Synthesis, crystal structure, and characterization of Na2SrV4O12: A low‐firing dielectric vanadate

Li, Chunchun, Meng, Yingzhi, Hou, Hongping, Zhang, Amei, Khaliq, Jibran, Liao, Na, Fu, Caixia, Liu, Laijun and Du, Hongliang (2023) Synthesis, crystal structure, and characterization of Na2SrV4O12: A low‐firing dielectric vanadate. Journal of the American Ceramic Society, 106 (6). pp. 3501-3508. ISSN 0002-7820

Journal of the American Ceramic Society - 2023 - Li - Synthesis crystal structure and characterization of Na2SrV4O12 A.pdf - Accepted Version

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In this work, cyclotetravanadate Na2SrV4O12 was synthesized at a relatively low sintering temperature of ∼ 500 ° C using a solid-state reaction method. X-ray diffraction and transmission electron microscope characterization featured a tetragonal structure that was built by a 3D frame of isolated tetracyclic (V4O12)4−. Dielectric measurements demonstrated strong dependence on frequency and temperature. A low relative permittivity of εr ∼ 8 ± 0.2 and a dielectric (loss tanδ) ∼ 0.4 ± 0.01 was achieved at a frequency of 10 kHz and room temperature. ac impedance and conductivity analysis revealed a thermally activated migration behavior of charge carriers with a short-range hopping feature. XPS analysis validated the existence of oxygen vacancy and reduction in vanadium (from V5+ to V4+), which gave rise to charged lattice defects. The migration or hopping of such charged defects was responsible for the observed electrical behaviors. Owing to the simple composition, inexpensive raw materials, and low density (2.99 g/cm3) make Na2SrV4O12 ceramic a potential candidate for lightweight devices and in photocatalytic degradation and all-solid-state ion batteries.

Item Type: Article
Additional Information: Funding information: This work is supported by the Fundamental Research Funds of Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices (AFMD-KFJJ-21210) and Guangxi Key Laboratory Fund of Embedded Technology and Intelligent System (No. 2020-1-6),the Youth Innovation Team of Shaanxi Universities and Scientific Research Program Funded by Shaanxi Provincial Education Department (No. 21JK0869),Natural Science Basic Research Program of Shaanxi (Program No. 2023-JC-YB-441).
Uncontrolled Keywords: Ceramics; Dielectric properties; Low-temperature firing; Vanadate
Subjects: H700 Production and Manufacturing Engineering
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 09 Feb 2023 09:23
Last Modified: 09 Feb 2024 03:30

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