書誌事項
- タイトル別名
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- Microstructures of Pb(Mg1/3Nb2/3)O3 and Pb(Zn1/3Nb2/3)O3 complex perovskite structure.
- Pb Mg1 3Nb2 3 O3 フクゴウ ペロブスカイト ノ ゴウセイ オヨ
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説明
Microstructures of Pb(Mg1/3Nb2/3)O3 ceramics were studied by using a x-ray analysis and transmission electron microscope (TEM) with energy dispersive x-ray analysis (EDX). In general, perovskite phase of Pb(Mg1/3Nb2/3)O3 is prepared by four different techniques: Conventional sintering (CS), Presintering (PS), CS with excess MgO (CSE), and PS with excess MgO (PSE). At the low sintering temperature of 850°C in the CS method, pyrochrore phase was located in the triple junctions and surrounded by the amorphous PbO. With increasing the sintering temperature to 900°C, pyrochrore phases were reduced and many MgO particles were observed near the pyrochrore phases. From these experimental results, the synthesis process of single phase of Pb(Mg1/3Nb2/3)O3 was classified into three parts; firstly, PbO among PbO, Nb205 and MgO powders melt and reacted with Nb2O5. The pyrochrore phases were composed at the low sintering temperature. Secondly, the pyrochrore phases gradually transformed into perovskite phases by the diffusion of MgO. The chemical composition of pyrochrore phase in the sample sintered at sintering conditions of 850°C for 2 hrs was Pb2.25(Mg0.27Nb1.79)O3. Thirdly, the single phase of Pb (Mg1/3Nb2/3)O3 perovskite was composed at the more higher sintering temperature by the mutual diffusion of excess Pb and Nb and Mg which are deficient in the pyrochrore phase.
収録刊行物
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- 粉体および粉末冶金
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粉体および粉末冶金 34 (7), 291-295, 1987
一般社団法人 粉体粉末冶金協会
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詳細情報 詳細情報について
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- CRID
- 1390282681283991552
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- NII論文ID
- 130000813137
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- NII書誌ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL書誌ID
- 3156368
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可