Pressure detection method based on metastable phase rare-earth nickel-based oxide

Abstract

The invention belongs to the field of ultrahigh pressure detection and relates to a pressure detection method based on a metastable phase rare-earth nickel-based oxide. According to the pressure detection method, a rare-earth nickel-based oxide with a thermodynamic metastable phase structure is used as a pressure sensitive material in a pressure detector; and pressure measurement in a high-pressure and ultrahigh-pressure spectral range is realized by utilizing a characteristic that the rare-earth nickel-based oxide changes sensitively along with pressure in the high-pressure and ultrahigh-pressure range and the relation of the change of resistivity and a resistance temperature coefficient along with pressure. Compared with previous pressure measuring methods, the method can realize pressure measurement in the spectral range, and realize the cross validation of pressure measurement in the high-pressure and ultrahigh-pressure range through the comprehensive characterization of the resistivity and a resistance temperature change rate, thereby greatly improving pressure measurement precision in the high-pressure range. The method of the invention can be further applied to the aspects of high-pressure detection, deep sea pressure measurement, geological pressure measurement and the like.

Description

technical field [0001] The invention belongs to the field of ultra-high pressure detection, and in particular relates to a pressure detection method based on a metastable phase rare earth nickel-based oxide. Background technique [0002] With the development of high-pressure science and technology, the use of diamond anvils and large-cavity high-pressure devices to study the properties of substances under high pressure and to synthesize new materials has become an important means of high-pressure research. The calibration of pressure in high-pressure experimental technology is the most important thing. It complements high-pressure physics and chemistry, promotes each other, and develops together. In the diamond counter-anvil pressure chamber, commonly used pressure calibration methods include the equation of state method, phase transition method, and spectroscopic method. [0003] The equation of state method generally selects some substances with relatively simple and stab...

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Problems solved by technology

But similarly, the diamond pressure scale also has its own shortcomings, generally the accuracy is poor at low pressure

[0005] However, it is undeniable that there is no proper full-spectrum calibrator for resistance indication in the field of high-pressure calibration at present. In addition, how to improve the reliability of pressure measurement in pressure measurement methods in the range of high pressure and ultra-high pressure has yet to be further resolved.

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