Crystallization Kinetics of LaF3 Nanocrystals in an Oxyfluoride Glass

被引：70

作者：

de Pablos-Martin, Araceli ^{[1
]}

Hemono, Nicolas ^{[1
]}

Mather, Glenn C. ^{[1
]}

Bhattacharyya, Sommnath ^{[2
,3
]}

Hoeche, Thomas ^{[4
]}

Bornhoeft, Hansjoerg ^{[5
]}

Deubener, Joachim ^{[5
]}

Munoz, Francisco ^{[1
]}

Duran, Alicia ^{[1
]}

Pascual, Maria J. ^{[1
]}

机构：

[1] Inst Ceram & Vidrio CSIC, Madrid 28049, Spain

[2] Leibniz Inst Oberflacgenmodifizierung EV, D-04318 Leipzig, Germany

[3] Tata Inst Fundamental Res, Dept Condensed Matter Phys & Mat Sci, Bombay 400005, Maharashtra, India

[4] Fraunhofer Inst Werkstoffmech, D-06120 Halle, Germany

[5] Tech Univ Clausthal, Inst Nichtmetall Werkstoffe, D-38678 Clausthal Zellerfeld, Germany

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2011年 / 94卷 / 08期

关键词：

TRANSMISSION ELECTRON-MICROSCOPY; FIXED VISCOSITY POINTS; CRYSTAL-STRUCTURE; FLUORIDE GLASSES; FORMING LIQUIDS; UP-CONVERSION; CERAMICS; VITROCERAMICS; LUMINESCENCE; DIFFRACTION;

D O I：

10.1111/j.1551-2916.2011.04547.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanocrystallization of LaF3 in a glass of composition 55SiO(2)-20Al(2)O(3)-15Na(2)O-10LaF(3) (mol%) has been achieved by heat treatment above the glass transition temperature. A maximum crystal size of 14 nm has been attained, with the crystalline fraction and crystal size dependent on the time and temperature of thermal treatment. The effect of lanthanum fluoride crystallization is noticeable from the microstructural and compositional changes in the glass matrix, which have been studied using several techniques, including viscosity, dilatometry, X-ray diffraction, and quantitative Rietveld refinement, transmission electron microscopy, and differential scanning calorimetry. The crystallization mechanism is shown to occur via regions of La- and Si-phase separation in the glass, from which the fluoride crystals develop during heat treatment. The interface between the glass matrix and the crystals in the demixed ranges is enriched in network formers, mainly SiO2, creating a viscous barrier, which inhibits further crystal growth and limits the crystal size to the nanometric range.

引用

页码：2420 / 2428

页数：9

共 47 条

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