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以分析纯Bi2O3和Er2O3为原料,采用反向滴定共沉淀法合成Bi和Er的氢氧化物前驱体,并对共沉淀的pH值条件进行了分析。将该前驱体在500℃焙烧3h后得到Bi0.75Er0.25O1.5的纳米粉体,高温XRD结果表明该粉体主要为β相,谢乐公式计算平均晶粒尺寸为10nm,并且随温度升高在650℃转变为δ相。通过热力学计算,确定了SPS下烧结Bi0.75Er0.25O1.5陶瓷适宜的温度和氧分压条件,最后在测试温度为500℃保温1min得到了相对密度达到96%的δ相纳米晶的Bi0.75Er0.25O1.5陶瓷,平均晶粒尺寸为18nm。
The analytic pure Bi2O3 and Er2O3 were used as raw materials to synthesize the precursor of Bi and Er hydroxide by reverse titration coprecipitation. The pH value of coprecipitation was analyzed. The precursor was calcined at 500 ℃ for 3h to obtain Bi0.75Er0.25O1.5 nanopowders, high temperature XRD results show that the powder is mainly β phase, Xie Le formula to calculate the average grain size of 10nm, and with the temperature rise High at 650 ℃ to δ phase. Through the thermodynamic calculation, the appropriate temperature and partial pressure of oxygen for Bi0.75Er0.25O1.5 sintered under SPS were determined. Finally, the Bi0 of δ-phase nanocrystals with the relative density of 96% was obtained by keeping the test temperature at 500 ℃ for 1min. 75Er0.25O1.5 ceramic, the average grain size of 18nm.