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[ Last edited by zhang-81 on 2007-9-27 at 21:36 ]
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1, Because Eu3 + and Ca2 + in the matrix differed from a charge, Na+ ions occupied part of Ca2+ in the crystal matrix leading to the formation of electronegative NaCa¡¯ defects. It can offset the electropositive EuCa¡¯ defects resulted from the replacment of Ca2+, taking a role of charge compensation c,
2, In addition to the role of charge compensation, the impact of ionic radius should be taken into account.
3, At the point of crystal stability, their radiuses are similar. The more the radiuses of alternative atoms or ions are similar, the more solid solution are stable.
4, Radius Matching Principle

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