Phase transitions and dielectric properties of perovskite-type oxyfluorides (1-x)KNbO^sub 3^-xKMgF^sub 3

(1-x)KNbO3-xKMgF3 was synthesized using a sealed silica tube with an oxygen generator (KNMOF-O2) or a high-pressure and high-temperature apparatus (KNMOF-hp). The variations in phase transition temperature and dielectric properties were investigated. The temperatures of a tetragonal-to-cubic phase t...

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Bibliographic Details
Published in:Journal of fluorine chemistry 2018-05, Vol.209, p.65
Main Authors: Katsumata, Tetsuhiro, Sawada, Nobuhiro, Kuraya, Ryosuke, Hamagaki, Takuma, Aimi, Akihisa, Mori, Daisuke, Inaguma, Yoshiyuki, Wang, Ruing Ping
Format: Article
Language:English
Subjects:
Chemical synthesis
Dielectric properties
Dielectric relaxation
Electrical properties
Orthorhombic phase
Oxyfluorides
Perovskite
Perovskites
Phase transitions
Potassium niobates
Relaxors
Silica
Silicon dioxide
Temperature
Temperature dependence
Temperature effects
Transition temperature
Transition temperatures
Variation
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Summary:(1-x)KNbO3-xKMgF3 was synthesized using a sealed silica tube with an oxygen generator (KNMOF-O2) or a high-pressure and high-temperature apparatus (KNMOF-hp). The variations in phase transition temperature and dielectric properties were investigated. The temperatures of a tetragonal-to-cubic phase transition and an orthorhombic-to-tetragonal phase transition decreased with x, whereas the temperature of a rhombohedral-to-orthorhombic phase transition increased with it. The temperature variation, however, became constant for x ≥ 0.05 and did not merge into one. In the temperature dependence of dielectric permittivity for x = 0.05 (KNMOF-hp), a broad maximum was observed in the vicinity of 400 K and its value reached approximately 2200 which is higher than that of a KNbO3 dense ceramic. Considering the variation of phase transition temperatures and dielectric measurements, it is concluded that the relaxor-like behavior was realized for x = 0.05 (KNMOF-hp).
ISSN:0022-1139
1873-3328