钆锆烧绿石粉体的高温固相制备工艺
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摘要
为获得钆锆烧绿石(Gd2Zr2O7)粉体的制备工艺条件,以Gd2O3和ZrO2粉体为原料,在温度为1 300～1 500℃的条件下,采用高温固相法制备钆锆烧绿石粉体;采用X射线衍射法对所制备的样品进行物相与结构分析,用扫描电子显微镜观察样品的微观形貌。结果表明,在常压、保温72 h的条件下,钆锆烧绿石的最佳煅烧温度为1 500℃,此时所制备的晶体结晶程度高,晶粒尺寸在3μm左右。
To obtain the process of preparing pyrochlore Gd2Zr2O7 powders,Gd2O3 and ZrO2 were used as raw materials in the experiment.Pyrochlore Gd2Zr2O7 powders were prepared by high temperature solid state method at 1 300～1 500 ℃ under atmospheric pressure.XRD and SEM were used to analyze the phases,structure and microcosmic shape of synthetic samples.The results indicate that the best synthesis temperature of pyrochlore Gd2Zr2O7 is 1 500 ℃.The crystalline degree of samples is high.The average crystal grain size is approximately 3 μm.
To obtain the process of preparing pyrochlore Gd2Zr2O7 powders,Gd2O3 and ZrO2 were used as raw materials in the experiment.Pyrochlore Gd2Zr2O7 powders were prepared by high temperature solid state method at 1 300～1 500 ℃ under atmospheric pressure.XRD and SEM were used to analyze the phases,structure and microcosmic shape of synthetic samples.The results indicate that the best synthesis temperature of pyrochlore Gd2Zr2O7 is 1 500 ℃.The crystalline degree of samples is high.The average crystal grain size is approximately 3 μm.
引文
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[2]WILDE P J,CATLOW C R A.Defects and diffusion in pyrochlorestructured oxides[J].Solid State Ionics,1998,112(3/4):173-183.
[3]THOROGOOD G J,KENNEDY B J,AVDEEV M,et al.Cationdisorder in NaW2O6+δ.nH2-zO post-ion exchange with K,Rb,Sr andCs[J].Journal of Physics and Chemistry of Solids,2011,72(6):692-700.
[4]ISMUNANDAR,KENNDY B J,HUNTER B A.Observations onpyrochlore oxide structures[J].Materials Research Bulletin,1999,34(8):1263-1274.
[5]ERICKSON E E,GRAY D,TAYLOR K,et al.Synthesis,structureand dielectric characterization of Ln2Ti2-2xM2xO7(Ln=Gd,Er;M=Zr,Sn,Si)[J].Materials Research Bulletin,2002,37(13):2077-2083.
[6]ISMUNANDAR,KENNDY B J,HUNTER B A.Structural andmagnetic studies of manganese-containing pyrochlore oxides[J].Journal of Alloys and Compounds,2000,302(1/2):94-100.
[7]WEBER W J,EWING R C.Plutonium immobilization and radiationeffects[J].Science,2000,289(5487):2051-2052.
[8]JIANG W,WEBER W J,THEVUTHASAN S,et al.Effect of ionirradiation in cadmium niobate pyrochlores[J].Nuclear Instruments andMethods in Physics Research Section B:Beam Interactions withMaterials and Atoms,2003,207(1):85-91.
[9]MILLIFORD R E,WEBER W J.Computer simulation of Pu3+and Pu4+substitutions in gadolinium zirconate[J].Journal of Nuclear Materials,2001,299(2):140-147.
[10]曾伟伟,肖彩梅,陈红霞.烧绿石型复合氧化物的制备及其光催化性能[J].化工中间体,2011(4):32-35.
[11]WUENSCH B J,EBERMAN K W,HEREMANS C,et al.Connec-tion between oxygen-ion conductivity of pyrochlore fuel-cell mater-ials and structural change with composition and temperature[J].SolidState Ionics,2000,129:111-133.