High-dielectric constant voltage-resistant rare earth-doped strontium titanate ceramic and preparation method thereof

Abstract

The invention discloses high-dielectric constant voltage-resistant rare earth-doped strontium titanate ceramic. The high-dielectric constant voltage-resistant rare earth-doped strontium titanate ceramic has a general chemical formula of NdxSr1-1.5xTiO3, wherein x represents the mole number of Nd and is greater than 0 and less than or equal to 0.2. The invention also discloses a preparation method of the high-dielectric constant voltage-resistant rare earth-doped strontium titanate ceramic. The preparation method obviously improves a relative dielectric constant of a strontium titanate ceramic product, guarantees and improves dielectric strength of the strontium titanate ceramic product, realizes the technical breakthrough of a strontium titanate ceramic system material, effectively improves energy storage density and comprehensive performances of the strontium titanate ceramic product, develops an application range of the strontium titanate ceramic system material as a high-voltage energy-storage dielectric material, and greatly improves popularization and application of the strontium titanate ceramic system material.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a strontium titanate ceramic and a preparation method thereof. Background technique [0002] Strontium titanate (SrTiO 3 ) ceramics is an important functional material, widely used in electronics, machinery industry and other fields. At room temperature, strontium titanate ceramics have a cubic phase structure and are paraelectric, with a high relative permittivity (ε r ~300), and because it is not like ferroelectric ceramics (such as BaTiO 3 ) such that there is instability of the domain wall inside, so strontium titanate ceramics also have a high withstand voltage strength (E when the sample thickness is 1.0±0.05mm b ~10kV / mm), thus having high ε r and E b unique properties. For this reason, in recent years, strontium titanate-based ceramics are considered to be one of the solid-state energy storage medium material systems with great development potential. ...

AI Technical Summary

Problems solved by technology

However, since the relative permittivity and withstand voltage strength of dielectric materials are a pair of relatively contradictory parameters, the research on strontium titanate-based ceramic energy storage materials has not made breakthrough progress. At the same time as the electrical constant, the withstand voltage strength is significantly reduced; and in the case of ensuring the withstand voltage strength, the relative permittivity cannot be significantly improved

Therefore, it is difficult to effectively increase the energy storage density of strontium titanate-based ceramics in the prior art, and its comprehensive performance has also been greatly affected, thereby limiting the scope of use of strontium titanate-based ceramics, and its promotion and application have also been hindered

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