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The Surface Structure of Ferroelectric Crystal like a Ammonium Sulfate Type crystals.

铁电晶体的表面结构，如硫酸铵型晶体。

基本信息

批准号：
11650689
负责人：
MATSUKI Kiyoshi
金额：
$ 2.24万
依托单位：
Hokkaido University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

Potassium tellurite K_2TeO_3 was found a new ferroeclectics by the measurements of dielectric constants. It was found that a new ferroelectric potassium tellurite undergoes successive phase transitions. The domain structure of the single crystal of ferroelectric potassium tellurite under the polarizing microscope, was observed at room temperature. The irregular stripe pattern was observed in (ab)-plane. The a-face is covered with the scale-like patterns. Potassium tellurite shows successive phase transitions. This was a similar behavior with ammomium fluoroberyllate, (NH_4)_2BeF_4, and potassium selenate, K_2SeO_4. The transiton temperature of potassium tellurite is relatively higher than those crystals. Then we investigated to clearfy the difference in ferroelectricity between these substances by the microscopic observation under wide temperature range.The domain movement on the surface in ammonium sulfate,(NH_4)_2SO_4, single crystal is detected with the movement of the baundary of the retardation. There is no change for the retardation in immcomensurate phase in (NH_4)_2BeF_4 and K_2SeO_4 crystals. The single crystal which were grown by the slow evaporation from an aqueous solutioon of K_2TeO_3 was found a K_2Te_2O_5・ 3H_2O by X-ray single crystal diffraction. The modification on the surface in potassium tellurite was caused by the efflorescence.

通过介电常数的测定，发现了一种新的铁试剂亚碲酸钾K2TeO_3。发现一种新的铁电亚碲酸钾经历了连续的相变。在室温下，用偏光显微镜观察了亚碲酸钾铁电单晶的磁区结构。在(Ab)面上观察到不规则的条纹。A脸上覆盖着鳞片状的图案。亚碲酸钾表现出连续的相变。氟铍酸铵(NH_4)_2BeF_4和亚硒酸钾K_2SeO_4也有类似的行为。亚碲酸钾的转变温度相对较高。在较宽的温度范围内，通过显微镜观察，明确了这些物质之间的铁电性差异。在(NH_4)_2SO_4单晶中，随着阻滞剂基团的移动，检测到了单晶表面的磁畴移动。在(NH_4)_2BeF_4和K_2SeO_4晶体中，无量度相的延迟没有变化。从K_2TeO_3水溶液中缓慢蒸发生长的单晶经X-射线单晶衍射确定为K_2Te_2O_5·3H_2O。亚碲酸钾的表面改性是由风化引起的。