Structural phase transitions and electrical properties of (KxNa1?x)NbO3-based ceramics modified with Mn |
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| Authors: | Henry E Mgbemere Manuel Hinterstein Gerold A Schneider |
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| Affiliation: | 1. Institute of Advanced Ceramics, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany;2. Institut für Werkstoffwissenschaft, Technische Universität Dresden, Helmholtzstraße 7, 01069 Dresden, Germany;1. Department of Semiconductor & Display Engineering, Hoseo University, Baebang, Asan, Chungnam 336-795, Republic of Korea;2. Department of Materials Science & Engineering, Hoseo University, Baebang, Asan, Chungnam 336-795, Republic of Korea;1. Department of Materials Science, Sichuan University, Chengdu 610064, PR China;2. King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), Thuwal 23955-6900, Saudi Arabia;1. Electroceramic Department, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049, Madrid, Spain;2. Department of Physics, Universitat Politècnica de Catalunya—BarcelonaTech, Jordi Girona 1-3, 08034 Barcelona, Spain;3. Institute of Research in Materials Science and Technology (INTEMA) (CONICET—University of Mar del Plata), J. B. Justo 4302, B7608FDQ Mar del Plata, Argentina |
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| Abstract: | (K0.5Na0.5)NbO3 (KNN) ceramics and KNN containing Li, Ta modified with 2 mol% of manganese have been produced using the mixed-oxide ceramics synthesis route. The structure and properties of these piezoelectric ceramics modified with manganese have been investigated using high resolution X-ray diffraction and electrical characterisation. The structural information about the ceramics was determined by Rietveld refinement with Fullprof. The phase transition temperatures observed with X-ray diffraction compares well with the values from dielectric studies. The addition of Mn slightly reduced the phase transition temperatures and for the sample containing only Li, the phase changed from orthorhombic to monoclinic phase with space group Pm. The dielectric, piezoelectric and ferroelectric properties of the samples decreased with Mn addition due to hard doping effects resulting from oxygen vacancies in the perovskite lattice. |
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