CAJ | 학술논문

以氨水和碳酸铵为沉淀剂,采用氧化.共沉淀法制备了Ce0.65Zr0.25Y0.1O1.95复合氧化物,并对不同处理温度下制备的样品用热重.差示扫描分析(TG-DSC)、傅里叶变换红外(FT-IR)光谱、X射线衍射(XRD)和表面分析仪(BET)等进行了表征.结果表明,共沉淀法得到的沉淀物同时含有羟基和羧基,随着焙烧温度的升高,分别在100-170 ℃、250-300℃和420-500℃温度范围内先后发生脱水、脱羟基和脱羧基反应,在此过程中固溶体逐渐形成.提出了由沉淀物转变为Ce0.65Zr0.25Y0.1O1.95复合氧化物的结构转变模型.
이안수화탄산안위침정제,채용양화.공침정법제비료Ce0.65Zr0.25Y0.1O1.95복합양화물,병대불동처리온도하제비적양품용열중.차시소묘분석(TG-DSC)、부리협변환홍외(FT-IR)광보、X사선연사(XRD)화표면분석의(BET)등진행료표정.결과표명,공침정법득도적침정물동시함유간기화최기,수착배소온도적승고,분별재100-170 ℃、250-300℃화420-500℃온도범위내선후발생탈수、탈간기화탈최기반응,재차과정중고용체축점형성.제출료유침정물전변위Ce0.65Zr0.25Y0.1O1.95복합양화물적결구전변모형.
Ceoe,Zr0.65Y0.1O1.95 oxides were prepared by oxidation-coprecipitation method using ammonia and salvolatile as precipitators.The as-prepared samples were thermally treated at different temperatures and characterized by thermogravimetry-differentiai scanning calorimetry(TG-DSC),Fourier transform-infrared(FI'-IR)spectrometry,X-ray diffraction(XRD),and specific surface area measurements(BET).The results showed that the hydroxyl and carboxyl groups coexisted in the precipitate and a perfect solid solution was gradually formed with an increase in calcination temperature.The physisorbed water was lost from 100 to 170 ℃,hydroxyl groups were removed from 250 to 300 ℃,and the carboxyl groups were eliminated from 420 tO 500℃.A structure model was further proposed to understand the Ce0.65Zr0.25Y0.1O1.95 structure evolution process in depth.