Phase Transformation Kinetics in Ceramics: Role of Aliovalent Dopants

小行星9403591 这项工作的主要目的是研究异价掺杂剂在陶瓷相变动力学中的作用。 研究陶瓷中扩散相变的动力学，重点是掺杂剂和/或气氛，这是很重要的，原因有几个：1）相平衡的测定; 2）所需相的动力学稳定; 3)相分离形态学; 4）相变理论。 研究提出了两种类型的系统：氧化物与一个阳离子亚晶格或两个阳离子亚晶格。 通过控制相变和有序度，有可能调整扩散相变和钽酸钪钾和钽酸钪铅等材料的介电响应。 %%% 提出了一个理论和实验研究的相互扩散，重点是掺杂剂。 通过缺陷化学控制扩散系数的能力具有科学和实际意义。 ***

9403591 Virkar The principal objective of this work is to examine the role of aliovalent dopants on the kinetics of phase transformation in ceramics. A study of the kinetics of diffusional phase transformations in ceramics with emphasis on dopants and/or atmosphere, is important for several reasons: 1) determination of phase equilibria; 2) kinetic stabilization of the desired phase; 3) morphology of phase separation and 4) phase transformation theories. Research is proposed on two types of systems; oxides with one cation sublattice or two cation sublattices. By controlling the transformation and degree of order, it may be possible to tailor the diffused phase transition and the dielectric response in materials like potassium tantalate niobate and lead scandium tantalate. %%% A theoretical and experimental study of interdiffusion with emphasis on dopants is proposed. The ability to control the diffusion coefficient through defect chemistry has both scientific and practical implications. ***