Polymorphism and Dielectric Properties of Nb-Doped BaTiO3
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http://dx.doi.org/10.1111/j.1551-2916.2007.02083.x |
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Títol
Polymorphism and Dielectric Properties of Nb-Doped BaTiO3Data de publicació
2008-01Editor
WileyISSN
0002-7820Cita bibliogràfica
Journal of the American Ceramic Society, 91, 1, p. 144-150Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://onlinelibrary.wiley.com/doi/10.1111/j.1551-2916.2007.02083.x/abstractParaules clau / Matèries
Resum
A working subsolidus phase diagram for the system BaTiO3–Ba5Nb4O15 has been determined by firing sol–gel-synthesized samples over a range of temperatures. The main difference from previous diagrams is the greater ... [+]
A working subsolidus phase diagram for the system BaTiO3–Ba5Nb4O15 has been determined by firing sol–gel-synthesized samples over a range of temperatures. The main difference from previous diagrams is the greater extent of the Nb-doped BaTiO3 cubic solid solutions, BaTi1−5xNb4xO3, at lower temperatures with x extending to 0.09 at 900°C, but only 0.05 at 1400°C. Electrical property measurements show that compositions with large x (x≥0.0025) are highly insulating for pellets sintered at 1300°C in air, followed by a slow cool. Compositions with low x, however, exhibit a residual semiconducting grain core and are not fully reoxidized readily. Composition dependence of the dielectric properties shows a continuous and smooth transition from classic ferroelectric behavior with pure BaTiO3 to normal dielectric response with a temperature-independent relative permittivity of approximately 22–24 for x>∼0.08. At intermediate compositions, ranges of both relaxor ferroelectric and quasi-ferroelectric behavior are observed. Possible reasons for an observed anomalous increase in value of the permittivity at the ferroelectric transition temperature at low x, which is superposed on an overall decrease in permittivity with increasing x, are discussed. [-]
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(c) 2007 The American Ceramic Society
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