Phase equilibria, crystal growth and characterization of the novel ferroelectric tungsten bronzes Ca_xBa_1-xNb₂O₆ (CBN) and Ca_xSr_yBa_1-x-yNb₂O

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• 作者：M. Muehlberg ; M. Burianek ; B. Joschko ; D. Klimm ; A. Danilewsky ; M. Gelissen ; L. Bayarjargal ; G.P. Gö ; rler ; B.O. Hildmann
• 关键词：A1. Phase diagrams ; A1. X-ray topography ; A2. Czochralski method ; B1. Niobates ; B2. Ferroelectric materials
• 刊名：Journal of Crystal Growth
• 出版年：2008
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：April 2008
• 卷：310
• 期：7-9
• 页码：2288-2294
• 文件大小：950 K

摘要

Phase diagram analyses and crystal growth experiments of the novel ferroelectric tetragonal tungsten bronzes me="mml44">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml44&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=4ae4ca6324020bb02b301de7d69a0bbf" title="Click to view the MathML source" alt="Click to view the MathML source">Ca_xBa_1-xNb₂O₆ (calcium barium niobate, CBN) and me="mml45">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml45&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=44a6dec9be561ac49d0e15aae7f98d75" title="Click to view the MathML source" alt="Click to view the MathML source">Ca_xSr_yBa_1-x-yNb₂O₆ (calcium strontium barium niobate, CSBN) were performed in this study. The quasi-binary phase diagram me="mml46">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml46&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=2298312b252c2aa2bbe40c92850e1ee5" title="Click to view the MathML source" alt="Click to view the MathML source">BaNb₂O₆–CaNb₂O₆ was found to be similar to the related system me="mml47">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml47&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=cda2e221e25b7261f1901847720b287a" title="Click to view the MathML source" alt="Click to view the MathML source">BaNb₂O₆–SrNb₂O₆, but with a remarkably reduced existence region. In the quasi-ternary phase diagram me="mml48">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml48&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=0b256f4a9fe54ad25eacd01c129117e3" title="Click to view the MathML source" alt="Click to view the MathML source">CaNb₂O₆–SrNb₂O₆–BaNb₂O₆ the stability field of me="mml49">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml49&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=c7bd39cd07a8f1e60bcf6327763c320e" title="Click to view the MathML source" alt="Click to view the MathML source">Ca_xSr_yBa_1-x-yNb₂O₆ mixed crystals was determined by X-ray powder diffraction of sintered and annealed samples. Large, transparent, and nearly colorless CBN and CSBN single crystals of high quality were grown by the Czochralski method. The dislocation network structure of the core region in the as-grown crystals was analyzed by X-ray topography employing white beam synchrotron radiation. Precise measurements of the refractive index dispersion showed a composition dependance only for the extraordinary beam. The Curie temperature of the ferroelectric phase transition me="mml50">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml50&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=355ac6e528d00178fbaef6ea22a678e5">mg src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TJ6-4RC6RF5-6-4W/0?wchp=dGLbVzb-zSkWb" alt="View the MathML source" title="View the MathML source" align="absbottom" border="0" height=19 width="99"/> determinated by calorimetric measurements exhibited a clear composition dependance. It is expected that in the complete mixed crystal system me="mml51">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml51&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=9b31de79313cf9d0e937fc4601f93ce1" title="Click to view the MathML source" alt="Click to view the MathML source">Ca_xSr_yBa_1-x-yNb₂O₆ the Curie temperature could be varied between about me="mml52">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml52&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=758a3960c8e41c2661c44fad334ac8eb">mg src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TJ6-4RC6RF5-6-4Y/0?wchp=dGLbVzb-zSkWb" alt="View the MathML source" title="View the MathML source" align="absbottom" border="0" height=13 width="37"/> for strontium barium niobate with me="mml53">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml53&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=bb0907097571641a59c405def250edf0" title="Click to view the MathML source" alt="Click to view the MathML source">x_Sr=0.61 and about me="mml54">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml54&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=19d524503bf0000a1ce64d1a094dd44b">mg src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TJ6-4RC6RF5-6-51/0?wchp=dGLbVzb-zSkWb" alt="View the MathML source" title="View the MathML source" align="absbottom" border="0" height=13 width="45"/> for CBN with me="mml55">method=retrieve&_udi=B6TJ6-4RC6RF5-6&_mathId=mml55&_user=1067359&_cdi=5302&_rdoc=180&_acct=C000050221&_version=1&_userid=10&md5=8dce978be97c9e639976eac08f676427" title="Click to view the MathML source" alt="Click to view the MathML source">x_Ca≈0.20, the lowest possible Ca content.