碱金属氟化物对固相法合成钙钛矿型KTaO_3粉体的影响
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摘要
以碳酸钾和氢氧化钽为原料,分别添加不同的碱金属氟化物LiF、NaF和KF,通过固相法在600℃下合成纯净的钙钛矿型KTaO3粉体;采用X射线衍射仪、扫描电镜、透射电镜、紫外-可见漫散射光谱仪以及激光粒度分析仪对合成的样品进行表征。结果表明,添加剂不同,制备得到的钙钛矿型KTaO3粉体的微观结构不同,产物粒径按添加LiF、NaF和KF的顺序呈减小的趋势,且通过添加KF获得的产物颗粒生长比较完美。
Pure perovskite-type KTaO3powders were synthesized by solid state method at 600 ℃ using potassium carbonate and tantalum hydroxide with the addition of different alkaline fluorides LiF, NaF and KF. XRD, SEM, TEM, UV-Vis DRS spectrometry and laser particle size analysis were used to characterize the products. The results show that the microstructure of perovskite-type KTaO3powders varies according to different additives. The particle size has the tendency of reduction with the order of adding LiF, NaF and KF. Perfect particles can be obtained by adding KF to the reaction system.
Pure perovskite-type KTaO3powders were synthesized by solid state method at 600 ℃ using potassium carbonate and tantalum hydroxide with the addition of different alkaline fluorides LiF, NaF and KF. XRD, SEM, TEM, UV-Vis DRS spectrometry and laser particle size analysis were used to characterize the products. The results show that the microstructure of perovskite-type KTaO3powders varies according to different additives. The particle size has the tendency of reduction with the order of adding LiF, NaF and KF. Perfect particles can be obtained by adding KF to the reaction system.
引文
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[2]LIU J W,CHEN G,LI Z H,et al.Hydrothermal synthesis and photocatalytic properties of ATaO3and ANbO3(A=Na and K)[J].International Journal of Hydrogen Energy,2007,32(13):2269-2272.
[3]FU X L,WANG X X,DENNIS Y C,et al.Photocatalytic reforming of glucose over La doped alkali tantalate photocatalysts for H2production[J].Catalysis Communications,2010,12(3):184-187.
[4]KATO H,KUDO A.Photocatalytic reduction of nitrate ions over tantalate photocatalysts[J].Physical Chemistry Chemical Physics,2002,4(12):2833-2838.
[5]宁明杰,董发勤,张宝述,等.钆锆烧绿石粉体的高温固相制备工艺[J].中国粉体技术,2012,18(5):37-39.
[6]陶剑青,杨行勇,史晓亮,等.具有高可见光催化性能W掺杂纳米TiO2的制备与表征[J].中国粉体技术,2012,18(4):15-20.
[7]HAYASHI H,HAKUTA Y.Hydrothermal epitaxy of KTaO3thin films under supercritical water conditions[J].Journal of Mater Science,2008,43(7):2342-2347.
[8]WANG Xiaohui,ZHENG Shili,ZHANG Yi.A novel method to prepare ultrafine potassium tantalate powders[J].Materials Letters,2008,62(8/9):1212-1214.
[9]THOMPSON J R,BOATNER L A,THOMSON J O.Very lowtemperature search for superconductivity in Semiconducting KTaO3[J].Journal of Low Temperature Physics,1982,47(5/6):467-475.
[10]MIZOGUCHI H,SLEIGHT A W,SUBRAMANIAN M A.Low temperature synthesis and characterization of SnTa2O6[J].Materials Research Bulletin,2009,44(5):1022-1024.
[11]ISHIHARA T,BAIK N S,ONO N,et al.Effects of crystal structure on photolysis of H2O on K-Ta mixed oxide[J].Journal of Photochemistry and Photobiology:A:Chemistry,2004,167(2/3):149-157.
[12]段少勇,苏婷婷,姜恒,等.改进的低温固相法制备钙钛矿型KTaO3[J].高等学校化学学报,2012,33(10):2164-2168.
[13]ZHAO Deming,JIANG Heng,GONG Hong,et al.Absorption of ammonia on tantalum hydroxide synthesized by a hydrofluoric acid method[J].Transition Metal Chemistry,2011,36(1):119-123.
[14]仲维卓,华素坤.晶体生长形态学[M].北京:科学出版社,1999:260.
[15]廖立兵.晶体化学及晶体物理学[M].北京:地质出版社,2000:58.