对 Ag/Pb/Sb/Se 和 Ag/Pb/Sb/Te 体系中一些无序季化合物的研究

IF 2.4 4区材料科学 Q2 CRYSTALLOGRAPHY

Crystals Pub Date : 2024-09-05 DOI:10.3390/cryst14090789

Maxim Grauer, Christopher Benndorf, Valentin Rohr, Carsten Paulmann, Oliver Oeckler

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引用次数: 0

摘要

对淬火 NaCl 型 Ag1/3Pb1/3Sb1/3Se 进行的电学和热学传输测量显示，这种 n 型半导体的塞贝克系数高达 -140 μVK-1，热导率低至 0.52 WmK-1。电子衍射图中的无序漫散射显示了短程有序性。相比之下，4L-Ag0.61Pb1.79Sb2.61Se6（空间群 Cmcm，a = 4.2129(1) Å，b = 13.852(1) Å，c = 20.866(1) Å，Z = 4）在 Ag/Pb/Sb/Se 体系中首次出现了锂辉石型结构。它由板状 NaCl 型构筑块组成，这些构筑块通过三棱 [PbSe6] 棱柱相互连接。由于此类结构通常不以 Te 作为阴离子，因此 Ag/Pb/Sb/Te 体系中的第一个 "类硫酸盐 "化合物 Ag0.38Pb0.25Sb2.38Te4 形成了层状的四钛铁矿结构（空间群 R3-m，a = 4.2887(1)埃，c = 41.544(1)埃，Z = 3）。其板块由范德华间隙分隔，由三层扭曲的 [MTe6] 八面体构成。Ag0.38Pb0.25Sb2.38Te4 晶体是通过化学传输生长的。

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Investigations of Some Disordered Quaternary Compounds in the Systems Ag/Pb/Sb/Se and Ag/Pb/Sb/Te

Electrical and thermal transport measurements on quenched NaCl-type Ag1/3Pb1/3Sb1/3Se reveal an n-type semiconductor with a Seebeck coefficient up to −140 μVK−1 and a thermal conductivity as low as 0.52 WmK−1. Short-range order is indicated by disorder diffuse scattering in electron diffraction patterns. In contrast, 4L-Ag0.61Pb1.79Sb2.61Se6 (space group Cmcm with a = 4.2129(1) Å, b = 13.852(1) Å, and c = 20.866(1) Å, Z = 4) features the first lillianite-type structure in the system Ag/Pb/Sb/Se. It consists of slab-like NaCl-type building blocks that are interconnected via trigonal [PbSe6] prisms. As such structures typically do not form with Te as an anion, the first “sulfosalt-like” compound, Ag0.38Pb0.25Sb2.38Te4, in the system Ag/Pb/Sb/Te forms a layered tetradymite-like structure (space group R3-m with a = 4.2887(1) Å, c = 41.544(1) Å, Z = 3). Its slabs, which are separated by van der Waals gaps, are built up from three layers of distorted [MTe6] octahedra. Crystals of Ag0.38Pb0.25Sb2.38Te4 were grown by chemical transport.

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来源期刊

Crystals CRYSTALLOGRAPHYMATERIALS SCIENCE, MULTIDIS-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

4.20

自引率

11.10%

发文量

1527

审稿时长

16.12 days

期刊介绍： Crystals (ISSN 2073-4352) is an open access journal that covers all aspects of crystalline material research. Crystals can act as a reference, and as a publication resource, to the community. It publishes reviews, regular research articles, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on article length. Full experimental details must be provided to enable the results to be reproduced. Crystals provides a forum for the advancement of our understanding of the nucleation, growth, processing, and characterization of crystalline materials. Their mechanical, chemical, electronic, magnetic, and optical properties, and their diverse applications, are all considered to be of importance.