ABDELKEFI, Helmi; KHEMAKHEM, Hamadi; SIMON, Annie; MAGLIONE, Mario

doi:10.1063/1.2818146

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ABDELKEFI, Helmi
Laboratoire des Matériaux Ferroélectriques [LMF]

KHEMAKHEM, Hamadi
Laboratoire des Matériaux Ferroélectriques [LMF]

SIMON, Annie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Applied Physics. 2007, vol. 102, n° 11, p. 114106

American Institute of Physics

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The ferroelectric, piezoelectric, and pyroelectric properties of Ba1−xNaxTi1−xNbxO3 with x=0.70 (BTNN0.70) lead-free ceramic were investigated. Polycrystalline sample with composition BTNN0.70 was prepared by using conventional dry ceramic technique. Sample was sintered at 1250 °C for 3 h under oxygen showed perovskite structure with high densities 4.92 g/cm3 (~96% as relative density). X-ray analysis confirmed the formation of single-phase compound with cubic crystal structure. Dielectric properties were studied in detail as a function of frequency and temperature. From temperature variation of dielectric constant, Curie temperature (TC) was determined. Discussion on hysteresis behavior for the sample at room temperature is presented. An essential relation between the piezoelectric properties and the ferroelectric nature of the ceramics was detected. The piezoelectric and pyroelectric coefficients of the ceramic were studied as a function of temperature.< Leer menos

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Barium compounds

Crystal structure

Dielectric hysteresis

Ferroelectric ceramics

Ferroelectric Curie temperature

Ferroelectricity

Permittivity

Piezoceramics

Piezoelectricity

Pyroelectricity

Sintering

Sodium compounds

Titanium compounds

X-ray diffraction

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