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High temperature solution growth of perovskite Pb2CoWO6 single crystals

Published in Journal of Crystal Growth. 1991, vol. 112, no. 1, p. 71-83
Abstract 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.
Keywords Crystal growthCrystal formCobalt lead tungstate crystal growth
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Project FNS: 1990
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SUN, Bing Nan et al. High temperature solution growth of perovskite Pb2CoWO6 single crystals. In: Journal of Crystal Growth, 1991, vol. 112, n° 1, p. 71-83. https://archive-ouverte.unige.ch/unige:31413

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