期刊
SOLID STATE COMMUNICATIONS
卷 123, 期 6-7, 页码 295-297出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0038-1098(02)00266-1
关键词
nanostructures; surfaces and interface
The competition between the long-range Coulomb attractive and the short-range repulsive interaction in ionic nanocrystals creates an effective negative pressure, which causes the lattice parameter a to increase with decreasing nanoparticle size d. A simple 'Madelung model' is used to predict the dependence of the lattice parameter for CeO2 and BaTiO3 on d, deltaa/a = alpha/d, for alpha = 0.22 and 0.18 Angstrom, respectively. The model predictions are compared with experimental results. (C) 2002 Elsevier Science Ltd. All rights reserved.
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