Phase diagram and ferroelectric behaviors of BaTiO3 nanowires

Autor:	Jianning Ding, Jianhua Qiu, Xiu-Qin Wang, Ying Zhou, H. X. Cao, N. Y. Yuan
Rok vydání:	2011
Předmět:	Quantum phase transition Condensed Matter::Materials Science Phase transition Materials science Condensed matter physics Phase (matter) Nanowire General Physics and Astronomy Dielectric Polarization (waves) Ferroelectricity Phase diagram
Zdroj:	Journal of Applied Physics. 109:054103
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.3559810
Popis:	A modified Landau-Ginzburg-Devonshire theory is developed to investigate the “diameter-temperature” phase diagram and the ferroelectric behaviors of BaTiO3 nanowires. Four phases, such as the Cubic phase, the Tetragonallike phase, the Orthorhombic phase, and the Monoclinic phase, are obtained. The ferroelectric phase transition temperatures are all depressed as the diameter decreases. A temperature-dependent critical diameter below which the polarization disappears is 0.8 nm at 0 K. Moreover, the magnitude and the direction of the polarization are strongly dependent on the diameter as well as the dielectric behaviors. Therefore, it can generate a specific direction of the polarization by controlling the diameter of the nanowires which may optimize the physical properties.
Databáze:	OpenAIRE
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