Defect structure transformation during substitution in quadruple perovskite CaCu3-xTi4-xFe2xO12 studied by positron annihilation spectroscopy |
| |
| Affiliation: | 1. Department of Physics, Saurashtra University, Rajkot, 360 005, India;2. Applied Nuclear Physics Division, Saha Institute of Nuclear Physics, Kolkata, 700064, India;1. Programa Pós-Graduação em Química Aplicada, Universidade Estadual de Ponta Grossa, Av. Gen. Carlos Cavalcanti 4748, 84.030-000, Ponta Grossa, Paraná, Brazil;2. Programa de Pós-Graduação em Ciências/Física, Universidade Estadual de Ponta Grossa, Av. Gen. Carlos Cavalcanti 4748, 84.030-000, Ponta Grossa, Paraná, Brazil;3. Dpto. de Química Inorgánica y Orgánica, Universitat Jaume I, Av. de Vicent Sos Baynat, s/n, 12071, Castellón de la Plana, Spain;1. UGC-DAE-Consortium for Scientific Research, Mumbai Centre, BARC Campus, Trombay, Mumbai 400085, India;2. Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin D-14109, Germany;3. Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India;1. Innovation Research Team for Advanced Ceramics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China;2. Department of ATF R&D, China Nuclear Power Technology Research Institute, China General Nuclear Power Corporation (CGN), Shenzhen, 518026, China;1. Integrated Nanotechnology Research Center and Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand;2. School of General Science, Faculty of Liberal Arts, Rajamangala University of Technology Rattanakosin, Wang Klai Kangwon Campus, Hua Hin, Prachaub Khiri Khan, 77110, Thailand;1. Department of Physics, Saurashtra University, Rajkot 360 005, India;2. M.N.College, Visnagar 384 315, India;1. División de Estudios de Posgrado e Investigación, Instituto Tecnológico de Saltillo, 25280 Saltillo, Coahuila, Mexico;2. GFMA, Departamento de Física Aplicada, Escuela Técnica Superior de Ingenieros Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain;3. Instituto de Investigaciones Eléctricas, 62490 Cuernavaca, Morelos, Mexico;4. Institute of Solid State Physics, Vienna University of Technology, Wien A-1040, Austria;5. Cinvestav Unidad Saltillo, Apartado Postal 663, 25000 Saltillo, Coahuila, Mexico |
| |
| Abstract: | Positron annihilation spectroscopic studies have been performed to investigate the defect structural evolution in polycrystalline CaCu3-xTi4-xFe2xO12 (x = 0.0, 0.1, 0.3, 0.5 and 0.7) cubic perovskite samples. The positron lifetimes, relative intensities and Doppler-broadened annihilation lineshape parameters all indicate about the annulment of crystalline vacancies from the structure and attending porous ceramic structure at higher concentration of substitution. The compositional dependence of the intensity of the defect specific positron lifetime component clearly suggests that, in the initial stages of substitution, positron annihilates in vacancy-type defects. But, for higher concentrations of Fe3+, the materials are devoid of such defects and positron trapping takes place within the pores. The results of coincidence Doppler broadening spectroscopy measurements support such transformation in which the positron trapping sites are relocated to the ceramic pores leading to the modification of the material properties. |
| |
| Keywords: | Calcium-copper-titanate Defects Positron annihilation Vacancies |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
