Monoclinic–tetragonal phase transition in zirconia: mechanism, pretransformation and coexistence
Monoclinic–tetragonal phase transition in zirconia: mechanism, pretransformation and coexistence
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DOI：
10.1107/s0567739470001389
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发表时间：
1970-09
期刊：
影响因子：
--
通讯作者：
R. Patil;E. Subbarao
中科院分区：
文献类型：
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作者：
R. Patil;E. Subbarao
高温x射线衍射研究表明，ZrO2的单斜四方相变分布在930 ~ 1220℃的温度范围内。相变前在930 ~ 1100℃区域出现了异常的强度变化。讨论了在1100 ~ 1220℃范围内形成杂化晶的相共存和转变机理。单斜(m)和四方(t)晶体结构之间的取向关系在于（100）m平面与（110）t平面的平行度以及bm轴与ct轴的平行度。在四方-单斜转变过程中，小温度范围内的剧烈变化被解释为短期和长期相互作用的合作变化。大的热滞后是由于加热和冷却过程中转变机制的不同。
The high temperature X-ray diffraction study of the monoclinic tetragonal phase transition in ZrO2 showed that it is spread over a temperature range 930–1220°C. Anomalous intensity changes are observed in the pretransformation region 930–1100°C. Coexistence of phases through hybrid crystal formation in the region 1100–1220 °C and the mechanism of transition are discussed. The orientation relationship between the monoclinic (m) and the tetragonal (t) crystal structures consists in the parallelism of the (100)m plane to (110)t and of the bm axis to the ct axis. A drastic change in a small temperature range during the tetragonal–monoclinic transition is interpreted as a cooperative change in both short and long range interactions. The large thermal hysteresis is attributed to the difference in the mechanism of transition during heating and cooling.