Synthesis of rutile-type solid solution Ni1−xCoxTi(Nb1−yTay)2O8 (0 ≤ x ≤ 1, 0 ≤ y ≤ 1) and its optical property

Journal of Asian Ceramic Societies

Nobuhiro Kumada¹  Narumi Koike¹  Kousuke Nakanome¹  Sayaka Yanagida¹  Takahiro Takei¹  Akira Miura²  Eisuke Magome³  Chikako Moriyoshi³  Yoshihiro Kuroiwa³ 

[1] Center for Crystal Science and Technology, University of Yamanashi, Miyamae-cho 7-32, Kofu 400-8511, Japan;Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo 060-8628, Japan;Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan;

关键词: Solid state reaction;    Rutile-type structure;    Trirutile-type structure;    Crystal structure refinement;   

DOI  :  10.1016/j.jascer.2017.05.005

来源: DOAJ

【 摘 要 】

Rutile-type solid solutions; Ni1−xCoxTi(Nb1−yTay)2O8 (0 ≤ x ≤ 1, 0 ≤ y ≤ 1) were prepared by high temperature solid state reaction. The solid solutions of noibates (y = 0) had a rutile-type structure and those of tantalates (y = 1.0) had a trirutile-type one. The trirutile-type structure appeared in the composition of y ≥ 0.4. The crystal structures of these solid solutions for niobates and tantalates were refined by using synchrotron X-ray powder diffraction data and the R-factors were Rwp = 1.76–1.92% and Rp = 1.13–1.19% for niobates and Rwp = 10.3–12.2% and Rp = 6.78–9.14% for tantalates. Their lattice parameters for noibates ranges from a = 4.69413(2) to 4.70411(2) Å and c = 3.02187(1) to 3.03242(1) Å and those for tantalates ranges from a = 4.6946(2) to 4.7065(2) Å and c = 9.0829(3) to 9.1164(4) Å. The optical band gap for these solid solutions ranged from 1.63 to 2.50 eV and only NiTiTa2O8 exhibited photocatalytic activity for phenol decomposition under UV light irradiation. The dielectric constants for four end members, NiTiNb2O8, CoTiNb2O8, NiTiTa2O8 and CoTiTa2O8 were 25–75 in the temperature range from room temperature to 300 °C.

【 授权许可】

Unknown