Phase structure, bond traits, and intrinsic dielectric response of NiTa2O6–TiO2 microwave dielectric ceramics investigated by bond theory and vibrational spectroscopy

Hongyu Yang; Liang Chai; Chengzhi Xu; Zhimin Li; Zhichao Hu; Mengjiang Xing; Enzhu Li

Journal of Materials Research and Technology (Jul 2023)

Phase structure, bond traits, and intrinsic dielectric response of NiTa2O6–TiO2 microwave dielectric ceramics investigated by bond theory and vibrational spectroscopy

Hongyu Yang,
Liang Chai,
Chengzhi Xu,
Zhimin Li,
Zhichao Hu,
Mengjiang Xing,
Enzhu Li

Affiliations

Hongyu Yang: Academy of Advanced Interdisciplinary Research, Xidian University, Xi'an, 710071, PR China; Corresponding author.
Liang Chai: Academy of Advanced Interdisciplinary Research, Xidian University, Xi'an, 710071, PR China
Chengzhi Xu: School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, 710071, PR China
Zhimin Li: School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, 710071, PR China
Zhichao Hu: National Engineering Research Center of Electromagnetic Radiation Control Materials and Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, 610054, PR China
Mengjiang Xing: National Engineering Research Center of Electromagnetic Radiation Control Materials and Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, 610054, PR China; Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001, PR China
Enzhu Li: National Engineering Research Center of Electromagnetic Radiation Control Materials and Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, 610054, PR China; Corresponding author.

Journal volume & issue: Vol. 25
pp. 1364 – 1375

Abstract

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The present work reports the synthesis and structure-property of a tri-rutile Ni0.5Ti0.5TaO4 microwave dielectric ceramic. It is found that the Ni0.5Ti0.5TaO4 ceramic belongs to the solid solution of tetragonal tri-rutile NiTa2O6. Based on Raman spectroscopy and group theory prediction, the A1g Raman-active mode in 702.4 cm−1, belonging to the synergistic vibration of Ti/Ta2 cations and O anion, dominates the Raman-active vibrations. The intrinsic factor to the microwave dielectric traits is studied using the dielectric theory of crystal structure and infrared reflective spectroscopy from the aspect of the crystal structure. The dielectric loss of Ni0.5Ti0.5TaO4 ceramic at the microwave range originates from the absorption of structural phonon oscillation, discovering the micro-polarization mechanism. Also, the contributions of chemical bonds, especially the importance of Ti/Ta2 cation to the chemical bond susceptibility and structural lattice stability, are reflected. Accordingly, the Ti site was partially replaced by the (Al0.5Nb0.5)4+ complex cation, which improved the microwave dielectric performances with an increase of Q × f value ∼ 39%.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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