Multiphase ceramic material with giant dielectric constant, and preparation method thereof

US12145887B2 · kind B2 · utility

Assignee

• GUANGDONG FENGHUA ADVANCED TECHNOLOGY HOLDING CO., LTD. · CN

Inventors

• Xiuhua Cao · Longbeilingcun, CN
• Jianmei Liu · Nanhu, CN
• Dehong Chen · Canberra, AU
• Haidong Ren · Longbeilingcun, CN
• Yun Liu · Zhuolan Township, TW
• Terry James Frankcombe · Tharwa, AU
• Zhenxiao Fu · Tangxia, CN
• Shiwo Ta · Tangxia, CN

Key dates

• Filing date: Mar 29, 2020
• Grant date: Nov 19, 2024
• Expiry date: Jul 27, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention discloses a multiphase ceramic material with a giant dielectric constant, wherein the multiphase ceramic material has a general formula of AxBnxTi1−(n+1)xO2; wherein A is at least one selected from the group consisting of Nb, Ta, V, Mo, and Sb, B is at least one selected from the group consisting of In, Ga, Al, Co, Cr, Sc, Fe (III), and a trivalent rare-earth cation; n is a molar ratio of B to A, 1<n≤5, 0<x≤0.1. The multiphase ceramic material possesses outstanding properties including a giant dielectric constant, a low dielectric loss, and excellent frequency- and temperature-stability. In particular, it exhibits a high insulation resistivity of higher than 1011Ω·cm and a high breakdown voltage, which implies it can be applied in high-energy storage devices and supercapacitors. This invention also provides a method to synthesize the multiphase ceramic material.