Investigations of KTiOPO4/SiO2 sol-gel materials

被引：0
|
作者：
Kriltz, Antje [1 ]
机构：
[1] Univ Jena, Inst Phys Chem, D-07743 Jena, Germany
来源：
PHYSICS AND CHEMISTRY OF GLASSES-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART B | 2007年 / 48卷 / 03期
关键词：
D O I：
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中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Sol-gel glasses with a composition close to KTiOPO, (films and bulk gels) are synthesised from titanium propoxide, din-butyl phosphate, potassium acetate, tetraethoxysilane (TEOS) and 3-glycidoxypropyltrimethoxysilane. Thin films are drawn by dip coating. The annealing process consists of three steps: the evaporation of solvents, oxidation and removal of organics at 250 degrees C and 350 degrees C and the crystallisation between 500 degrees C and 800 degrees C. The structure formation is observed by FTIR spectroscopy (Fourier- Transform Infrared spectroscopy) and Karl-Fischer coulometry. UV- vis spectroscopic i(3+) investigations show, that the amount of T3+ ions increases with higher annealing temperatures and times. XRD measurements prove, that the crystallisation at least requires 600 degrees C At SiO2 containing bulk samples only KTiOPO, crystals are precipitated with an average diameter of about 50 mn. Annealing temperatures below 750 degrees C lead to a crystallisation of KTiOPO, crystals and higher temperatures to additional K4Ti2 57P2O16.9 crystals at SiO2 free samples. K4Ti4,P2O18.33 crystals are the only crystalline phase, found at gel film samples.
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页码：154 / 159
页数：6
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