Effects of sintering temperatures on crystal structures, dielectric properties, and phonon characteristics of Sr2V2O7 2 V 2 O 7 microwave ceramics

被引:2
|
作者
Dong, Jingxuan [1 ]
Yu, Wenhao [2 ]
Yu, Yingbo [1 ]
An, Zhongfen [1 ]
Yao, Zhonghua [3 ]
Zhang, Lingcui [1 ]
Xu, Yue [1 ]
Liu, Hanxing [3 ]
Shi, Feng [1 ,2 ]
Qi, Ze-Ming [4 ]
机构
[1] Qilu Univ Technol, Shandong Acad Sci, Sch Mat Sci & Engn, Key Lab Proc & Testing Technol Glass & Funct Ceram, Jinan 250353, Peoples R China
[2] Shandong Univ Sci & Technol, Sch Mat Sci & Engn, Qingdao 266590, Peoples R China
[3] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China
[4] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China
基金
中国国家自然科学基金;
关键词
Microwave dielectric ceramics; Strontium vanadate; Crystal structure; Dielectric properties; Lattice dynamics;
D O I
10.1016/j.ceramint.2024.06.258
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Sr2V2O7 (SVO) microwave dielectric ceramics were fabricated through a conventional solid-state synthesis method and sintered at 900-1000 degrees C for 10 h. The crystal structures and morphologies of the SVO samples were examined via X-ray diffraction and scanning electron microscopy. These analyses revealed that the SVO sample sintered at 950 degrees C exhibited high crystallinity and a triclinic crystal system. Through the lens of lattice dynamics, the phonon characteristics of the SVO samples were investigated via Raman spectroscopy and far-infrared spectroscopy to elucidate the dielectric response mechanics and microstructural origins of these responses. Raman spectra were classified into three sections corresponding to the vibration of Sr2+ ions, the V-O or V-O-V telescopic vibration, and the internal elongation of the tetrahedral structure composed of V-O, respectively. The inherent dielectric properties obtained from the far-infrared spectra were analyzed using a four-parameter semiquantum model with the assistance of the Focus software. This analysis aligned with the measured property values. The relationships between the crystal structures and the dielectric properties were established using the Raman modes. Particularly, the SVO sample sintered at 950 degrees C exhibited excellent dielectric properties, characterized by a dielectric constant (epsilon r) of 9.49, a quality factor (Q x f) of 35,189 GHz, and a resonant frequency (f) of 12.48 GHz.
引用
收藏
页码:34395 / 34402
页数:8
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