KARTHIK, C.; RAVISHANKAR, N.; VARMA, K. B. R.; MAGLIONE, Mario; VON DER MÜHLL, Régnault; ETOURNEAU, Jean

doi:10.1063/1.2234848

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KARTHIK, C.
Indian Institute of Science [Bangalore] [IISc Bangalore]

RAVISHANKAR, N.
Indian Institute of Science [Bangalore] [IISc Bangalore]

VARMA, K. B. R.
Indian Institute of Science [Bangalore] [IISc Bangalore]

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Applied Physics Letters. 2006, vol. 89, n° 4, p. 042905 (3 p.)

American Institute of Physics

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K0.5La0.5Bi2Nb2O9, a relaxor, was synthesized and the structural studies confirmed it to be an n=2 member of the Aurivillius oxides. The (1/2){h00} and (1/2){hk0} types of superlattice reflections in the electron diffraction patterns reflected the presence of ordered polar regions. A broad dielectric peak with frequency dependent dielectric maximum temperature was observed. The dielectric relaxation obeyed the Vogel-Fulcher relation wherein Ea=0.04 eV, Tf=428 K,and omegao=1010 Hz. The diffuseness parameter gamma=2.003 established the relaxor nature and it was attributed to the A-site cationic disorder. The piezoelectric d31 coefficient was 0.5 pC/N at 300 K and 2 pC/N at 480 K.< Réduire

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Niobates

titanates

tantalates

PZT ceramics...

Dielectric loss and relaxation

Ferroelectricity and antiferroelectricity

Piezoelectricity and electromechanical effects

Permittivity (dielectric function)

PZT ceramics

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Relaxor behavior of K0.5La0.5Bi2Nb2O9 ceramics

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