Hydrothermal synthesis and sintering of electroceramics |
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| Affiliation: | 1. Departamento de Engenharia Metalúrgica e de Materiais, EE-UFMG, Rua Esp??rito Santo 35, 30160-030, Belo Horizonte-MG, Brazil;2. Departamento de Física, ICEx-UFMG, CP702, 30123-970, Belo Horizonte-MG, Brazil;1. Institute of Physical Chemistry, University of Stuttgart, Stuttgart, Germany;2. L’Institut Charles Sadron, Université de Strasbourg, Strasbourg, France;1. Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA;2. Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, USA;3. Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA;1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China;2. Department of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom;3. School of Science, China University of Geosciences, Beijing 100083, China;1. Department of Physics, Central University of Kerala, Kasaragod 671314, India;2. Department of Physics, Central University of Tamil Nadu, Thiruvarur 610101, India;3. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560, India;1. Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol 453552, India;2. High Pressure & Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, 400085 Mumbai, India |
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| Abstract: | The hydrothermal processing of ultrafine Pb1·88(Zn0·3Nb1·25)O5·305 and Ba(Mg0·33Nb0·67)O3 powders as well as their sintering behavior at 1000°C were investigated. The morphological analyses on nanometric powders indicated the presence of mesopores in micrometric agglomerates with open cylindrical pores. High dielectric constants were observed, showing normal frequency dispersion and an intrinsic ac relaxation, relatively masked by low frequency conductivity. The sintered ceramics presented lower dielectric permittivities than the hydrothermal powders, and a classical Cole–Cole plot could be obtained for the Pb1·88(Zn0·3Nb1·25)O5·305 electroceramic for frequencies above 103 Hz. |
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