Phase equilibria and crystal chemistry in the ternary system BaOTiO2Nb2O5, I
作者： J.M. Millet , R.S. Roth , L.D. Ettlinger , H.S. Parker
DOI: 10.1016/0022-4596(87)90362-8
关键词: Crystal structure 、 Orthorhombic crystal system 、 Monoclinic crystal system 、 Phase diagram 、 Materials science 、 Space group 、 Crystallography 、 Ternary numeral system 、 Solid solution 、 Phase (matter) 、 Mineralogy 、 Physical and Theoretical Chemistry 、 Inorganic chemistry 、 Materials Chemistry 、 Electronic, Optical and Magnetic Materials 、 Condensed matter physics 、 Ceramics and Composites
摘要: Abstract A partial subsolidus phase diagram is presented of the BaOTiO2Nb2O5 ternary system. Ten compounds or solid solutions in system are described. BaTi3Nb4O17, BaTi5Nb4O21, BaTi7Nb4O25, and BaTi9Nb4O29 belong to a chemically structurally homologous series AB2n+1O4n+5 with 3 ≦ n 6, first member which isomorphous KTi2Ta5O17. They all crystallize orthorhombic system, space group Cmcm essentially constant b parameters (a = 6.6, 8.9 A). The c parameter varies approximately linearly composition from 21.148 for BaTi3Nb4O17 34.321 BaTi9Nb4O29. BaTiNb4O13, KTa5O13, could be considered as chemical described above but it crystallizes Pbcm unit cell 5.640, 10.738, 16.488 A. nonstoichiometric close 3BaO:5TiO2:3Nb2O5 monoclinic P2 1 9.991, 9.970, 7.311 A, β 111°25′. Two other new phases extended on quasi-binary join BaTiO3Ba5Nb4O15. Ba8Ti3Nb4O24 ( Ba 8 Ti 3+ 5x 4 Nb 4−x O 24 0 x 0.7) primitive hexagonal 5.794 18.868 an incommensurate solution extends Ba5Nb4O15 end compound Ba6TiNb4O18 (Ba5+xTixNb4O15+3x 1) crystallizing rhombohedral R3m, 5.765, 42.348 three previously described, Ba3Ti4Nb4O21 (Ba3Ti4+5xNb4−4xO21 0.3), Ba6Ti2Nb8O30 (Ba6−xTi2−2xNb8+2xO30), BaTiO3 (BaTi1−5xNb4xO3 0.02) were confirmed further studied.
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