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- W4285276925 endingPage "240" @default.
- W4285276925 startingPage "181" @default.
- W4285276925 abstract "Research on pyrochlore materials has seen a dramatic surge, with a major increase in the number of research articles over the last 20 years. The main reason for such attention is the ever-evolving exploration of properties (and possible applications) for these systems. Pyrochlores are no longer limited to a suitable host material for nuclear waste encapsulations. These new applications (and their promise) are linked with the new pyrochlore systems discovered almost every day. In many cases, the voluminous pyrochlore lattices (and associated defects) provide the options to obtain such structures via defect engineering. Unfortunately, the synthesis complexities are also associated with this same condition. The empty spaces (in an apparently big pyrochlore lattice) along with the linked defects make the synthesis and processing of pyrochlores very difficult; compositional inhomogeneity, unwanted phase segregations etc. are such attributes causing this difficulty. While the synthesis (of pyrochlore nanoparticles, powders, etc.) are recognized to have such issues, the processing and densification (of a bulk ceramic) steps are complicated due to many issues. A vast majority of these pyrochlore compositions are known for very low thermal conductivity. This makes the heat transfer issues (e.g., solid-state diffusion during sintering) difficult for obtaining a dense pyrochlore ceramic. It is noteworthy that this type of dense ceramic is a crucial requirement for many structural/functional applications. This chapter focuses on such process-structure issues in A2B2O7 pyrochlores, in nanoparticle, powder, and ceramic forms. Major emphasis is placed on the zirconate pyrochlores. Notable pyrochlores involving hafnate, stannate, iridate pyrochlores along with other relevant systems are also discussed. The interdependence of the radius ratios (of A and B cations) with phase stability (e.g., fluorite, defect fluorite, etc.) are highlighted. Sintering resistance of pyrochlores are discussed for their importance in coating applications. Novel (and emerging) high-entropy pyrochlore systems are discussed as an advantageous case of defect engineering (in A2B2O7 systems)." @default.
- W4285276925 created "2022-07-14" @default.
- W4285276925 creator A5038570521 @default.
- W4285276925 creator A5070643048 @default.
- W4285276925 date "2022-01-01" @default.
- W4285276925 modified "2023-09-27" @default.
- W4285276925 title "Process-structure correlations in complex A2B2O7 systems: Nanoparticles and ceramics" @default.
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