(1. 中南大學(xué) 物理科學(xué)與技術(shù)學(xué)院， 長沙 410075;
2. 中山大學(xué) 光電材料與技術(shù)國家重點實驗室， 廣州 510275)
摘 要: 采用溶膠-凝膠法制備了納米晶La1-xSrxMnO3， 運(yùn)用場發(fā)射掃描電鏡（FESEM）、 X射線衍射分析儀（XRD）和紅外光譜分析儀（FTIR）等手段對摻雜樣品的微結(jié)構(gòu)、 形貌等進(jìn)行了分析。 結(jié)果表明： 當(dāng)摻雜濃度x為0～0.5時， 所制備的粉體為單一鈣鈦礦相； 不同的摻雜濃度和熱處理溫度會使樣品的晶格參數(shù)發(fā)生顯著變化；La1-xSrxMnO3納米晶粒子尺寸為10～80 nm； 摻雜濃度和熱處理條件對樣品粒子尺寸產(chǎn)生很大的影響， 在相同的熱處理條件下，摻雜濃度高的樣品晶粒尺寸較小， 且摻雜濃度的增大會引起晶粒特征紅外振動的紅移和寬化現(xiàn)象。
關(guān)鍵字: 納米晶； 溶膠-凝膠； 鈣鈦礦； 晶格參數(shù)
（1. School of Physics Science and Technology,
Central South University, Changsha 410075, China；
2. State Key Laboratory of Optoelectronic Materials and
Technology, Zhongshan University, Guangzhou 510275, China）
Abstract: Nanocrystalline La1-xSrxMnO3 powders were prepared by sol-gel process. The structure and particle-size of the powders were controlled by adjusting the annealing temperature. The morphologies and microstructures of the powders were analyzed by field emission scanning electron microcopy (FESEM), X-ray diffractometry(XRD) and Fourier-transformed infrared spectroscopy(FTIR). The results show that La1-xSrxMnO3 is single perovskite structure if doped concentration x is 0-0.5. The crystal lattice parameters of the sample are changed obviously with the change of doped concentration and annealing temperature. The particle-size of the powders is 10-80 nm and influenced greatly by the doped concentration.At the same annealing temperature, the higher doped concentration is, the smaller particle-size of the powders is. The concentration increase of doped ion will make the characteristic infrared absorb peaks to shift to higher warenumber and broader frequencies.
Key words: nanocrystalline; sol-gel; perovskite; crystal lattice parameters
