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

Potassium tellurite K_2TeO_3通过对非电常数的测量发现了一种新的铁电极学。它被发现是一种新的铁电钾tellurite undergoes成功的相位转换。在偏振显微镜下的单晶体铁电陶瓷探测器的域结构，在房间温度下观察到。不规则的条纹图案在（ab）-平面上可见。一张脸覆盖了类似于规模的模式。Potassium Tellurite Shows Successive Phase Transitions。这是一种类似于荧光硫酸铵（NH_4）_2BeF_4和硒铵（K_2SeO_4）的行为。“Potassium Tellurite的transiton温度相对高于那些晶体。”然后，我们调查了铁电在宽温度范围内的差异，如微观观测结果所示，在氨基硫酸盐表面上的域运动，（NH_4）_2SO_4，单晶体被检测到有数量的运动。在（NH_4）_2BeF_4和K_2SeO_4 crystals中的不稳定阶段中的回报没有变化。从K_2TeO_3中找到了K_2TeO_5、3H_2O中的单个晶体。“对Potassium Tellurite表面的修改是由效应引起的。”

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.