Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 260, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2020.124111
Keywords
Scheelite; Wulfenite; Crystal structure; Neutron diffraction; Thermal expansion; Cryogenic; Phase transition
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The crystal structure of PbMoO4 undergoes anisotropic expansion from 5 to 300 K, with no structural transition observed in the temperature range. The expansion of unit cell volume is mainly attributed to the expansion of PbO8 bisdisphenoids, while the MoO4 tetrahedra act as rigid units. The smooth variation of anisotropic displacement parameters with temperature suggests PbMoO4 as a promising material for cryogenic applications.
Evolution of crystal structure of PbMoO4 (Wulfenite, tetragonal, I4(1)/a) from 5 to 300 K by in situ low temperature powder neutron diffraction studies is reported. The study revealed no structural transition in the complete range of temperature. The unit cell parameters show anisotropic expansion with about 2.2 times higher expansion along c-axis compared to that along a-axis. From the refined structural parameters, it is emphasized that the expansion of Pb-O bonds in PbO8 (bisdisphenoid) units and their orientations along a- and c-axes are the controlling factors. The MoO4 tetrahedra behaves like a rigid unit in the temperature range of this study. The expansion of unit cell volume is fully arising from the expansion of PbO8 bisdisphenoids. The analyses of anisotropic displacement parameters also show almost smooth variation with temperature down to 5 K. The evolutions of structural parameters of PbMoO4 with temperature suggest it for a promising material for cryogenic applications.
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