Microwave dielectric properties of novel lithium containing pyrochlore type oxides: Li3Sm3 − xBixTi7Nb2O25 (x = 0, 1, 2 or 3) |
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| Affiliation: | 1. Regional Research Laboratory (CSIR), Thiruvananthapuram, 695 019, India;2. Department of Physics, Kerala University, Thiruvananthapuram, 695 581, India;1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. College of Information Science and Engineering, Guilin University of Technology, Guilin 541004, China;3. Novel Aerospace Materials Group, Faculty of Aerospace Engineering, Delft University of Technology, Delft 2629 HS, The Netherlands;1. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China;2. Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 430074, PR China;1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. College of Information Science and Engineering, Guilin University of Technology, Guilin 541004, China |
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| Abstract: | Microwave dielectric properties of novel lithium ion containing pyrochlore type oxides: Li3Sm3 − xBixTi7Nb2O25 (x = 0, 1, 2 or 3) have been reported in this paper. Powder X-ray diffraction patterns show that these oxides have cubic pyrochlore type structure. Ceramic microstructure of the sintered samples show well formed grains. They have relatively high dielectric constant (εr) in the range 80–137 at 1 MHz and εr, 45–83 at the resonant microwave frequency region. It is seen that the dielectric constant (εr) increases with the increase of Bi content. The best microwave dielectric properties obtained for fully substituted samarium compound, Li3Sm3Ti7Nb2O25 are as follows: Q × f = 2007 and εr = 45 at the resonant microwave frequency, 3.78 GHz. |
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