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6H-phase perovskite BaCrO3 crystal and preparation method thereof

A perovskite and crystal technology, which is applied in the field of 6H phase BaCrO3 crystal and its preparation, can solve the problems of impurities and compound property barriers.

Inactive Publication Date: 2011-01-05
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This series of compounds is inevitably accompanied by CrO during the synthesis process using alkaline earth metal oxides as starting materials 2 The decomposition of synthetic samples will always contain impurities, which is a big obstacle to the study of the properties of compounds

Method used

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  • 6H-phase perovskite BaCrO3 crystal and preparation method thereof
  • 6H-phase perovskite BaCrO3 crystal and preparation method thereof
  • 6H-phase perovskite BaCrO3 crystal and preparation method thereof

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Effect test

Embodiment 1

[0028] (1) Synthesis of single-phase 6H-phase perovskite BaCrO3 crystals under high temperature and high pressure.

[0029] Analytical pure BaO raw material (>97%) and high-purity CrO 2 The raw materials are weighed, mixed, and evenly ground in a glove box filled with Ar atmosphere according to the molar ratio of 1.2:1, and then pressed into small discs with a diameter of 6 mm and a height of about 3-5 mm, wrapped with gold foil, and packaged in a Φ8 ×15mm boron nitride cylinder. Put the pressed sample into the graphite furnace and put it into the high-pressure assembly of the six-sided top press for high-pressure synthesis. Before the high-pressure experiment, the temperature and pressure are first calibrated, and the heating temperature is controlled by controlling the heating power. First, slowly increase the pressure in the graphite furnace to 6GPa at room temperature, then start the heating program and heat to 1000°C, keep it warm for 30 minutes under high temperature an...

Embodiment 2

[0036] Except step (3) high pressure adopts 17GPa, temperature adopts 1100 ℃, except that insulation is kept for 30 minutes, all the other are the same as embodiment 2.

Embodiment 3

[0038] Except step (3) high pressure adopts 18GPa, temperature adopts 1100 ℃, except that insulation is kept for 60 minutes, all the other are the same as embodiment 1.

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Abstract

The invention discloses a 6H-phase perovskite BaCrO3 crystal and a preparation method thereof. In the invention, a 4H-phase BaCrO3 is synthetized by utilizing BaO and CrO2 at high temperature and high pressure; then the 6H phase of the other single phase of the BaCrO3 is obtained further through a two-step method of treating the 4H-phase BaCrO3 at the higher pressure to convert the 4H-phase BaCrO3 into the 6H-phase perovskite BaCrO3, which provides possibility for further researching the properties of various phases of the BaCrO3.

Description

technical field [0001] The invention relates to a 6H phase BaCrO obtained by reacting under high temperature and high pressure conditions. 3 Crystal and its preparation method, especially a 6H phase BaCrO prepared by two-step method under high pressure high temperature and ultra high pressure high temperature conditions 3 Crystals and methods for their preparation. Background technique [0002] Due to Cr 4+ Fluctuation of chemical bond valence, with ACrO 3 (A is an alkaline earth metal ion) form of perovskite compounds cannot be synthesized under normal pressure, and must be synthesized under extreme conditions of high temperature and high pressure. Due to their extreme synthetic conditions, people have seldom studied them, and their properties have not been fully studied. This series of compounds is inevitably accompanied by CrO during the synthesis process using alkaline earth metal oxides as starting materials 2 Decomposition, synthesis samples will always contain im...

Claims

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Application Information

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IPC IPC(8): C30B29/24C30B1/12B01J3/06
Inventor 吕玉玺刘青清靳常青
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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