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

JIANG Wei-Hui; XIAO Xing-Cheng; ZHOU Jian-Er; MA Guang-Hua;GU Xing-YOng; HU Xing-Fang( Shanghai Institute of Ceramics Chinese Academy of sciences, Shanghai 200050, China; JingdezhenCeramic Institute Jingdezhen, Jiangxi 333001, China)  
The relationship was investigated between lattice constants and thermal stability ofaluminium titanate (Al_2TiO_5). Through studying the variation of lattice constants of Al_2TiO_5 withtemperature, the authors discovered am abnormal phenomenon that lattice constant c of Al_2TiO_5decreases with the increase of temperature. The authors proposed that the thermal stability ofAl_2TiO_5 is closely related to its lattice constant c. Different additives were added to Al_2TiO_5 tochange its lattice constants. The stability of Al_2TiO_5 can be reflected by its lattice constant c.The larger lattice constant of the more stable aluminium titanate. Lattice constant c correspondsto the height of the distorted [MeO_6] octahedra in the crystal structure of Al_2TiO_5 and its increasewill lead to a reduction of distortion of the octahedra, so that the stability of Al_2TiO_5 is improved.The effect of firing process on lattice constants and stability of Al_2TiO_5 was also explored. Theresult shows that with increase of firing temperature and extension of soaking time, aluminiumtitanate exhibits larger lattice constant c and its stability increases correspondingly.
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