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- Title
Synthesis of SrLaAlO fine ceramic powders by co-precipitation process.
- Authors
Chen, Xiang; Wu, Shu
- Abstract
SrLaAlO fine ceramic powders were synthesized by a co-precipitation process from the raw materials of La(NO)·6HO (99 %), Al(NO)·9HO (98-102 %) and SrCl·6HO (99 %). Effects of the precipitating pH value and thermal treatment temperature upon the phase constitution and microstructures of the product powders were determined together with the reaction mechanisms. The precipitating pH value indicated a key role dominating the reaction process. For the situation of precipitating pH = 7, SrLaAlO phase began to form around 900 °C and became the major phase above 1,000 °C where small amount of secondary phases of LaO, LaSrAlO, LaAlO were detected. With increasing the precipitating pH value to 8 and 9, SrLaAlO major phase were obtained at 900 °C together with small amount of secondary phases of LaO, LaSrAlO and La(OH), and the amount of secondary phases decreased with increasing thermal treatment temperature. The grain morphology of the product powders was also determined by the precipitating pH value and the thermal treatment temperature. SrLaAlO fine ceramic powders with homogenous morphology and less secondary phases were obtained by heating the precursors with precipitating pH = 9 at 900 and 1,000 °C in air for 10 h. Densification of SrLaAlO ceramics derived from the present powders could be achieved at 1,450 °C, and the optimal microwave dielectric properties were obtained as: ε = 19.5, Qf = 56,500 GHz, τ = −32.8 ppm/°C.
- Subjects
STRONTIUM compounds; CERAMIC powders synthesis; PRECIPITATION (Chemistry); HYDROGEN-ion concentration; MICROSTRUCTURE; CHEMICAL reactions
- Publication
Journal of Materials Science: Materials in Electronics, 2013, Vol 24, Issue 7, p2445
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-013-1116-3