Neutron diffraction study of phase transitions in perovskite-type strontium molybdate SrMoO{sub 3}

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.11.005· OSTI ID:21372475

Macquart, Rene B ^[1]; Avdeev, Maxim ^[2]

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1. School of Chemistry, University of Sydney, Sydney, NSW 2006 (Australia)
2. Bragg Institute, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234 (Australia)

The structure of a polycrystalline sample of SrMoO{sub 3} has been investigated using powder neutron diffraction from 5 to 300 K, to reveal two structural phase transitions, the first from the cubic Pm3-barm structure with a=3.97629(3) A to a tetragonal structure in I4/mcm near 266 K and the second to an orthorhombic Imma phase below 125 K. The average Mo-O distance is essentially independent of temperature. The temperature dependence of the octahedral tilting appears typical of a tricritical phase transition. - Graphical abstract: Variable temperature neutron diffraction measurements of SrMoO{sub 3} from 5 K to room temperature show the presence of two phase transitions associated with tilting of the octahedra. On cooling, the structure transforms from cubic (Pm3-barm) to tetragonal (I4/mcm) and ultimately orthorhombic (Imma).

• OSTI ID: 21372475
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 1; Other Information: DOI: 10.1016/j.jssc.2009.11.005; PII: S0022-4596(09)00518-0; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COOLING
MOLYBDATES
NEUTRON DIFFRACTION
NEUTRON TEMPERATURE
ORTHORHOMBIC LATTICES
PEROVSKITE
PHASE TRANSFORMATIONS
POLYCRYSTALS
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TETRAGONAL LATTICES
ALKALINE EARTH METAL COMPOUNDS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
MINERALS
MOLYBDENUM COMPOUNDS
OXIDE MINERALS
OXYGEN COMPOUNDS
PEROVSKITES
REFRACTORY METAL COMPOUNDS
SCATTERING
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS