Synthesis, Structural Characterization, and Physical Properties of the New Transition Metal Oxyselenide Ce2O2ZnSe2

被引：13

作者：

Ainsworth, Chris M. ^{[1
]}

Wang, Chun-Hai ^{[1
]}

Tucker, Matthew G. ^{[2
]}

Evans, John S. O. ^{[1
]}

机构：

[1] Univ Durham, Dept Chem, Durham DH1 3LE, England

[2] Rutherford Appleton Lab, Sci & Technol Facil Council, ISIS Neutron & Muon Source, Didcot OX11 0QX, Oxon, England

来源：

INORGANIC CHEMISTRY | 2015年 / 54卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

LAYERED SUPERCONDUCTOR; ELECTRONIC-STRUCTURES; OPTICAL-PROPERTIES; CRYSTAL-STRUCTURES; LA; BI;

D O I：

10.1021/ic502551n

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The quaternary transition metal oxyselenide Ce2O2ZnSe2 has been shown to adopt a ZrCuSiAs-related structure with Zn2+ cations in a new ordered arrangement within [ZnSe2](2) layers. The color of the compound changes as a function of cell volume, which can vary by similar to 0.4% under different synthetic conditions. At the highest, intermediate, and lowest cell volumes, the color is yellow-ochre, brown, and black, respectively. The decreased volume is attributed to oxidation of Ce from 3+ to 4+, the extent of which can be controlled by synthetic conditions. Ce2O2ZnSe2 is a semiconductor at all cell volumes with experimental optical band gaps of 2.2, 1.4, and 1.3 eV for high, intermediate, and low cell volume samples, respectively. SQUID measurements show Ce2O2ZnSe2 to be paramagnetic from 2 to 300 K with a negative Weiss temperature of theta = -10 K, suggesting weak antiferromagnetic interactions.

引用

页码：1563 / 1571

页数：9

共 29 条

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