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Diamond anvil cell pressurizing method capable of providing high static loading capacity

A technology of diamond anvil and static loading, applied in the direction of applying stable tension/pressure to test the strength of materials, teaching models, instruments, etc., can solve the problems of diamond-BC8 phase transition damage, etc., to promote development and expand stress The effect of loading range

Active Publication Date: 2021-11-19
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is: in view of the diamond anvil in the form of isostatic compression in the prior art can only withstand the load of 1000-1100GPa, and the problem that the diamond-BC8 phase transition will occur when the stress is higher than this range and cause damage, proposes A Diamond-Anvil Pressurization Method Provides High Static Loading Capability

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  • Diamond anvil cell pressurizing method capable of providing high static loading capacity
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  • Diamond anvil cell pressurizing method capable of providing high static loading capacity

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specific Embodiment approach 1

[0070] Specific implementation mode one: refer to figure 1 and figure 2 This embodiment is described in detail. A diamond-anvil pressurization method that provides high static loading capacity described in this embodiment includes the following steps:

[0071] By adjusting the orientation angle α at least once 1 、α 2 and the normal stress σ of the diamond [111] orientation [111] , make 1100GPa[111] ≤1700GPa (considering the error, the final value is 1100GPa[111] ≤1800GPa), direction angle α 1 and alpha 2 Satisfy:

[0072]

[0073] Among them, α 1 = α 2 , 0°1 2 [111] is the normal stress of the diamond [111] crystal orientation, and the orientation angle α 1 is the origin O in the crystal system, diamond normal stress and the normal stress σ of the diamond [111] orientation [111] The angle between the [111] crystal direction and the hypotenuse in the formed right triangle, the direction angle α 2 is the origin O in the crystal system, diamond normal stress ...

specific Embodiment approach 2

[0075] Embodiment 2: This embodiment is a further description of Embodiment 1. The difference between this embodiment and Embodiment 1 is to adjust the direction angle α 1 and alpha 2 The step of pre-compressing the diamond is also included before;

[0076] The specific steps of pre-compressing the diamond are as follows: first, slowly load along the diamond [111] crystal direction by compression, and gradually increase the pressure during the loading process, so that the strain of the diamond [111] crystal direction is 2-5%. After holding for 1 minute, gradually remove the compressive load;

[0077] The compression method includes a uniaxial static load compression method and an isostatic compression method;

[0078] The uniaxial static load compression method, namely locking α 1 = 0°, α 2 = 0°;

[0079] The isostatic compression method, namely locking α 1 = 45°, α 2 = 45°.

[0080] The diamond is pre-compressed to avoid the damage of the anvil head and the reduction ...

specific Embodiment approach 3

[0081] Embodiment 3: This embodiment is a further description of Embodiment 2. The difference between this embodiment and Embodiment 2 is that the steps of the pressurization method are as follows:

[0082] Step 1: Through uniaxial static load compression, that is, to lock α 1 = 0°, α 2 = 0°, slowly load along the diamond [111] crystal direction; during the loading process, gradually increase the force of the diamond [111] crystal direction, so that the normal stress σ of the diamond [111] crystal direction [111] Reach 60GPa, at this time, the strain of the diamond [111] crystal direction is 4%; after holding for 1 minute, gradually remove the compressive load, so that the normal stress of the diamond [111] crystal direction is reduced to 0;

[0083] Step 2: Through the uniaxial static load compression method, that is, α 1 = 0°, α 2 = 0°, slowly load along the diamond [111] crystal direction; during the loading process, gradually increase the force of the diamond [111] crys...

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Abstract

The invention discloses a diamond anvil cell pressurizing method capable of providing the high static loading capacity, relates to the technical field of high-pressure experimental equipment, and aims to solve problems that a diamond anvil head stressed in an isostatic pressure compression form in the prior art can only bear a load of 1000-1100 GPa, and a diamond-BC8 phase is changed to cause damage when the stress is higher than the range. The maximum pressure intensity borne by the crystal orientation of the diamond [111] can be 1700 GPa. In other words, the diamond anvil cell can provide the maximum loading capacity of 1700 GPa. The maximum loading capacity of the anvil cell is nearly 700 GPa higher than that of an existing anvil cell, the stress loading range of existing in-situ static high-pressure measuring equipment can be effectively expanded, and development of related technologies of high-pressure physics is obviously promoted.

Description

technical field [0001] The invention relates to the technical field of high-pressure experimental equipment, in particular to a diamond anvil pressurization method providing high static loading capacity. Background technique [0002] The anvil with diamond as the anvil head is the basic equipment of the current high-pressure physical in-situ measurement equipment. The static loading capacity of this type of equipment is related to the force form of the anvil head material—diamond. In the existing theory, the maximum static loading stress that can be provided by an anvil using diamond as the anvil head is a pressure of 1000-1100 GPa. The reason is that the existing theories related to the static loading capacity of diamond only consider the two stress forms of uniaxial compression strength and isostatic pressure. In the form of isostatic compression, it can withstand a load of 1000-1100GPa. If the stress is higher than this range, the diamond-BC8 phase transition will occur ...

Claims

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Application Information

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IPC IPC(8): G01N3/12G09B23/10
CPCG01N3/12G09B23/10G01N2203/0019G01N2203/0048
Inventor 李青坤李志远
Owner HEILONGJIANG UNIV
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