Improvement in the microwave dielectric properties of SrCa4Nb4TiO17 ceramics by Ba substitution

Bulletin of materials science

Yaseen Iqbal²  Abdul Manan¹ 

[1] Department of Physics, University of Science and Technology, Bannu, 28100 KPK, Pakistan$$Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120, KPK, Pakistan$$Department of Physics, University of Science and Technology, Bannu, 28100 KPK, PakistanDepartment of Physics, University of Science and Technology, Bannu, 28100 KPK, Pakistan$$Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120, KPK, Pakistan$$Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120, KPK, PakistanDepartment of Physics, University of Science and Technology, Bannu, 28100 KPK, Pakistan$$Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120, KPK, Pakistan$$;Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120, KPK, Pakistan$$Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120, KPK, PakistanMaterials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120, KPK, Pakistan$$

关键词: XRD;    processing;    phase;    ceramics.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Microwave dielectric ceramics in the Sr_{1â€�?�ð�?��?}Ba_ð‘�?Ca₄Nb₄TiO₁₇ (0 â‰�? ð‘�? â‰�? 0.75) composition series were fabricated via a solid-state mixed oxide route. All the compositions formed single phase in Sr_{1â€�?�ð�?��?}Ba_ð‘�?Ca₄Nb₄TiO₁₇ (0 â‰�? ð‘�? â‰�? 0.75) solid solutions within the detection limit of in-house X-ray diffraction (XRD). The sintered microstructure of these ceramics comprised densely packed elongated and plate-like grains. The dielectric properties varied linearly with ð‘�?. Relative permittivity (ðœ�?_r) increased from 47.2 to 54.5, unloaded quality factor multiplying the resonant frequency (ð‘�??_u ð‘�??_o) decreased from 11,984 to 9345 GHz and temperature coefficient of resonant frequency (𝜏_f) increased from â€�??78.6 to 20 ppm/°C with an increase in x from 0 to 0.75. In the present study, ðœ�?_r â‰�? 51.6, ð‘�??_u ð‘�??_o â‰�? 10,160 GHz (5.37 GHz) and 𝜏_f â‰�? â€�??13.5 ppm/°C were achieved for Sr_0.5Ba_0.5Ca₄Nb₄TiO₁₇ (ð‘�? = 0.5) ceramics.

【 授权许可】

Unknown