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．
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.
参考文献
| [1] | Austin A E, Schwautz C M. Acta Cryst., 1953， 6: 812--813. [2] Bayer G. J. Less-common Metals, 1971, 24: 129--138. [3] Morosin B, Lynch R W. Acta Cryst., 1972, B28: 1040--1046. [4] JCPDS X-ray Powder Diffraction File, 1973. 26--40. [5] JCPDS X-ray Powder Diffraction File, 1991. 41--258. [6] ISHITSUKA M, et al. J. Am. Ceram. Soc., 1987, 70: 69--71. [7] 浜野健也等. 神奈川大学工学研究所所报, 第16号, 1993年12月. 67--70. [8] YANO T, et al. J. Ceram. Soc. Japan, 1986, 94: 44--48. [9] PENA P, et al. Science of Ceramics, 1988, 14: 751--756. [10] 浜野健也. 耐火物, 1975, 27: 520--527. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%