Synthesis and Characterization of Some Ternary Chalcogenides

这项建议涉及固态三元硫化物(硫化物是含有S、Se或Te的化合物)的合成和表征。如果不合成新的化合物，新的物理性质的发现就不会取得进展。虽然目前的重点是氧化物，因为在一些氧化物中发现了高超导温度，但这项提案解决了他们认为的不平衡问题，并与硫化物有关。建议研究的体系包括：(A)Nb、Ta/Pd、Pt/S、Se体系的结构化学；(B)某些层状三元硫化物的插层化学；(C)一些f电子三元硫化物的合成和物理性质；(D)新的三元碲化物的制备和性质；(E)过渡金属多硫化物的化学；和(F)在尚未研究的领域寻找新材料。这类研究的最终目标是使组成、结构和物理性能之间有足够的相关性，以便具有所需性能的新材料可以定制设计。

This proposal concerns the synthesis and characterization of solid-state ternary chalcogenides (a chalcogenide being a compound that contains S, Se, or Te). The discovery of new physical properties cannot progress if new compounds are not synthesized. While current emphasis is on the oxides, owing to the discovery of high superconducting temperatures in some oxides, this proposal addresses what they perceive to be an imbalance and is concerned with chalcogenides. Among the systems proposed for study are (a) structural chemistry in the Nb,Ta/Pd,Pt/S,Se systems; (b) intercalation chemistry of some layered ternary chalcogenides; (c) synthesis and physical properties of some f-electron ternary chalcogenides; (d) preparation and properties of new ternary tellurides; (e) chemistry of polychalcogenides of the transition metals; and (f) some searches for new materials in areas that have not been studied. The ultimate goal of such studies is a sufficient correlation of composition, structure, and physical properties so that new materials with desired properties may be custom designed.