Abstract
High-resolution (0.2nm) images are used to locate chemical domains occurring with length scales of 1-5nm in the dielectric relaxor lead magnesium niobate (PMN). The experimental HRTEM images are analysed using computer-simulations and image matching in order to clarify and characterize the nature of the chemical ordering. Madelung electrostatic energy calculations are used to rank a set of structural models for possible ordered and disordered distributions of Nb and Mg over the B-sites of perovskite ABO{sub 3}. Next, the chemical domain textures are modelled using next-nearest-neighbour Ising (NNNI) models and Monte Carlo methods. This results in a preferred model for the B-site distribution (the extended NNN-Ising model), which is used for image simulations. Both HRTEM many-beam bright-and dark-field and single-beam dark-field TEM images are obtained and compared with the experimental images. The final result is a realistic atomic model for the Nb, Mg distribution of PMN. 42 refs., 2 tabs., 10 figs.
Citation Formats
Bursill, L A, Qian, Hua, Peng, Julin, and Fan, X D.
Observation and analysis of nanodomain textures in dielectric relaxor lead magnesium niobate.
Australia: N. p.,
1995.
Web.
Bursill, L A, Qian, Hua, Peng, Julin, & Fan, X D.
Observation and analysis of nanodomain textures in dielectric relaxor lead magnesium niobate.
Australia.
Bursill, L A, Qian, Hua, Peng, Julin, and Fan, X D.
1995.
"Observation and analysis of nanodomain textures in dielectric relaxor lead magnesium niobate."
Australia.
@misc{etde_111853,
title = {Observation and analysis of nanodomain textures in dielectric relaxor lead magnesium niobate}
author = {Bursill, L A, Qian, Hua, Peng, Julin, and Fan, X D}
abstractNote = {High-resolution (0.2nm) images are used to locate chemical domains occurring with length scales of 1-5nm in the dielectric relaxor lead magnesium niobate (PMN). The experimental HRTEM images are analysed using computer-simulations and image matching in order to clarify and characterize the nature of the chemical ordering. Madelung electrostatic energy calculations are used to rank a set of structural models for possible ordered and disordered distributions of Nb and Mg over the B-sites of perovskite ABO{sub 3}. Next, the chemical domain textures are modelled using next-nearest-neighbour Ising (NNNI) models and Monte Carlo methods. This results in a preferred model for the B-site distribution (the extended NNN-Ising model), which is used for image simulations. Both HRTEM many-beam bright-and dark-field and single-beam dark-field TEM images are obtained and compared with the experimental images. The final result is a realistic atomic model for the Nb, Mg distribution of PMN. 42 refs., 2 tabs., 10 figs.}
place = {Australia}
year = {1995}
month = {Oct}
}
title = {Observation and analysis of nanodomain textures in dielectric relaxor lead magnesium niobate}
author = {Bursill, L A, Qian, Hua, Peng, Julin, and Fan, X D}
abstractNote = {High-resolution (0.2nm) images are used to locate chemical domains occurring with length scales of 1-5nm in the dielectric relaxor lead magnesium niobate (PMN). The experimental HRTEM images are analysed using computer-simulations and image matching in order to clarify and characterize the nature of the chemical ordering. Madelung electrostatic energy calculations are used to rank a set of structural models for possible ordered and disordered distributions of Nb and Mg over the B-sites of perovskite ABO{sub 3}. Next, the chemical domain textures are modelled using next-nearest-neighbour Ising (NNNI) models and Monte Carlo methods. This results in a preferred model for the B-site distribution (the extended NNN-Ising model), which is used for image simulations. Both HRTEM many-beam bright-and dark-field and single-beam dark-field TEM images are obtained and compared with the experimental images. The final result is a realistic atomic model for the Nb, Mg distribution of PMN. 42 refs., 2 tabs., 10 figs.}
place = {Australia}
year = {1995}
month = {Oct}
}