Effects of mono-substituting chelating agents on BaTiO3 prepared by the sol-gel process

Autor:	Yong-Chien Ling, Woei-Kwo Kuo
Rok vydání:	1994
Předmět:	Steric effects Materials science Mechanical Engineering Analytical chemistry Fast atom bombardment Grain size Amorphous solid Tetragonal crystal system Mechanics of Materials Phase (matter) Physical chemistry General Materials Science Chelation Sol-gel
Zdroj:	Journal of Materials Science. 29:5625-5630
ISSN:	1573-4803 0022-2461
DOI:	10.1007/bf00349957
Popis:	BaTiO3 of various grain size was prepared by the sol-gel process from Ti (OR)4 (R = isoC3H7 or C4H9)+Ba(CH3COO)2+chelating agent CH3COCH2COR′(R′ = CH3 or OC2H5) in a composition of equal molar ratio. Fourier transform infrared and fast atom bombardment mass spectrometry analyses suggested that the chelating agent substituted for one of the OR groups in Ti (OR)4 to form Ti (OR)3 (CH3COCHCOR′). The gelation time varied from 3 to 5 months and diminished with increasing steric hindrance. The amorphous gel was crystallized into cubic phase BaTiO3 upon heating above 650°C. The tetragonal phase was obtained after heating for 1 h at 1350°C with the theoretical Ba/Ti ratio and 1.0096 c/a value. The measured dielectric constants diminished with increasing grain size. The results illustrated the merits of altering the chemistry of the precursors to control the properties of the BaTiO3.
Databáze:	OpenAIRE
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