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《Chinese Science Bulletin》 2014-01
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Spectroscopic exploration of growth mechanism of LaF_3 nanocrystals embedded in glass ceramics under restricted conditions

GAO DangLi;ZHANG XiangYu;ZHENG HaiRong;LIANG Liang;YANG YongMing;College of Science, Xi'an University of Architecture and Technology;Electronic Materials Research Laboratory, Xi'an Jiaotong University;College of Physics and Information Technology, Shaanxi Normal University;  
Eu3+doped 45SiO2-25Al2 O3-18Na2 O-9.5LaF3-2.5EuF3 glass was successfully prepared via solid-state reaction, and the corresponding glass ceramics showing an excellent optical property was also synthesized by annealing the prepared glass at 700°C. The glass ceramics was characterized by XRD, TEM and spectroscopic routes. The results indicated that LaF3 nanocrystals with size about 25 nm were embedded uniformly into the annealed glass. The Eu3+ions in glass phase and crystal phase local environment are excited selectively using the spectroscopic strategy. The difference of emission spectra of Eu3+in the glass ceramics, nanocrystals and glass matrices was compared in detail. We made up the characteristic spectrum of Eu3+in glass ceramics using the spectra of Eu3+in nanocrystals and glass matrices and subsequently inferred the radio of rare-earth ions located in two kinds of local ambiences including glass phase and crystal phase ambience. The effects of annealing temperatures and heavy metallic ions in starting materials on the growth of LaF3 nanocrystals are explored as well.
【Fund】: 陕西省教育厅专项基金(12JK0453);; 西安建筑科技大学青年科技基金(QN1237);; 西安建筑科技大学学科建设人才基金(DB12065)资助
【CateGory Index】: TQ171.733
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