Phase equilibrium and transition of ZrO2 ceramics

关于ZrO2基陶瓷的c-t转变机理有两种完全不同的解释。一种是Heuer教授提出的，过渡是由一阶类型引起的；另一种是作者提出的，是第二类型。自1992年作者在澳大利亚召开的ZrO2国际会议上受邀报告以来，第一解释在ZrO2陶瓷领域流行起来。在这次会议上，作者澄清了许多实验结果不能从转变为第一型的立场来解释，并证实将转变视为二阶型是不矛盾的。而且作者明确了各种实验结果都是由萤石晶格结构中的氧空位引起的。当氧离子由于氧空位的引入而从萤石结构中的理想位置移动时，存在这种转变类型被误认为是第一类型的可能性。

There is two totally different interpretation about the mechanism of the c-t transition of ZrO2 based ceramics. One, which is proposed by Prof.Heuer, is that the transition is resulted from the first order type and the other, which is proposed by the author, is second type. The first interpretation has been popular in the field of ZrO2 ceramics since the author's invited presentation at the international conference of ZrO2 held in Australia on 1992. At this conference the author has cleared up that many experimental results can not be interpretated from the standing point that the transition is the first type and has confirmed that there is no contradictions when that transition is thought to be second order type. Moreover the author has made clear that various experimental results are resulted from the vacancies of oxygen in the fluorite lattice structure. When the oxygen ions move from the idea position in the fluorite structure by the introduction of the oxygen vacancies, there is the possibility that the type of this transition is mistaken for the first type.