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New Quaternary Selenoantimonates AHgSbSe3 (A = Rb, Cs): Synthesis, Structures and Optical Properties

Published online by Cambridge University Press:  16 February 2011

Zhen Chen ,
Ru-Ji Wang  and
Jing Li
Zhen Chen
Affiliation:
Department of Chemistry, Rutgers University, Camden, NJ 08102, [email protected]
Ru-Ji Wang
Affiliation:
Department of Chemistry, Rutgers University, Camden, NJ 08102, [email protected]
Jing Li
Affiliation:
Department of Chemistry, Rutgers University, Camden, NJ 08102, [email protected]
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Abstract

Solvothermal reactions in ethylenediamine have resulted in two quaternary mercury containing selenoantimonates: RbHgSbSe3 (I) and CsHgSbSe3 (II). Compound I crystallizes in monoclinic system, space group P2l/c (no. 14) with a = 7.758(2)Å, b = 11.234(2)Å, c = 8.849(2) Å, β = 106.60(3)°, V = 739.1(3)Å3, Z = 4. Compound II crystallizes in orthorhombic system, space group Cmcm (no. 63) with a = 4.444(1)Å, b = 15.514(6)Å, c = 11.261(7) Å, V = 776.4(6) Å3, Z = 4. Both compounds are layered materials and their crystal structures are closely related. Both contain layers of 2[HgSbSe3-] separated by alkali-metal cations A+ (Rb, Cs). Diffuse reflectance experiments show that both compounds are semiconductors with estimated band gaps of 1.7 eV for I and 1.6 eV for II, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 419
Copyright
Copyright © Materials Research Society 1999

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