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、このような
従来のジルコニア質酸素イオン導電体よりもさらに酸素
イオン伝導性の高い、安定化剤を含む立方晶ジルコニア
成形体と電極とからなる酸素イオン導電体の提供を目的
とするものである。SUMMARY OF THE INVENTION The present invention relates to a cubic zirconia molded article containing a stabilizer and having a higher oxygen ion conductivity than such a conventional zirconia oxygen ion conductor and comprising an electrode. It is intended to provide an ionic conductor.
【０００４】[0004]
【課題を解決するための手段】本発明者は、ジルコニア
などホタル石型結晶構造を有する結晶のイオン伝導メカ
ニズムを研究する中で以下の事実を見出だした。すなわ
ち、安定化ジルコニアなどこの構造を有する結晶では、
酸素イオンは＜１００＞方向もしくはそれと等価な方向
すなわち＜０１０＞や＜００１＞の方向または＜１１０
＞方向もしくはそれと等価な方向すなわち＜１０１＞や
＜０１１＞の方向でもっとも移動しやすくしたがって酸
素イオン伝導度が最大となり、逆に＜１１１＞方向でも
っとも移動しにくくしたがって酸素イオン伝導度が最小
となる。従来使用されたジルコニア質酸素イオン導電体
は、各方位がランダムな結晶からなるので、そのイオン
伝導度はそれらの中間の値ににとどまったのである。本
発明は、このような知見に基づいて達成された。The present inventors have found the following facts in studying the ion conduction mechanism of a crystal having a fluorite-type crystal structure such as zirconia. That is, in a crystal having this structure such as stabilized zirconia,
Oxygen ions are directed in the <100> direction or a direction equivalent thereto, that is, in the <010> or <001> direction, or in the <110> direction.
> Direction or an equivalent direction, that is, the most easily movable in the <101> or <011> direction, so that the oxygen ion conductivity is maximized. Become. The conventionally used zirconia oxygen ion conductor has a random orientation in each direction, so that the ionic conductivity has an intermediate value between them. The present invention has been achieved based on such findings.
【０００５】すなわち、本発明は、安定化剤を含む立方
晶ジルコニア成形体と電極とからなる酸素イオン導電体
において、該成形体を構成する各ジルコニア結晶の結晶
方位が実質上同一方向を向き、該結晶方位の（１００）
面もしくはそれと等価な面または（１１０）面もしくは
それと等価な面に対抗電極が設けてなるジルコニア質酸
素イオン導電体、を要旨とするものである。That is, according to the present invention, in an oxygen ion conductor comprising a cubic zirconia compact containing a stabilizer and an electrode, the crystal orientations of the zirconia crystals constituting the compact are substantially in the same direction, (100) of the crystal orientation
A zirconia-based oxygen ion conductor in which a counter electrode is provided on a plane or a plane equivalent thereto, or a (110) plane or a plane equivalent thereto.
【０００６】上記安定化剤としては、従来からジルコニ
ア焼結体の安定化剤として知られている酸化イットリウ
ムなどの希土類金属酸化物や酸化カルシウム、酸化マグ
ネシウムなどのアルカリ土金属酸化物などでよい。The stabilizer may be a rare earth metal oxide such as yttrium oxide or an alkaline earth metal oxide such as calcium oxide or magnesium oxide which is conventionally known as a stabilizer for a zirconia sintered body.
【０００７】上記立方晶ジルコニア成形体の材料として
は、単結晶または配向性を有する多結晶の焼結体を使用
すればよい。それら単結晶または焼結体から（１０
０）、（１１０）などの面に平行にブロックを切り出
し、その両側のそれぞれの面に電極を取り付けることに
よって、本発明の酸素イオン導電体を製作することがで
きる。As the material of the cubic zirconia compact, a single crystal or a polycrystalline sintered body having an orientation may be used. From these single crystals or sintered bodies (10
The oxygen ion conductor of the present invention can be manufactured by cutting out a block in parallel to the planes such as 0) and (110) and attaching electrodes to the respective surfaces on both sides thereof.
【０００８】[0008]
【発明の効果】以上説明したとおり、本発明の酸素イオ
ン導電体は、酸素イオン伝導性が高く、したがって、感
度や応答性に優れた酸素センサー、湿度センサー、ＣＯ
センサーなどの各種センサーのセンサー部に利用するこ
とができる。As described above, the oxygen ion conductor of the present invention has high oxygen ion conductivity, and therefore has excellent sensitivity and responsiveness.
It can be used for the sensor part of various sensors such as sensors.
【０００９】[0009]
【実施例】スカルメルト法によって得られたＹ２Ｏ３１
０モル％の立方晶系のジルコニア単結晶を、その方位を
Ｘ線回折によって決定し、（１００）、（１１０）およ
び（１１１）の面が出るように切断して縦１０ｍｍ×横
１０ｍｍ×厚さ１ｍｍのブロックを得た。各試料にＰｔ
ペーストで対抗電極を取り付け、複素インピーダンス法
によって、各方位での酸素イオン伝導度を温度を上昇さ
せながら測定した。比較のため同組成の粉末を配向性を
高める処置をとることなく焼結してえられた試料につい
ても同じ寸法にして同様の測定をした。EXAMPLES Y 2 O 3 1 obtained by the scalmelt method
A cubic zirconia single crystal of 0 mol% is determined by X-ray diffraction, and its orientation is determined by X-ray diffraction. A 1 mm block was obtained. Pt for each sample
A counter electrode was attached with the paste, and the oxygen ion conductivity in each direction was measured by the complex impedance method while increasing the temperature. For comparison, a sample obtained by sintering a powder of the same composition without taking measures to enhance the orientation was also measured with the same dimensions.
【００１０】得られた結果を図１に示す。図中、Ｅａは
活性化エネルギーを意味する。縦軸は酸素イオン伝導度
×測定温度の対数値、横軸は測定温度の逆数を表す。FIG. 1 shows the obtained results. In the figure, Ea means activation energy. The vertical axis represents the logarithmic value of the oxygen ion conductivity × the measurement temperature, and the horizontal axis represents the reciprocal of the measurement temperature.
【００１１】この図から明らかなように、本発明による
＜１００＞および＜１１０＞の方向の伝導度は＜１１１
＞方向のそれと比較して約２ケタ高く、従来の方位のラ
ンダムなものと比較して１ケタ高いことが分かる。As apparent from FIG. 1, the conductivity in the <100> and <110> directions according to the present invention is <111>.
It can be seen that it is about two orders of magnitude higher than that of the direction and one digit higher than that of the conventional random orientation.
【図１】実施例で得られた各試料の、各温度における酸
素イオン伝導度を示すグラフである。FIG. 1 is a graph showing the oxygen ion conductivity at each temperature of each sample obtained in an example.
Claims (1)
ルコニア成形体と電極とからなる酸素イオン導電体にお
いて、該成形体を構成する各ジルコニア結晶の結晶方位
が実質上同一方向を向き、該結晶方位の（１００）面も
しくはそれと等価な面または（１１０）面もしくはそれ
と等価な面に対抗電極が設けてなる、ジルコニア質酸素
イオン導電体。An oxygen ion conductor comprising a zirconia compact comprising a cubic single crystal containing a stabilizer and an electrode, wherein the crystal orientation of each zirconia crystal constituting the compact is substantially the same. A zirconia-based oxygen ion conductor in which a counter electrode is provided on a (100) plane or a plane equivalent to the crystal orientation, or a plane equivalent to the (110) plane, in the same direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34771391A JP3265507B2 (en) | 1991-12-04 | 1991-12-04 | Zirconia oxygen ion conductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34771391A JP3265507B2 (en) | 1991-12-04 | 1991-12-04 | Zirconia oxygen ion conductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05157725A JPH05157725A (en) | 1993-06-25 |
| JP3265507B2 true JP3265507B2 (en) | 2002-03-11 |
Family
ID=18392085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34771391A Expired - Fee Related JP3265507B2 (en) | 1991-12-04 | 1991-12-04 | Zirconia oxygen ion conductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3265507B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004244282A (en) | 2003-02-14 | 2004-09-02 | Honda Motor Co Ltd | Oxide ion conductor and its manufacturing process |
-
1991
- 1991-12-04 JP JP34771391A patent/JP3265507B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 本井康朗 他３名，電子情報通信学会技術研究報告，日本，９０巻２０５号，ｐ５１−５５ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05157725A (en) | 1993-06-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |