STUDIES ON PHASE DIAGRAM AND TRANSFORMATION IN THIN FILMS OF ZIRCONIA ALLOYS

Zirconia从高到低的Temperatures的立方体、三角形和单克隆阶段的聚合物。当它与Yttria、Lime或Magnesia一致时，高质量阶段是由Introduced Oxygen Vacances稳定的。这就是为什么Zirconia是由Cerium在同一个Valence的Spite OF THE Same Valence（Zirconium）稳定的原因。《The Present Investigation Consixt OF Two Parts AS Folows》（1）Zirconia的相位Diagram：Ceria系统是决定的实验。The Arcmeled Low Celia Alloys是一种带有扭曲相位的转换双胞胎和域就像Low Ytria Alloy，但Coherent Precipitation得到了空间在螺旋式解体的阶梯上。（2）Zirconia Alloys的瘦电影从2到8摩尔%通过RF-Sputtering的方式准备。谷物的大小大约是20米。在2和2.5摩尔%的伊特里亚合金通过衰老在200 ° C时转换成单克隆相位，但库比克相位可以稳定到这一年龄。

ZIRCONIA HAS POLYMORPHS OF CUBIC, TETRAGONAL AND MONOCLINIC PHASES FROM HIGH TO LOW TEMPERATURES. WHEN IT IS ALLOYED WITH YTTRIA, LIME OR MAGNESIA, THE HIGH TEMPERATURE PHASES ARE STABILIZED BY THE INTRODUCED OXYGEN VACANCIES. IT IS INTERESTING THAT ZIRCONIA IS STABILIZED BY CERIUM IN SPITE OF THE SAME VALENCE AS ZIRCONIUM. THE PRESENT INVESTIGATION CONSISTS OF TWO PARTS AS FOLLOWS. (1) THE PHASE DIAGRAM OF ZIRCONIA-CERIA SYSTEM WAS DECIDED EXPERIMENTALLY. THE ARCMELTED LOW CERIA ALLOYS WAS TETRAGONAL PHASE CONTAINING TRANSFORMATION TWINS AND DOMAINS LIKE LOW YTTRIA ALLOY, BUT COHERENT PRECIPITATION TAKES PLACE IN THE STEAD OF SPINODAL DECOMPOSITION. (2) THIN FILMS OF ZIRCONIA ALLOYS CONTAINING YTTRIA FROM 2 TO 8 MOL% WERE PREPARED BY MEANS OF RF-SPUTTERING. THE GRAIN SIZE WAS ABOUT 20 NM. THE TETRAGONAL PHASE IN 2 AND 2.5 MOL% YTTRIA ALLOYS WAS TRANSFORMED TO MONOCLINIC PHASE BY AGING AT 200 ゜C AGING, BUT CUBIC PHASE WAS STABLE TO THIS AGING.