Method for synthesizing spherical siderite single crystal by using precursor at high temperature under high pressure
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A high-temperature, high-pressure, precursor technology, applied in the field of geoscience mineralogy research
Inactive Publication Date: 2019-07-09
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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Problems solved by technology
How to control the growth direction of the single crystal so that the siderite grows into a spherical shape according to the (001) direction is a technical problem that is currently difficult to solve for the growth of spherical siderite crystals
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Embodiment 1
[0026] A method of using precursors to synthesize spherical siderite single crystals under high temperature and high pressure, comprising the following steps:
[0027] Step 1, the synthesis of the precursor:
[0028] Step 1.1: Use analytically pure barium carbonate and synthetic ferrous carbonate to grind and mix uniformly at a molar ratio of 1:1 as starting materials;
[0029] Step 1.2: Use a tablet press to press the mixture powder in step 1 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 use h-BN as the pressure transmission medium;
[0030] Step 1.3: 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;
[0031] Step 1.4: Take out the sample after the reaction in step 3, peel off the gold foil, and grind it into powder to obtain the precursor of barium iron carb...
Embodiment 2
[0043] A method of using precursors to synthesize spherical siderite single crystals under high temperature and high pressure, comprising the following steps:
[0044] Step 1, the synthesis of the precursor:
[0045] Step 1.1: Use analytically pure barium carbonate and synthetic ferrous carbonate to grind and mix uniformly at a molar ratio of 1:1 as starting materials;
[0046] Step 1.2: Use a tablet press to press the mixture powder in step 1 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 use h-BN as the pressure transmission medium;
[0047] Step 1.3: 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;
[0048] Step 1.4: Take out the sample after the reaction in step 3, peel off the gold foil, and grind it into powder to obtain the precursor of barium iron carb...
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Abstract
The invention discloses a method for synthesizing a spherical siderite single crystal by using a precursor at high temperature under high pressure. The method comprises the following steps: firstly, uniformly grinding and mixing analytically pure barium carbonate and synthesized ferrous carbonate according to a molar ratio of 1:1, taking the mixture as an initial raw material to carry out a reaction at high temperature under high pressure to obtain a barium carbonate iron powder crystal precursor, then grinding and mixing the barium carbonate iron powder crystal precursor with anhydrous oxalicacid according to a molar ratio of 1:1, assembling the prepared sample in a high-pressure synthesis assembly block, and putting the sample into a huge cubic press to carry out a high-temperature high-pressure reaction to prepare the gold-yellow spherical siderite single-crystal sample. The invention solves the problem that the existing spherical siderite seed crystal cannot be artificially synthesized. The size of the spherical siderite single crystal obtained by the method is up to 200 microns, and a thick gold yellow color can be observed under a mineral phase mirror, so that requirements of spherical siderite gems to refractive index are met. In addition, the spherical siderite prepared by the method does not contain Ba impurities.
Description
technical field [0001] The invention relates to a method for synthesizing spherical siderite single crystals by using a precursor under high temperature and high pressure, and belongs to the field of earth science mineralogy research. Background technique [0002] Siderite is a carbonate mineral widely distributed in sedimentary rocks and metamorphic rocks, and is an important iron ore resource. The amorphous aggregates of natural siderite are coarse-grained, fine-grained, nodular, grape-like, and soil-like. In contrast, the single crystal output of natural siderite is less, and according to the crystal shape, it is divided into platy siderite and spherical siderite. Among them, platy siderite refers to a single crystal with a plate shape that develops along the (101) direction, and its cleavage surface is rhomboid, similar to calcite; spherical siderite refers to a spherical shape that develops along the (001) direction The single crystal has a regular triangular cleavage...
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