Structural,dielectric, and piezoelectric properties of fine-grained NBT–BT0.11 ceramic derived from gel precursor |
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| Authors: | Marin Cernea Carmen Galassi Bogdan S Vasile Claudio Capiani Ciceron Berbecaru Ioana Pintilie Lucian Pintilie |
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| Affiliation: | 1. National Institute of Materials Physics, P.O. Box MG-7, Bucharest-Magurele 077125, Romania;2. National Research Council – Institute of Science and Technology for Ceramics, Via Granarolo 64, I-48018 Faenza, Italy;3. University POLITEHNICA of Bucharest, 060042, Romania;4. University of Bucharest, 70709 Bucharest, Romania;1. Department of Physics, Saraswati Degree Science College, Cuttack, Odisha 753012, India;2. Department of Physics and Astronomy, National Institute of Technology, Rourkela, Odisha 769008, India;1. Department of Applied Physics, Guru Jambheshwar University of Science & Technology, Hisar, 125001, Haryana, India;2. Department of Physics, MKJK College, Rohtak, 124001, Haryana, India;1. Centre for Crystal Growth, SSN College of Engineering, Kalavakkam 603 110, India;2. Laser Materials Development and Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India;3. X-ray Scattering and Crystal Growth Section, Condensed Matter Physics Division, Materials Science Group, IGCAR, Kalpakkam 603102, India;1. School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315016, China;2. Key Laboratory of Inorganic Functional Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China |
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| Abstract: | (Na1/2Bi1/2)TiO3 doped in situ with 11 mol% BaTiO3 (NBT–BT0.11) powders were synthesized by a sol–gel method, and the electrical properties of the resulting ceramics were investigated. The powders consisting of uniform and fine preliminary particles of about 50 nm were prepared by calcining the gel precursor at 700 °C. (Na1/2Bi1/2)0.89Ba0.11TiO3 ceramics, sintered at temperatures up to 1150 °C have a rhombohedral symmetry, while the ceramic sintered at 1200 °C exhibits a tetragonal crystalline structure. The ceramics show high dielectric constant (?r ～ 5456), dielectric loss of 0.02, depolarization temperature Td ～ 110 °C and temperature corresponding to the maximum value of dielectric constant Tm ～ 262 °C. The dielectric constant (?33) and the piezoelectric constant (d33) attain the maximum values of 924 and 13 pC/N, respectively, while the electromechanical coupling factor (kp) value is 0.035. The NBT–BT0.11 ceramics derived from sol–gel present high mechanical quality factor (Qm ～ 860). The dielectric and piezoelectric properties values of NBT–BT0.11 ceramics derived from sol–gel are smaller than those of samples produced by the conventional solid state reaction method, due to the grains size and oxygen vacancies that generate dipolar defects. |
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