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Title: Structural and magnetic properties in the polymorphs of CeRh{sub 0.5}Ge{sub 1.5}

We investigate the structural and magnetic properties in the polymorphs of a new compound CeRh{sub 0.5}Ge{sub 1.5}. Depending upon the starting materials, and the slightly different synthesis method, we find that CeRh{sub 0.5}Ge{sub 1.5} compound exists in two different space groups. The first compound, α-CeRh{sub 0.5}Ge{sub 1.5} crystallizes in tetragonal α-ThSi{sub 2} structure type in space group I4{sub 1}/amd with lattice parameters, a=4.2034(6) Å and c=14.770(3) Å. In this structure, the cerium atoms occupy the position between the Rh/Ge tetrahedral layers. On the other hand, the second compound, namely β-CeRh{sub 0.5}Ge{sub 1.5} crystallizes in the AlB{sub 2} type hexagonal structure in space group P6/mmm, with lattice parameters, a=4.2615(7) Å and c=4.1813(9) Å. The crystal structure of β-CeRh{sub 0.5}Ge{sub 1.5} consists of two dimensional Rh/Ge hexagonal units and the cerium atoms are sandwiched between them. Magnetization studies exhibit magnetic ordering, as evident from a sharp peak in the plot of magnetic susceptibility measured as a function of temperature in a fixed magnetic field, in α-CeRh{sub 0.5}Ge{sub 1.5} and β-CeRh{sub 0.5}Ge{sub 1.5} at 3.6 K and 12 K, respectively. Structural and magnetic properties of both compounds are presented and discussed here. - Graphical abstract: Two polymorphs of a new compound CeRh{sub 0.5}Ge{submore » 1.5} in the α-ThSi{sub 2} and AlB{sub 2} structure types were synthesized by arc melting. The magnetic measurements of both CeRh{sub 0.5}Ge{sub 1.5} phases suggest spin-glass behavior. - Highlights: • A new compound CeRh{sub 0.5}Ge{sub 1.5} in two difference phases was synthesized by arc melting. • The crystal structure of both compounds was determined from the single crystal XRD. • Isothermal relaxation measurements suggesting spin-glass like anomalies in both phases.« less
Authors:
;  [1] ;  [2] ;  [1]
  1. New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064 (India)
  2. UGC-DAE Consortium for Scientific Research, R-5 Shed, B.A.R.C Campus, Trombay, Mumbai-400085 (India)
Publication Date:
OSTI Identifier:
22334166
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 212; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; HEXAGONAL LATTICES; LATTICE PARAMETERS; MAGNETIC FIELDS; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MONOCRYSTALS; SPACE GROUPS; SPIN GLASS STATE; SYNTHESIS; TEMPERATURE DEPENDENCE; TETRAGONAL LATTICES; X-RAY DIFFRACTION