期刊
JOURNAL OF CRYSTAL GROWTH
卷 310, 期 10, 页码 2649-2658出版社
ELSEVIER
DOI: 10.1016/j.jcrysgro.2008.01.019
关键词
crystal structure; phase diagrams; substrates; Czochralski method; perovskites; rare-earth compounds
Rare-earth (RE) scandate single crystals ranging from NdScO3 to DyScO3 were grown by the conventional Czochralski technique. The crystals were found to have a non-stoichiometric composition caused by RE-deficiency on the A-site of the distorted perovskite structure. Their pseudocubic lattice constants lie between 3.95 and 4.01 angstrom and their average thermal expansion coefficients are between 8.2 x 10(-6) and 10.9 x 10(-6) K-1. The pseudocubic lattice constants of the RE scandates vary in about 0.01 angstrom steps as the RE series is traversed, enabling the growth of substrates appropriate for the strain engineering of perovskite thin films. The crystalline perfection and homogeneity of the DyScO3 and GdScO3 single crystals are characterized by a full-width at half-maximum of the 220 reflection of the substrates of about 20-25 arcsec in omega and a very small fluctuation margin of about +/-3 arcsec over the whole wafer surface. The average dislocation density of the RE scandate crystals was 10(3)-10(5) cm(-2). These characteristics make RE scandate single crystals some of the best available substrates for the epitaxial growth of perovskite thin films. (C) 2008 Elsevier B.V. All rights reserved.
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