材料期刊网

Investigation of Truc Ni~(2+)-Halide Distances in Alkali Halide Lattices

Xuanrong MA(Department of Physics , Ningxia University , Yinchuan , 750021 , China)Maolu DU(Institute of Solid State Physics , Sichuan Normal University , Chengdu , 610066 , China)(To whom correspondence should be addressed)

材料科学技术（英文）

Using the μKα model of Ni2+-6X- cluster, the true distances between impurity Ni2+ cation and halide anion in alkali halide lattices are estimated from the optical spectra data. The results suggest that the true impurity cation- ligand anion distances are close to the sum of ionic radii of the impurity cation and ligand anion but not the cation - anion distance of the perfect lattices in the case of that the ionic radius of host cation is more larger than that of impurity cation

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Opening Ceremony of Sichuan Rare-Earth Research Center & Ruisi Rare-Earth Company Holding in Sichuan University

稀土学报(英文版)

关键词:

Opening Ceremony of Sichuan Rare-Earth Research Center & Ruisi Rare-Earth Company Holding in Sichuan University

稀土学报(英文版)

关键词:

Opening Ceremony of Sichuan Rare-Earth Research Center & Ruisi Rare-Earth Company Holding in Sichuan University

稀土学报(英文版)

关键词:

Opening Ceremony of Sichuan Rare-Earth Research Center & Ruisi Rare-Earth Company Holding in Sichuan University

稀土学报(英文版)

关键词:

Opening Ceremony of Sichuan Rare-Earth Research Center & Ruisi Rare-Earth Company Holding in Sichuan University

稀土学报(英文版)

关键词:

Opening Ceremony of Sichuan Rare-Earth Research Center & Ruisi Rare-Earth Company Holding in Sichuan University

稀土学报(英文版)

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ON THE MONTE CARLO SIMULATION OF NORMAL GRAIN GROWTH

Y.T. Liu , X.J. Guan , X.M. Shen , X.F. Ma , L.J.Wang , null , null , null , null

金属学报(英文版)

The microstructures and their kinetics of normal grain growth are simulated using different Monte Carlo (MC) algorithms. Compared with the relative figures and the theoretical normal grain growth exponents of n=0.5, the effects of some factors of MC algorithm, i.e. the lattice types, the methods of selecting lattice sites, and the neighbors selection for energy calculations, on the simulation results of grain growth are studied. Two methods of regression were compared, and the three-parameter nonlinear regression is much more suitable for fitting the grain growth kinetics. A better model with appropriate factors included triangular lattice, the attempted site randomly selected, and the first and second nearest neighbors for energy calculations is obtained.

关键词: Grain growth , null , null

Domain structure in calcium-cerium fluorocarbonate minerals, Mianning County, Sichuan Province, China

稀土学报(英文版)

The domain structures in calcium-cerium fluorocarbonate mineral series from a rare earth mineral deposit within an aegirine alkali granite massif in Mianning County, Sichuan Province, China, were studied by means of transmission electron microscopy. Many categories of domain structures in this mineral series were observed and investigated, including the microtwin domains of parisite-6R(2) and B2S-6R, the antiphase domains of B2S-2H. The results show that the antiphase domains which are faults along crystal plane (0001) are formed by the displacement of crystal lattice in c * direction and the displacement is 0.471 nm. A new polytype (B4S2-3R) of regular mixed-layer structure with B4S2 type is found in the domain region of mixed-layer structure.

关键词: rare earths;Ca-Ce fluorocarbonate mineral;domain structure;polytype

STABILIZATION OF BETA-QUARTZ AT ROOM-TEMPERATURE AND NORMAL-PRESSURE

Materials Letters

beta-quartz, stable at room temperature and under normal pressure, is obtained by high-pressure quenching, using an all-silicon ZSM-5 zeolite as the reaction precursor and characterized by means of X-ray diffraction.

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