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KMID : 0381919980280030415
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Korean Journal of Microscopy
1998 Volume.28 No. 3 p.415 ~ p.424
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Dependency of Long-range Order Parameter on the Ordered Structure of $Pb(Mg_{1/3}Nb_{2/3})O_3$ Solid Solutions
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Park Kyeong-Soon
Kim Jwa-Yeon
Lee Jae-Won
Kim Kwang-Bae
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Abstract
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The dependency of long-range order parameter on the ordered structure of $Pb(Mg_{1/3}Nb_{2/3})O_3$ solid solutions has been investigated by means of computer simulations of high-resolution lattice images. The computer image simulations were performed by the multislice method in a wide range of sample thicknesses, defocusing values, and long-range order parameters. It was found that the lattice images of the ordered structures were predominantly dependent on the long-range order parameter, The lattice images in a complete ordered structure showed a pseudo-hexagonal pattern. As the order parameter decreases, the simulated images changed slowly from a pseudo-hexagonal pattern to a rectangular pattern. The lattice images in a complete disordered structure showed a rectangular pattern. Also, the simulated images of the $Pb(Mg_xNb_{1-x})O_3$ with different Mg:Nb ratios obtained at a given long-range order parameter were basically the same patterns, irrespective of Mg and Nb compositions.
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KEYWORD
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$Pb(Mg_{1/3}Nb_{2/3})O_3$, Long-range Order Parameter, Computer Image Simulation, Ordered Structure
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