New dielectric materials of xSrTiO3–(1 − x)Ca(Mg1/3Nb2/3)O3 ceramic system at microwave frequency |
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| Affiliation: | 1. Department of Physics, Faculty of Science, Damietta University, New Damietta City, Egypt;2. Division of Fluid and Experimental Mechanics, Luleå University of Technology, Sweden;1. Departament d’Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Ed. I2, 08019, Barcelona, Spain;2. Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, 08019, Barcelona, Spain;1. Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, 76100, Israel;2. Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, 76100, Israel;1. Laboratoire des Matériaux Ferroélectriques (LMF), LR-Physique-Mathématiques et Applications, Université de Sfax, Faculté des Sciences de Sfax (FSS), Route de Soukra km 3,5 B.P. 1171, 3000 Sfax, Tunisia;2. Laboratoire de Physique de la Matière Condensée (LPMC), Université de Picardie, Jules Verne, Pôle Scientifique, 33 rue Saint-Leu, 80039 Amiens Cedex 1, France;3. Laboratoire de la Matière Condensée et Nanostructures (LMCN), Université Cadi Ayyad, Faculté des Sciences et Techniques Gueliz (FSTG), Avenue Abdelkrim Khattabi – B.P. 549, Marrakech, Marocco;1. Departamento de Física, CCET, Universidade Federal do Maranhão, 65085-580, São Luís, MA, Brazil;2. Departamento de Química, CCET, Universidade Federal do Maranhão, 65085-580, São Luís, MA, Brazil;3. Departamento de Física, Universidade Federal do Ceará, Campus do Pici, 60455-760, Fortaleza, CE, Brazil;4. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States;5. Department of Materials Science and Engineering, University of California Berkeley, Berkeley, CA 94720-1760, United States;6. Department of Physics, University of California Berkeley, Berkeley, CA 94720-7300, United States;1. CaSiCCE Laboratory, ENP-Oran, B.P 1523 El M′Naouar, Oran 31000, Algeria;2. Ecole Préparatoire Sciences & Techniques, BP 474 - Place des Martyres, Alger, Algerie;3. Department of Physics, College of Science, Box 36, Sultan Qaboos University, Al Khoud 123, Oman;4. Universidade de Brasília, Instituto de Física, Núcleo de Física Aplicada, Brasília, DF 70910-900, Brazil;5. School of Physics and Astronomy, Nottingham University, NG72RD, United Kingdom |
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| Abstract: | The crystal structures and the microwave dielectric properties of the xSrTiO3–(1 − x)Ca(Mg1/3Nb2/3)O3 perovskite ceramic system have been investigated. In order to achieve a temperature-stable material, we studied a method of combining a positive temperature coefficient material with a negative one. SrTiO3 has dielectric properties of dielectric constant εr ∼ 205, Q × f value ∼ 4200 GHz and a large positive τf value ∼ 1700 ppm/°C. Ca(Mg1/3Nb2/3)O3 possesses high dielectric constant (εr ∼ 28), high quality factor (Q × f value ∼ 58,000 at 7 GHz) and negative τf value (− 48 ppm/°C). As the x value varies from 0.2 to 0.8, the xSrTiO3–(1 − x)Ca(Mg1/3Nb2/3)O3 system has the dielectric properties as follows: 40 < εr < 123, 4600 < Q × f < 33,400 and − 23 < τf < 600. A new microwave dielectric material, 0.3SrTiO3–0.7Ca(Mg1/3Nb2/3)O3, applicable in microwave devices is suggested and possesses the dielectric properties of a dielectric constant εr ∼ 46, a Q × f value ∼ 29,300 GHz (at 6.8 GHz) and a τf value ∼− 2 ppm/°C. A near-zero τf value can be achieved by adjusting the x value of xSrTiO3–(1 − x)Ca(Mg1/3Nb2/3)O3 ceramics. |
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