Method for synthesizing barium carbonate iron monocrystal at high temperature and under high pressure

A high temperature, high pressure and high pressure synthesis technology, which is used in the field of high temperature and high pressure research in earth science

Inactive Publication Date: 2018-09-28
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for synthesizing barium iron carbonate single crystal under high temperature and high pressure, so as to solve the difficult problem that the current barium iron carbonate single crystal sample cannot be artificially synthesized

Method used

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Experimental program
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Effect test

Embodiment 1

[0032] A method for synthesizing barium iron carbonate single crystal under high temperature and high pressure, comprising the following steps:

[0033] Step 1, use analytically pure barium carbonate and synthetic ferrous carbonate to grind and mix uniformly as starting raw material with a molar ratio of 1:1, and the synthetic ferrous carbonate is prepared by utilizing high temperature and high pressure to directly decompose ferrous oxalate, and its reaction condition is 1GPa, 550℃, 1h;

[0034] Step 2. Use a tablet press to press the mixture powder in step 1, about 0.25g, into a cylindrical shape of Φ5×3mm, then wrap it with gold foil to make a sample, put the prepared sample in an h-BN tube, and press h -BN is the pressure transmission medium;

[0035] Step 3. Assemble the h-BN tube containing the sample in step 2 into a high-pressure synthesis assembly block and place it in a six-sided top press for high-temperature and high-pressure reaction. The temperature of the high-t...

Embodiment 2

[0047] A method for synthesizing barium iron carbonate single crystal under high temperature and high pressure, comprising the following steps:

[0048]Step 1, use analytically pure barium carbonate and synthetic ferrous carbonate to grind and mix uniformly as starting raw material with a molar ratio of 1:1, and the synthetic ferrous carbonate is prepared by utilizing high temperature and high pressure to directly decompose ferrous oxalate, and its reaction condition is 1GPa, 550℃, 1h;

[0049] Step 2. Use a tablet press to press the mixture powder in step 1, about 0.25g, into a cylindrical shape of Φ5×3mm, then wrap it with gold foil to make a sample, put the prepared sample in an h-BN tube, and press h -BN is the pressure transmission medium;

[0050] Step 3. Assemble the h-BN tube containing the sample in step 2 into a high-pressure synthesis assembly block and place it in a six-sided top press for high-temperature and high-pressure reaction. The temperature of the high-te...

Embodiment 3

[0062] A method for synthesizing barium iron carbonate single crystal under high temperature and high pressure, comprising the following steps:

[0063] Step 1, use analytically pure barium carbonate and synthetic ferrous carbonate to grind and mix uniformly as starting raw material with a molar ratio of 1:1, and the synthetic ferrous carbonate is prepared by utilizing high temperature and high pressure to directly decompose ferrous oxalate, and its reaction condition is 1GPa, 550℃, 1h;

[0064] Step 2. Use a tablet press to press the mixture powder in step 1, about 0.25g, into a cylindrical shape of Φ5×3mm, then wrap it with gold foil to make a sample, put the prepared sample in an h-BN tube, and press h -BN is the pressure transmission medium;

[0065] Step 3. Assemble the h-BN tube containing the sample in step 2 into a high-pressure synthesis assembly block and place it in a six-sided top press for high-temperature and high-pressure reaction. The temperature of the high-t...

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Abstract

The invention discloses a method for synthesizing barium carbonate iron monocrystal at high temperature and under high pressure. The method comprises the following steps: grinding and uniformly mixingthe analytic pure barium carbonate and the synthetic ferrous carbonate according to the molar ratio of 1:1 to serve as a starting raw material, performing high-temperature and high-pressure reactionfor 12 hours at 500 to 800 DEG C and under the pressure of 1 to 3 GPa to obtain a barium carbonate iron powder crystal sample, grinding and mixing the barium carbonate iron powder crystal sample and anhydrous oxalic acid according to the molar ratio of 1:0.1 to prepare a sample, and performing high-temperature and high-pressure reaction for 100 hours at 700 to 900 DEG C and under the pressure of 3GPa to prepare a barium carbonate iron monocrystal sample. The high-temperature and high-pressure method has the advantages that the operation process is simple and the experimental condition is easyto control; the obtained barium carbonate iron sample has the characteristics of high purity, high crystallinity degree, chemical stability, insusceptibility to water absorption and the like; and thetechnical problem that the existing method for artificially synthesizing the barium carbonate iron and growing the monocrystal has defectiveness is solved.

Description

technical field [0001] The invention relates to the field of high-temperature and high-pressure research in earth sciences, in particular to a method for synthesizing barium iron carbonate single crystals under high temperature and high pressure. Background technique [0002] In recent years, with the widespread concern of the protection of the earth's environment, the study of the structure and properties of carbonate minerals has become an important topic for exploring the earth's carbon storage, carbon cycle, greenhouse effect and fuel energy. Studies have shown that in addition to traditional calcite-type carbonate minerals, there are also double-carbonate minerals rich in heavy metal elements in nature, and their thermal stability and acid corrosion are important for the cycle of heavy metal elements on the earth's surface and the protection of environmental pollution, etc. The problem has extremely important research value. Compared with the simple crystal structure o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B1/12C30B1/10
CPCC30B1/10C30B1/12C30B29/22
Inventor 梁文李和平尹远李瑞李泽明刘喜强
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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