Issue 2, 2017

Crystal structure, electronic structure and physical properties of the new quaternary chalcogenides Tl2NdAg3Se4 and Tl2NdAg3Te4

Abstract

The chalcogenides Tl2NdAg3Q4 (Q = Se, Te) were prepared by heating the elements in stoichiometric ratios under exclusion of air between 973 K and 1073 K. Both compounds adopt new structure types, with Tl2NdAg3Se4 crystallizing in the space group Pnma with a = 15.9937(14) Å, b = 4.3420(4) Å, c = 14.3676(12) Å, V = 997.75(15) Å3, Z = 4, while Tl2NdAg3−xTe4 adopts a different structure with related motifs, crystallizing in the noncentrosymmetric space group Cmc21 with a = 4.5968(2) Å, b = 16.8620(6) Å, c = 44.7131(15) Å, V = 3465.8(2) Å3, Z = 12, when x = 0.05. In both cases, linear chains of [AgQ4] tetrahedra are interconnected via common corners and edges to build a three-dimensional network, which encompasses the Tl and Nd atoms in linear channels. The differences lie in their three-dimensional connection, resulting in a larger, noncentrosymmetric unit cell of the telluride. Electronic structure calculations indicate semiconducting properties, in accord with the transport property measurements in both cases. A special feature of both materials is the extraordinarily low thermal conductivity.

Graphical abstract: Crystal structure, electronic structure and physical properties of the new quaternary chalcogenides Tl2NdAg3Se4 and Tl2NdAg3Te4

Supplementary files

Article information

Article type
Research Article
Submitted
18 окт. 2016
Accepted
14 дек. 2016
First published
15 дек. 2016

Inorg. Chem. Front., 2017,4, 315-323

Crystal structure, electronic structure and physical properties of the new quaternary chalcogenides Tl2NdAg3Se4 and Tl2NdAg3Te4

A. Assoud, Q. Guo, C. R. Sankar and H. Kleinke, Inorg. Chem. Front., 2017, 4, 315 DOI: 10.1039/C6QI00436A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements