Crystal structure and ferroelectric evidences of BaZnSi3O8 low‐permittivity microwave dielectric ceramic

2021 ◽  
Author(s):  
Zheng-Yu Zou ◽  
Xiao-Qiang Song ◽  
Lei Jiang ◽  
Chang-Lai Yuan ◽  
Wen-Zhong Lu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Microwave Dielectric Ceramic ◽  
Dielectric Ceramic ◽  
Microwave Dielectric ◽  
Low Permittivity

Temperature compensation effects of TiO2 on Ca[(Li1/3Nb2/3)0.8Sn0.2]O3−δ microwave dielectric ceramic

2017 ◽  
Vol 31 (27) ◽  
pp. 1750192
Author(s):  
Mingzhe Hu ◽  
Huanghe Wei ◽  
Lihua Xiao ◽  
Kesheng Zhang ◽  
Yongde Hao
Keyword(s):  
Crystal Structure ◽  
Dielectric Properties ◽  
Perovskite Phase ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric Ceramic ◽  
Microwave Ceramics ◽  
Dielectric Ceramic ◽  
Structure Transition ◽  
Microwave Dielectric ◽  
Dielectric Devices

The crystal structure and dielectric properties of TiO2-modified Ca[(Li[Formula: see text]Nb[Formula: see text])[Formula: see text]Sn[Formula: see text]]O[Formula: see text] microwave ceramics are investigated in the present paper. The crystal structure is probed by XRD patterns and their Rietveld refinement, results show that a single perovskite phase is formed in TiO2-modified Ca[(Li[Formula: see text]Nb[Formula: see text])[Formula: see text]Sn[Formula: see text]]O[Formula: see text] ceramics with the crystal structure belonging to the orthorhombic Pbnm 62 space group. Raman spectra results indicate that the [Formula: see text]-site order–disorder structure transition is a key point to the dielectric loss of TiO2-modified Ca[(Li[Formula: see text]Nb[Formula: see text])[Formula: see text]Sn[Formula: see text]]O[Formula: see text] ceramics at microwave frequencies. After properly modified by TiO2, the large negative temperature coefficient of Ca[(Li[Formula: see text]Nb[Formula: see text])[Formula: see text]Sn[Formula: see text]]O[Formula: see text] ceramic can be compensated and the optimal microwave dielectric properties can reach [Formula: see text] = 25.66, [Formula: see text] = 18,894 GHz and TCF = −6.3 ppm/[Formula: see text]C when sintered at 1170[Formula: see text]C for 2.5 h, which manifests itself for potential use in microwave dielectric devices for modern wireless communication.

Structure and infrared reflectivity spectra of novel Mg3Ga2GeO8 microwave dielectric ceramic with high Q

2021 ◽  
Vol 47 (2) ◽  
pp. 2450-2455
Author(s):  
Aihong Yang ◽  
Ying Tang ◽  
Jie Li ◽  
Weishuang Fang ◽  
Qianbiao Du ◽  
...  
Keyword(s):  
Microwave Dielectric Ceramic ◽  
Dielectric Ceramic ◽  
High Q ◽  
Infrared Reflectivity ◽  
Microwave Dielectric ◽  
Reflectivity Spectra
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