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A method for growing siderite single crystals under high temperature and high pressure

A high temperature and high pressure, siderite technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., to achieve good pressure transmission performance, clean laboratory environment, and good chemical stability

Inactive Publication Date: 2019-06-11
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a method for growing siderite single crystals under high temperature and high pressure, so as to solve the difficult technical problem of siderite single crystal growth at present. Easy to control and other features

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Using analytically pure ferric oxide powder and anhydrous oxalic acid as starting materials, the raw materials are ground and mixed uniformly at a stoichiometric molar ratio of 1:1.5, and the mixture (about 0.25 g) is finally compressed into a cylinder ( Φ5mm×3mm), the cylindrical sample is stuffed into a Φ5mm, 0.1mm thick platinum tube, and both ends are sealed with a welding torch. Using h-BN as the pressure transmission medium, place the platinum-sealed sample in the h-BN tube: drill a Φ5mm hole in the center of the h-BN rod with a size of Φ10mm on the lathe to make the h-BN tube, and place the platinum-sealed sample Put it into the tube, and seal the two ends with h-BN sheets with a thickness of Φ5mm and a thickness of 2mm to complete the high-pressure assembly block. High voltage assembly block assembly method:

[0047] ① A circular through hole with a diameter of 12mm is drilled in the center of a 32×32mm pyrophyllite block;

[0048] ② A graphite heating furnace...

Embodiment 2

[0053] Using analytically pure ferric oxide powder and anhydrous oxalic acid as starting materials, the raw materials are ground and mixed uniformly at a stoichiometric molar ratio of 1:1.5, and the mixture (about 0.25 g) is finally compressed into a cylinder ( Φ5mm×3mm), the cylindrical sample is stuffed into a Φ5mm, 0.1mm thick platinum tube, and both ends are sealed with a welding torch. Using h-BN as the pressure transmission medium, place the platinum-sealed sample in the h-BN tube: drill a Φ5mm hole in the center of the h-BN rod with a size of Φ10mm on the lathe to make the h-BN tube, and place the platinum-sealed sample Put it into the tube, and seal the two ends with h-BN sheets with a thickness of Φ5mm and a thickness of 2mm to complete the high-pressure assembly block. High voltage assembly block assembly method:

[0054] ① A circular through hole with a diameter of 12mm is drilled in the center of a 32×32mm pyrophyllite block;

[0055] ② A graphite heating furnace...

Embodiment 3

[0060] Using analytically pure ferric oxide powder and anhydrous oxalic acid as starting materials, the raw materials are ground and mixed uniformly at a stoichiometric molar ratio of 1:1.5, and the mixture (about 0.25 g) is finally compressed into a cylinder ( Φ5mm×3mm), the cylindrical sample is stuffed into a Φ5mm, 0.1mm thick platinum tube, and both ends are sealed with a welding torch. Using h-BN as the pressure transmission medium, place the platinum-sealed sample in the h-BN tube: drill a Φ5mm hole in the center of the h-BN rod with a size of Φ10mm on the lathe to make the h-BN tube, and place the platinum-sealed sample Put it into the tube, and seal the two ends with h-BN sheets with a thickness of Φ5mm and a thickness of 2mm to complete the high-pressure assembly block. High voltage assembly block assembly method:

[0061] ① A circular through hole with a diameter of 12mm is drilled in the center of a 32×32mm pyrophyllite block;

[0062] ② A graphite heating furnace...

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Abstract

The invention discloses a method used for growth of spathic iron ore monocrystal at high temperature under high pressure. According to the method, analytically pure ferric oxide powder and anhydrous oxalic acid are weighed, grinded, and uniformly mixed at a molar ratio of 1:1.5; an obtained mixture is pressed into a cylinder-shaped sample using a tablet press; the cylinder-shaped sample is introduced into a platinum tube, and the two ends of the platinum tube are sealed using a welding gun; h-BN is taken as a pressure transmitting medium, the sample sealed in the platinum tube is placed in a h-BN tube; assembling of the sample in the h-BN tube with a high pressure synthesized assembled block is carried out, and the sample and the high pressure synthesized assembled block are introduced into an enlarged cubic press for high temperature high pressure reaction; after reaction, the sample is taken out from the h-BN tube, the platinum tube is unsealed using a diamond knife, natural airing is carried out, spathic iron ore monocrystals are selected under a microscope, wherein the obtained spathic iron ore monocrystals shape like rhombic sheets, the average size ranges from 50 to 100<mu>m,and the largest size is as large as 200<mu>m. The method is capable of solving technical problems in the prior art that siderite monocrystal growth is difficult to realize, experimental operation issimple, and the experimental conditions are convenient to control.

Description

Technical field: [0001] The invention relates to the field of mineral material synthesis, in particular to a method for growing siderite single crystals under high temperature and high pressure. Background technique: [0002] In recent years, the greenhouse gas CO 2 Entering the atmosphere, causing global warming has attracted widespread attention. Carbonate minerals are the largest carbon pool in the earth’s sphere, and their circulation in the earth system affects the global carbon cycle system. Therefore, the carbon in sedimentary rocks It is especially important to study the stability of salt minerals and the morphology of their existence. Magnesite is considered to be a form of carbon storage that exists stably in the deep part of the earth. Studies have shown that magnesite that exists in the lower mantle is often associated with siderite (FeCO 3 ) isomorphous to form ferromagnesite. Although ferromagnesite can maintain structural stability with its inherent trigona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B1/12
CPCC30B1/12C30B29/22
Inventor 梁文李和平李泽明尹远李瑞
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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