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- W1969970036 abstract "Temperature-dependent structural phase transitions and dielectric properties for a series of $x{text{Na}}_{0.5}{text{Bi}}_{0.5}{text{TiO}}_{3}text{ensuremath{-}}(1ensuremath{-}x){text{BaTiO}}_{3}$ (NBT-BT) samples where $x$ ranges from 0.05 to 0.30 have been investigated. Non-ambient x-ray diffraction together with dielectric data as a function of temperature have demonstrated an enhancement in the ferroelectric to paraelectric phase transition temperature with the increase in NBT content, including inhibition of two well-known low-temperature polymorphic phase transitions of ${text{BaTiO}}_{3}$. Anomalous dielectric response has been observed for samples with $xensuremath{ge}0.20$ suggesting a crossover from a first-order to a second-order phase transition. The critical point lies between $x=0.15$ and $x=0.20$. Deviation from the classical Curie-Weiss law has been seen for samples having $xensuremath{ge}0.10$. A modified Curie-Weiss law was employed to model the dielectric response in the paraelectric phase and the maximum value of the critical exponent $ensuremath{gamma}$ was found to be 1.45 for $x=0.30$. It is suggested that the dielectric properties are heavily influenced by the induced strain upon doping rather than chemical inhomogeneities and structural disorder, which are common occurrences in doped ferroelectrics." @default.
- W1969970036 created "2016-06-24" @default.
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- W1969970036 date "2010-12-10" @default.
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- W1969970036 title "Anomalous phase transitions of lead-free piezoelectric<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>x</mml:mi><mml:msub><mml:mrow><mml:mtext>Na</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Bi</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>TiO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:mtext>−</mml:mtext><mml:mrow><mml:mo…" @default.
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- W1969970036 doi "https://doi.org/10.1103/physrevb.82.224105" @default.
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