Synthesis of Nanocrystalline La1-xSrxCrO3 by Sol-Gel Method
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第3期
论文作者：Li DeHui
Key words：sol-gel method; La1-xSrxCrO3; nanocrystalline;
Abstract: The nanocrystalline La1-xSrxCrO3 was prepared by sol-gel method using La( NO3 )3 · 6H2O, Sr( NO3 )2 and respectively. The phase transformation from dry-gel to crystal was investigated by means of TG, DSC and XRD. Influences of temperature and Sr quantity on particle-diameters were observed by HREM. The experimental results show that the best calcined temperature is near 800 ℃. The particle-diameters decrease with the increase of Sr quantity. The chromite phase formed continuously during crystallization process, which is mainly composed of four steps: ( 1 ) Carbonates first formed by decomposing metal citrates. (2) The decomposition of carbonates occurred metal oxides. (3) La0. 9Sr0.1 CrO4 were synthesized by the reaction of metal oxides. (4) Chromite phase formed lastly due to the decomposition of chromate phase.
Zhao Xinming1，Li DeHui2，Ao Qing1，SUN Liangcheng1
(1.College of Material Science and Engineering, Shandong University, Ji'nan 250061, China;
2.Baotou Research Institute of Rare Earth, Baowu 014010, China)
Abstract:The nanocrystalline La1-xSrxCrO3 was prepared by sol-gel method using La( NO3 )3 · 6H2O, Sr( NO3 )2 and respectively. The phase transformation from dry-gel to crystal was investigated by means of TG, DSC and XRD. Influences of temperature and Sr quantity on particle-diameters were observed by HREM. The experimental results show that the best calcined temperature is near 800 ℃. The particle-diameters decrease with the increase of Sr quantity. The chromite phase formed continuously during crystallization process, which is mainly composed of four steps: ( 1 ) Carbonates first formed by decomposing metal citrates. (2) The decomposition of carbonates occurred metal oxides. (3) La0. 9Sr0.1 CrO4 were synthesized by the reaction of metal oxides. (4) Chromite phase formed lastly due to the decomposition of chromate phase.
Key words:sol-gel method; La1-xSrxCrO3; nanocrystalline;
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