【作者】 甄强； 李榕； 袁强； Michel Drache； Rose-Noelle Vannier； 鲁雄刚；

【Author】 ZHEN Qiang~(1,3),LI Rong~(1,2),YUAN Qiang~3,Michel Drache~2, Rose-Noelle Vannier~2,LU Xiong-gang~1 (1.School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China; 2.UCCS:Unite de Catalyse et de Chimie du Solide-UMR CNRS 8181,Villeneuve d’Ascq Cedex 59652,France; 3.Nano-science and Nano-technology Research Center,Shanghai University,Shanghai 200444,China)

【机构】 上海大学材料科学与工程学院； 上海大学纳米科学与技术研究中心； 法国里尔科技大学固体化学与催化国家实验室；

【摘要】 以分析纯Bi2_O3和Ln₂O₃（Ln=Y,Er,Dy）为原料,采用反向滴定共沉淀法合成Bi和Ln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Bi₂O₃-Ln₂O₃的纳米粉体,高温XRD结果表明该粉体主要为β相,并且随温度升高在650℃左右转变为δ相。通过热力学计算,确定了SPS下烧结Bi₂O₃-Ln₂O₃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Bi_0.75Er_0.25O_1.5陶瓷,平均晶粒尺寸为均<20nm。更多还原

【Abstract】 Using analytically pure Bi₂O₃ and Er₂O₃ as raw materials,the precursor of Bi and Er can be precipitated by reverse titration co-precipitation method,and the adequate pH value for co-precipitation was also analyzed. Bi_0.75Er_0.25O_1.5 nano-powder was obtained after calcining this precursor at 500℃for 3h.High temperature XRD results showed that this nanopowder was mainly inβform,with an average grain size of 10nm calculated by Scherrer Equation,which transformed intoδform completely at 650℃.According to the thermodynamic calculation,the suitable temperature and partial pressure of oxygen was chose.Finally,denseδ-Bi_0.75 Er_0.25O_1.5 solid electrolyte was sintered at 500℃（measured temperature） for 1min,with a relative density of 96%and an average grain size of 18nm.更多还原