EPR of Mn as densifying agent in SnO2 powders

被引：13
|
作者：
Las, WC
Gouvea, D
Sano, W
机构：
[1] UNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
[2] Univ Sao Paulo, Escola Politecn, Dept Met & Mat Engn, BR-05508900 Sao Paulo, Brazil
[3] Univ Sao Paulo, Inst Fis, BR-05508900 Sao Paulo, Brazil
来源：
SOLID STATE SCIENCES | 1999年 / 1卷 / 06期
基金：
巴西圣保罗研究基金会;
关键词：
D O I：
10.1016/S1293-2558(00)80087-4
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Electron Paramagnetic Resonance (EPR) spectra have been obtained at room temperature and at X-band in powders of SnO2 doped with Mn from 0.3 to 10% and submitted to heal treatment from 500 to 900 degrees C, Mn ions are probably located at particle surfaces as Mn2+, evidenced by its single EPR line which narrows by the exchange interaction effect due to particle growth observed by the BET technique. In samples doped above 1% formation of Mn3O4 is detected on particle surfaces and a small quantity of Mn is thermally diffused into the bulk as Mn4+, Powders compacted and sintered at 1300 degrees C confirmed that Mn2+ ions remain at grain boundaries acting as densifying agent.
引用
收藏
页码：331 / 337
页数：7
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