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A Study on the Mechanism of the Abnormal Reduction of Eu3+→Eu2+ in Sr2B5O9Cl Prepared in Air at High Temperature

✍ Scribed by Z. Pei; Q. Zeng; Q. Su

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 108 KB
Volume: 145
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8246

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✦ Synopsis

This paper reports a new observation of the abnormal reduction of Eu 3؉ PEu 2؉ in Sr 2 B 5 O 9 Cl when prepared in air at high temperature. A model based on the nature of substitution defects is proposed to explain this abnormal reduction. Electrons, which reduced the Eu 3؉ ions, are created by the substitution of cations 5rst and then transferred to the target Eu 3؉ ions via tetrahedral borate anion groups. Codoping experiments are designed and performed. The results of these experiments support the model proposed.

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