Synthesis and Phase Transition of HgTiO3
Synthesis and Phase Transition of HgTiO3
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HgTiO3 的合成与相变
DOI：
10.1080/00150190600716234
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发表时间：
2006
期刊：
影响因子：
0.8
通讯作者：
L. Gauckler
中科院分区：
文献类型：
--
作者：
Y. Shan;Y. Inaguma;H. Tetsuka;Tetsuro Nakamura;L. Gauckler
以氧化汞和二氧化钛为原料，在封闭的金胶囊中，在6 GPa600℃下反应30min，合成了晶胞参数为a=5.3781，c=13.604(Z=6)的菱形变形钙钛矿型HgTiO3。在室温下用同步加速器X射线(波长=0.72000ä)研究了其晶体结构与外加压力的关系，发现当外加压力为2.3Gpa时，随着外加压力的增加，晶体的菱面体形变减小，对称性趋于立方形。在室温以上，从差示扫描量热(DSC)和介电性能的测量中观察到一些异常现象。这些结果表明，HgTiO3室温下为铁电体。
A rhomboidal distorted perovskite HgTiO 3 with the unit cell parameters a = 5.3781 Å and c = 13.604 Å (Z = 6) was synthesized under 6 GPa at 600°C for 30 minutes, using a mixture starting material HgO and TiO 2 in a closed Au-capsule. Through investigations on the relationship between its crystal structure and applied pressure by the synchrotron X-ray beam (wavelength = 0.72000 Å) at room temperature, we found a rhombohedral distortion decreased when the pressure increased and the symmetry approached to the cubic under a pressure of 2.3 GPa. Above room temperature, some abnormalities were observed from the measurements of differential scanning calorimetry (DSC) and dielectric property. These results suggested that HgTiO 3 is a ferroelectrics at room temperature.