Preparation and calibration method of metalized germanium telluride under non-static pressure condition

Abstract

The invention discloses a preparation and calibration method of metalized germanium telluride under a non-static pressure condition. The preparation and calibration method comprises the following steps: respectively forming symmetrical round holes in alloy steel and beryllium copper of upper and lower supporting blocks of a four-column press; placing the diamond on a tungsten carbide base placed on the tool; fixing the lower part of the diamond and the tungsten carbide base; after baking, respectively arranging the two groups of diamonds and the base on four-column type diamond pressure cavity high-temperature and high-pressure experimental equipment; pre-pressing a T301 stainless steel metal gasket; putting boron nitride and epoxy resin insulation powder in a sample cavity, turning off the pressing machine for secondary pre-pressing, and drilling a circular hole in the center of the gasket sample cavity after secondary pre-pressing through the laser-beam drilling machine to serve as the sample cavity; putting high-purity solid semiconductor germanium telluride powder as an initial material into a sample cavity and closing the pressing machine; and performing pressurizing to 36.5 GPa, and keeping the pressure constant for 3.0 hours to obtain metalized germanium telluride. Technical problems that in the prior art, pressure points for preparing metal-phase germanium telluride are not clear, calibration is not accurate and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of functional material synthesis, in particular to a preparation and calibration method of metallized germanium telluride under non-static pressure conditions. Background technique [0002] Generally, a phase change material refers to a substance that can provide latent heat through a phase transition of physical properties under a given temperature condition. The phase transition process of physical nature is the phase transition process, and the material will absorb or release a large amount of latent heat during the phase transition process. Phase change materials are the best green carrier for energy saving and environmental protection. They are important functional materials that are of great concern to many international scientific research institutes and R&D institutions. They are widely used in human production activities and daily life. As one of the most typical important phase change materials, g...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation and calibration method for metallized germanium telluride under non-static pressure conditions, so as to solve the problem that the pressure point of germanium telluride for the preparation of metal phase in the prior art is not clear, the pressure is too low, and the The obtained product is a mixture of semiconductor phase and metal phase, rather than pure phase germanium telluride; on the contrary, the pressure is too high, and its cost will increase significantly, which is not conducive to the preparation of high-purity and stable performance germanium telluride phase change materials. And it is difficult to realize its industrial production; 2. The high-temperature and high-pressure device for sample calibration traditionally adopts piston cylinder type diamond-to-anvil high-temperature and high-pressure equipment. Since the sample cavity of the device is completely sealed, it is not conducive to the extraction of electrical property measurement lines. It is easy to cause sample short circuit in the process of high-voltage conductivity measurement, and it is not easy to be used as an effective calibration of the metallization behavior of materials; 3. Metallization is determined by synchrotron radiation X-ray diffraction under high pressure (<25GPa) conditions, high-pressure Raman spectroscopy, First-principle theoretical calculations and other methods cannot effectively predict the metal phase transition that may occur in GeGeTe under high pressure. At present, there is no effective method to perform system calibration on the metallization behavior of ZnTe in the metal phase.

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