High temperature solution growth of perovskite Pb2CoWO6 single crystals

Article Article scientifique Article High temperature solution growth of perovskite Pb2CoWO6 single crystals eng 1991 author Sun Bing Nan 43097 author Boutellier Roland 26223 author Sciau Philippe Guy Paul 41657 author Burkhardt Ernst 617845 author Rodriguez Vincent Jean-Paul 81939 author Schmid Hans 25307 71-83 0022-0248 Single crystals of Pb2CoWO6 (PCW) of sufficient size and homogeneity for optical and x-ray characterizations were grown in sealed Pt crucibles by a slow cooling method of high temp. soln. growth using PbO as flux. The best growth conditions were 1130 to 830 Deg as growth temps., (1-x)PCW + xPbO with x (in wt.%) varying from 0.35 to 0.43 as starting compns., and 0.3 to 0.4 Deg h as cooling rates. The common problem of sepg. the grown crystals from the residual flux was solved by a flux sepn. technique using a porous ceramic piece which sucked the liq. at the end of the growth process inside the sealed Pt crucible. The growth morphol. of PCW is related to the cooling rate of the growth soln. Quasi-cubic (100) crystals with small (111) faces were grown at a small cooling rate, whereas cubo-octahedral (111) + (100) crystals formed at a higher cooling rate. The PbO concn. in the starting compn. has no significant effect on the growth morphol. of PCW. Growth mechanisms are discussed according to the results of some surface micromorphol. observations. Growth spirals and growth layers were obsd. on the (100) surface, giving evidence of a layer growth mechanism. A higher cooling rate induced growth instability and brought on formation of hopper crystals which are difficult to be cut and polished into thin plate necessary for subsequent characterizations. Some results of a polarized light microscopy study of domains in transmitted light and of x-ray diffraction characterization are summarized, showing the high quality of the grown crystals. Crystal growth Crystal form Cobalt lead tungstate crystal growth Dewey 540 Swiss National Science Foundation 1990 CH 40 Département de chimie minérale, analytique et appliquée 145 false Journal of crystal growth 112 1 58eb6d2f-1a38-4a98-a3c2-5b83ef545240 Article (Published version) Restricted 124).pdf 3490598 application/pdf restrictedAccess Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée

Title	Published in	Access level	OA Policy	Year	Views	Downloads

High temperature solution growth of perovskite Pb₂CoWO₆ single crystals	Journal of crystal growth			1991	689	0

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Rodriguez, Vincent Jean-Paul