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High-pressure preparation method of quadrature-phase copper tellurium oxide

A technology of tellurium oxide and orthorhombic phase, which is applied in the field of synthesizing orthorhombic copper tellurium oxide to achieve the effects of simple operation, avoiding unnecessary impurities and high purity

Inactive Publication Date: 2020-08-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the use of high pressure preparation

Method used

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  • High-pressure preparation method of quadrature-phase copper tellurium oxide
  • High-pressure preparation method of quadrature-phase copper tellurium oxide
  • High-pressure preparation method of quadrature-phase copper tellurium oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0014] High-purity copper oxide (CuO), tellurium dioxide (TeO 2 ) is ground for 3 hours at a molar ratio of 3:1 as a raw material, fully mixed, and then put into a high-temperature muffle furnace for sintering after powder pressing and molding. phase precursors. Grind the cubic phase precursor into powder and put it into a high-pressure generating device, and the synthesis pressure is above 17GPa. Orthorhombic copper tellurium oxide (Cu 3 TeO 6 ) has the best degree of crystallization and the highest purity. For specific X-ray diffraction results, see figure 1 .

Embodiment 2

[0016] High-purity copper oxide (CuO), tellurium dioxide (TeO 2 ) is ground for 3 hours at a molar ratio of 3:1, mixed thoroughly, powder pressed into a high-temperature muffle furnace for sintering, the sintering temperature is 560°C, the holding time is 10 hours, and then naturally cooled to room temperature to obtain the precursor . Copper tellurium oxide (Cu 3 TeO 6 ) has a cubic structure, the specific X-ray diffraction results are shown in figure 2 .

Embodiment 3

[0018] High-purity copper oxide (CuO), tellurium dioxide (TeO 2 ) is ground for 3 hours at a molar ratio of 3:1 as a raw material, fully mixed, and after being pressed into powder by a hydraulic press, a boron nitride (BN) tube is first wrapped around the flake sample, then put into a graphite tube heating container, and finally put into In the pyrophyllite synthesis chamber, the synthesis pressure is 5GPa, the temperature is 850°C, and the pressure holding time is 30 minutes. After the heating is stopped, the sample is naturally cooled to room temperature and then the pressure is released. The main component of the compound prepared under this condition is unreacted heterophase, which does not contain any structural Cu 3 TeO 6 . For specific X-ray diffraction results, see image 3 . This example is used as a counterexample to illustrate that the orthorhombic phase Cu cannot be prepared under high temperature and high pressure conditions. 3 TeO 6 material.

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Abstract

The invention discloses a high-pressure preparation method of a quadrature-phase copper tellurium oxide, and belongs to the technical field of magnetic material preparation. The molecular formula of the copper tellurium oxide is Cu3TeO6, and the copper tellurium oxide has a monoclinic crystal structure. According to the preparation method, cubic-phase copper tellurium oxide formed by sintering copper oxide powder and tellurium dioxide powder is used as a precursor, synthesis is carried out on a high-pressure device, and the synthesis pressure is 17 GPa or above. The method disclosed by the invention is carried out in an anhydrous and modifier-free environment, so that unnecessary impurities can be avoided, and the purity of the obtained quadrature-phase copper tellurium oxide is high.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation. Specifically related to copper oxide (CuO), tellurium dioxide (TeO 2 ) as a raw material to prepare a cubic phase copper tellurium oxide precursor, and a method for synthesizing an orthorhombic phase copper tellurium oxide using a high pressure preparation technology. Background technique [0002] In many current research and application fields, magnetic materials are one of the essential materials. Among the magnetic materials currently being studied, there is a class of corundum-related compounds whose general chemical formula is M 3 TeO 6 Te and M atoms form TeO 6 Octahedral, significantly distorted MO 6 Octahedrons are arranged in a honeycomb shape between them. Different chemical compositions make corundum exhibit different material properties, not only for magnetic data storage devices, solar cells and polarization rotators, but also for multiferroic materials, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00B01J3/06
CPCC01B19/008B01J3/062C01P2002/30
Inventor 王欣董立辉陶强朱品文
Owner JILIN UNIV
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