کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1332720 | 979052 | 2008 | 6 صفحه PDF | دانلود رایگان |
Reinvestigation of PbBiOXO4 (X=V, P, As) thermal behaviour revealed a phase transition for V- and P-compounds, but no transition for the As-compound. As shown by single-crystal X-ray diffraction and high-resolution neutron powder diffraction, α-PbBiOVO4 transforms to β-PbBiOVO4 at 550 °C. The two PbBiOPO4 varieties are isomorph to the vanadate forms, while PbBiOAsO4 adopts the β-type structure whatever the temperature. PbBiP1−xOAsxO4 and PbBiV1−xOMxO4 (M=As, P, Cr, Mn) solid solutions display both triclinic and monoclinic domains, and the α→β transition temperature is a function of the substitution rate. The ionic conductivity of these compounds was investigated by impedance spectroscopy. The analysis of free space in the β-PbBiOVO4 structure allows to propose a one-dimensional oxygen diffusion pathway along [010] when the temperature increases.
α→β PbBiOV1−xAsxO4 composition dependence.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 181, Issue 9, September 2008, Pages 2268–2273