A kind of high temperature and high pressure synthesis of trigonal strontium calcium carbonate srca (co 3 ) 2 Methods

Abstract

The invention discloses and provides a high-temperature and high-pressure synthetic trigonal strontium calcium carbonate SrCa(CO 3 ) 2 method using analytically pure strontium carbonate SrCO 3 and analytically pure calcium carbonate CaCO 3 The trigonal strontium calcium carbonate Sr(CO 3 ) 2 . The high temperature and high pressure reaction conditions are 0.5GPa, 700°C, and quenching after maintaining pressure and heat preservation for 6h. The first synthesis of strontium calcium carbonate SrCa (CO 3 ) 2 The trigonal phase is proved to exist stably and the boundary conditions of temperature and pressure are given, which solves the technical problems of current mineralogical research.

Description

technical field

[0001] The invention relates to the research field of earth science mineralogy, and relates to a high-temperature and high-pressure synthetic trigonal strontium calcium carbonate SrCa(CO 3 ) 2 Methods. Background technique

[0002] Carbonate minerals are widely distributed on the earth. According to the structure-component classification, simple carbonate minerals are divided into calcite type and aragonite type: calcite type The main four end members are magnesite MgCO 3 , siderite FeCO 3 , Rhodochrosite MnCO 3 and calcite CaCO 3 Composition; Aragonite-type main four-terminal element is composed of aragonite CaCO 3 , strontium carbonate ore SrCO 3 , white lead ore PbCO 3 And poison barite BaCO 3 constitute. Under complex geological conditions such as sedimentation and metamorphism, calcite-type and aragonite-type carbonates can form composite bicarbonates with more complex structures. At present, the poison barite BaCO 3 The formed barium-containi...

Examples

Embodiment

[0018] A high temperature and high pressure synthesis of trigonal strontium calcium carbonate SrCa(CO 3 ) 2 method, including the following steps:

[0019] Step 1. Use analytically pure strontium carbonate SrCO 3 and analytically pure calcium carbonate CaCO 3 Take the molar ratio of 1:1 to grind and mix uniformly as the starting material;

[0020] Step 2. Use a tablet press to press the mixture powder in step 1 into a Φ5×3mm cylindrical shape, wrap the cylindrical sample with 0.02mm thick gold foil and place it in a h-BN tube as a sample, using h-BN as the pressure transmission medium;

[0021] Step 3. Assemble the h-BN tube containing the sample in step 2 in a high-pressure synthesis assembly block and place it in a six-sided top large press for high-temperature and high-pressure reaction. The high-temperature and high-pressure reaction conditions are 0.5GPa, 700 ° C, and keep After quenching under pressure and holding for 6 hours, the pressure is quickly released to nor...

technical field

[0001] The invention relates to the research field of earth science mineralogy, and relates to a high-temperature and high-pressure synthetic trigonal strontium calcium carbonate SrCa(CO 3 ) 2 Methods. Background technique

[0002] Carbonate minerals are widely distributed on the earth. According to the structure-component classification, simple carbonate minerals are divided into calcite type and aragonite type: calcite type The main four end members are magnesite MgCO 3 , siderite FeCO 3 , Rhodochrosite MnCO 3 and calcite CaCO 3 Composition; Aragonite-type main four-terminal element is composed of aragonite CaCO 3 , strontium carbonate ore SrCO 3 , white lead ore PbCO 3 And poison barite BaCO 3 constitute. Under complex geological conditions such as sedimentation and metamorphism, calcite-type and aragonite-type carbonates can form composite bicarbonates with more complex structures. At present, the poison barite BaCO 3 The formed barium-containi...

Examples

Embodiment

[0018] A high temperature and high pressure synthesis of trigonal strontium calcium carbonate SrCa(CO 3 ) 2 method, including the following steps:

[0019] Step 1. Use analytically pure strontium carbonate SrCO 3 and analytically pure calcium carbonate CaCO 3 Take the molar ratio of 1:1 to grind and mix uniformly as the starting material;

[0020] Step 2. Use a tablet press to press the mixture powder in step 1 into a Φ5×3mm cylindrical shape, wrap the cylindrical sample with 0.02mm thick gold foil and place it in a h-BN tube as a sample, using h-BN as the pressure transmission medium;

[0021] Step 3. Assemble the h-BN tube containing the sample in step 2 in a high-pressure synthesis assembly block and place it in a six-sided top large press for high-temperature and high-pressure reaction. The high-temperature and high-pressure reaction conditions are 0.5GPa, 700 ° C, and keep After quenching under pressure and holding for 6 hours, the pressure is quickly released to nor...