晶格常数的变化对钛酸铝热稳定性的影响

无机材料学报

晶格常数的变化对钛酸铝热稳定性的影响

江伟辉¹; 肖兴成¹; 周健儿²; 马光华²; 顾幸勇²; 胡行方¹

1. 中国科学院上海硅酸盐研究所, 上海 200050; 2. 景德镇陶瓷学院材料工程系, 景德镇 333001

收稿日期:1999-02-08 修回日期:1999-03-18 出版日期:2000-02-20 网络出版日期:2000-02-20

Effect of Variation of Lattice Constants on the Thermal Stability of Aluminium Titanate

JIANG Wei-Hui¹; XIAO Xing-Cheng¹; ZHOU Jian-Er²; MA Guang-Hua²; GU Xing-YOng²; HU Xing-Fang¹

1.Shanghai Institute of Ceramics Chinese Academy of sciences; Shanghai 200050; China; 2.JingdezhenCeramic Institute Jingdezhen; Jiangxi 333001; China

Received:1999-02-08 Revised:1999-03-18 Published:2000-02-20 Online:2000-02-20

摘要/Abstract

摘要： 深入研究了晶格常数的变化和钛酸铝热稳定性的关系．通过仔细分析钛酸铝的晶格常数随温度变化的特点，发现钛酸铝的晶格常数Ｃ随温度升高而降低这一反常现象．提出了钛酸铝的稳定性与其晶格常数Ｃ的大小密切相关的论点．在钛酸铝中引入多种添加剂以改变其晶格常数．结果发现晶格常数Ｃ的大小反映了钛酸铝的稳定性．晶格常数Ｃ越大，钛酸铝就越稳定.钛酸铝稳定性提高的原因是：晶格常数ｃ对应于钛酸铝晶体结构中畸变的［ＭｅＯ₆］八面体的高度，Ｃ值增大导致八面体的畸变程度降低，结果就使得钛酸铝更稳定．还研究了不同烧成工艺对钛酸铝的晶格常数和稳定性的影响,结果发现：随着烧成温度的提高和保温时间的延长，钛酸铝的晶格常数Ｃ增大，其稳定性也相应提高．

关键词: 钛酸铝, 热稳定性, 热分解, 晶格常数

Abstract: The relationship was investigated between lattice constants and thermal stability of
aluminium titanate (Al₂TiO₅). Through studying the variation of lattice constants of Al₂TiO₅ with temperature, the authors discovered an abnormal
phenomenon that lattice constant c of Al₂TiO₅ decreases with the increase of temperature. The authors proposed that the thermal stability of
Al₂TiO₅ is closely related to its lattice constant c. Different additives were added to Al₂TiO₅ to change its lattice constants.
The stability of Al₂TiO₅ can be reflected by its lattice constant c. The larger lattice constant c, the more stable aluminium titanate. Lattice constant c corresponds to the height of the
distorted [MeO₆] octahedra in the crystal structure of Al₂TiO₅ and its increase will lead to a reduction of distortion of the octahedra,
so that the stability of Al₂TiO₅ is improved. The effect of firing process on lattice constants and stability of Al₂TiO₅ was also explored.
The result shows that with increase of firing temperature and extension of soaking time, aluminium titanate exhibits larger lattice constant c and its
stability increases correspondingly.

Key words: aluminum titanate, thermal stability, thermal decomposition, lattice constants

中图分类号:

TQ133

江伟辉,肖兴成,周健儿,马光华,顾幸勇,胡行方. 晶格常数的变化对钛酸铝热稳定性的影响[J]. 无机材料学报.

JIANG Wei-Hui,XIAO Xing-Cheng,ZHOU Jian-Er,MA Guang-Hua,GU Xing-YOng,HU Xing-Fang. Effect of Variation of Lattice Constants on the Thermal Stability of Aluminium Titanate[J]. Journal of Inorganic Materials.

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