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New Magnetic Zintl Phases in Eu-In-P System

Published online by Cambridge University Press:  01 February 2011

Jiong Jiang
Affiliation:
Departments of Chemistry, One Shields Avenue, University of California, Davis, CA 95616
Amy C. Payne
Affiliation:
Departments of Chemistry, One Shields Avenue, University of California, Davis, CA 95616
Susan M. Kauzlarich
Affiliation:
Departments of Chemistry, One Shields Avenue, University of California, Davis, CA 95616
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Abstract

Single crystals of two new compounds, Eu3InP3 and Eu3In2P4, were prepared by In flux synthesis. Eu3InP3 crystallizes in the Pnma orthorhombic space group with a = 12.6517(15) Å, b = 4.2683(5) Å, c = 13.5643(14) Å, and Z = 4 while Eu3In2P4 belongs to Pnnm space group, a = 6.6999(6) Å, b = 16.1019(13) Å, c = 4.2725(4) Å, and Z = 2. These two compounds are isotypic to the main group compounds Sr3InP3 and Sr3In2P4 respectively. Both structures consist of distorted In-P tetrahedra and isolated Eu2+ ions. In Eu3InP3 these tetrahedra share corners to form one-dimensional chains. The Eu2+ ions occupy three different sites, and form a complicated network containing some triangles. In Eu3In2P4 these tetrahedra form edge-shared dimers, and these dimers form chains. Eu3InP3 shows unusual magnetic properties: there are three magnetic ordering transitions at 14 K, 10.4 K, and around 5 K and the magnetization curve shows steps in the low temperature region. Eu3In2P4 magnetically orders at 14.5 K. Its magnetization curve saturates at around 1T. Eu3InP3 and Eu3In2P4 are both semiconductors.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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