Na2CaV4O12: A low-temperature-firing dielectric with lightweight, low relative permittivity, and dielectric anomaly around 515 C

Liu, Caige, Wu, Shuangfeng, Liu, Laijun, Lei, Xiuyun, Xu, Jungu, Khaliq, Jibran and Li, Chunchun (2022) Na2CaV4O12: A low-temperature-firing dielectric with lightweight, low relative permittivity, and dielectric anomaly around 515 C. Ceramics International, 48 (5). pp. 6899-6904. ISSN 0272-8842

[img] Text
CERI-D-21-09737_R2.pdf - Accepted Version
Restricted to Repository staff only until 3 December 2022.
Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0.

Download (1MB) | Request a copy
Official URL: https://doi.org/10.1016/j.ceramint.2021.11.244

Abstract

A low temperature fired Na2CaV4O12 ceramic was synthesized via a solid-state reaction route at a temperature range of 350–550 °C. The Thermal analysis confirmed the densification and melting temperature of Na2CaV4O12 to be 530 °C and 580 °C, respectively. Dielectric properties together with the electrical conductivity were characterized at a broad frequency and temperature range. A super-low relative permittivity of εr = 7.72 and loss tangent of tanδ = 0.06 were obtained at 1 MHz at room temperature. A dielectric anomaly peak took place around 515 °C, which was associated with the phase transition from P4/nbm to P 4‾ b2. Ac impedance spectrum coupled with complex modulus plots unveiled the electrical conduction mechanism, which was dominated by the short-range movement of the charge carriers at low temperatures (T ≤ 220 °C) however long-range migration of charge carriers emerged at higher temperatures.

Item Type: Article
Additional Information: Funding Information: The authors gratefully acknowledge the financial support from the Natural Science Foundation of China (No. 62061011 ), Natural Science Foundation of Guangxi Zhuang Autonomous Region (No. 2018GXNSFAA281253 ), and the high-level innovation team and outstanding scholar program of Guangxi institutes.
Uncontrolled Keywords: Ac impedance spectrum, Ceramics, Dielectric properties, Thermal analysis
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 01 Mar 2022 15:27
Last Modified: 01 Mar 2022 15:30
URI: http://nrl.northumbria.ac.uk/id/eprint/48581

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics