B-site high-entropy perovskite oxide Sr0.9La0.1MO3 ceramic and preparation method thereof

Abstract

The invention relates to a B-site high-entropy perovskite oxide Sr0.9La0.1MO3 ceramic and a preparation method thereof. The invention discloses a B-site high-entropy perovskite oxide which is prepared from SrCO3, La2O3, ZrO2, TiO2, SnO2, HfO2, Nb2O5, MnO2 and Bi2O3, and a preparation method of the B-site high-entropy perovskite oxide. The oxide is a pure-phase B-site high-entropy perovskite oxide Sr0.9La0.1MO3 (M is Zr, Ti, Sn, Hf, Mn or Nb), and the chemical formula of the material is Sr0.9La0.1(Zr1 / 4Ti1 / 4Sn1 / 4Hf1 / 4)O3, Sr0.9La0.1(Zr1 / 5Ti1 / 5Sn1 / 5Hf1 / 5Mn1 / 5)O3, and Sr0.9La0.1(Zr1 / 6Ti1 / 6Sn1 / 6Hf1 / 6Mn1 / 6Nb1 / 6)O3. The B-site high-entropy perovskite oxide Sr0.9La0.1MO3 has a single-phase perovskite structure, elements in the B-site high-entropy perovskite oxide Sr0.9La0.1MO3 are uniformly distributed and have no agglomeration phenomenon, and compared with SrTiO3 ceramic system with thermal conductivity of 12W / m.K, the B-site high-entropy perovskite oxide Sr0.9La0.1MO3 can effectively reduce the thermal conductivity and is suitable for the field of thermoelectric materials.

Description

technical field [0001] The invention relates to the field of high-entropy oxides, specifically a B-site high-entropy oxide Sr 0.9 La 0.1 MO 3 Ceramics and methods of making them. Background technique [0002] In 2004, the concept of "high-entropy alloys" (HEAs) was proposed. Cantor et al. prepared a single-phase multi-component alloy with stable configuration entropy for the first time. Since then, high-entropy engineering has been extensively studied in the field of alloys. Until 2015, entropically stable oxides (Mg 0.2 Zn 0.2 co 0.2 Cu 0.2 Zn 0.2 After )O was reported, the concept of high entropy entered the field of ceramics. Referring to and inheriting from high-entropy alloys, high-entropy ceramics are single-phase ceramics formed by four or more elements in accordance with the principle of equiatomic ratio or near equiatomic ratio. Due to the high mixing entropy among the components, it tends to form a solid solution, which makes it have high thermal stability...

AI Technical Summary

Problems solved by technology

In this paper, high-entropy perovskite oxides (La 0.2 Li 0.2 Ba 0.2 Sr 0.2 Ca 0.2 )TiO 3 , and its dielectric properties were studied, but the high-entropy perovskite oxide does not have thermoelectric properties, so it cannot be used in the field of thermoelectric materials

[0010] SrCO has not been seen so far 3 , La 2 o 3 , ZrO 2 、TiO 2 , SnO 2 , HfO 2 , Nb 2 o 5 , MnO 2 、 Bi 2 o 3 Preparation of high-entropy oxide Sr with perovskite structure 0.9 La 0.1 (Zr 1 / 4 Ti 1 / 4 sn 1 / 4 f 1 / 4 )O 3 , Sr 0.9 La 0.1 (Zr 1 / 5 Ti 1 / 5 sn 1 / 5 f 1 / 5 mn 1 / 5 )O 3 、Sr 0.9 La 0.1 (Zr 1 / 6 Ti 1 / 6 sn 1 / 6 f 1 / 6 mn 1 / 6 Nb 1 / 6 )O 3 Material related reports

Images