Polar behavior in Mn-doped SrTiO3 ceramics
authors Tkach, A; Vilarinho, PM; Kholkin, AL
nationality International
journal APPLIED PHYSICS LETTERS
keywords SOFT PHONON MODES; DIELECTRIC-RELAXATION; PHASE-TRANSITIONS; FERROELECTRICITY; SR1-XCAXTIO3; SR1-XBAXTIO3; IONS
abstract Polar behavior was found in Sr1-xMnxTiO3(x=0.005-0.02) ceramic system. Radio-frequency dielectric measurements showed a diffuse maximum at 25-65 K shifting to higher temperatures with increasing measurement frequency and amount of Mn. The observation of hysteretic behavior in the P versus E curves shows the existence of a polar state at low temperatures. The hysteresis response slowly degenerates into just nonlinearity as the temperature increases. The observed relaxor-type dielectric behavior is attributed to the formation of electric dipoles and corresponding random fields due to the off-center position of Mn2+ ion at the Sr site of highly polarizable SrTiO3 lattice. (c) 2005 American Institute of Physics.
publisher AMER INST PHYSICS
issn 0003-6951
year published 2005
volume 86
issue 17
digital object identifier (doi) 10.1063/1.1920414
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000229185500041
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