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

A detection method, a metastable phase technology, applied in the direction of fluid pressure measurement through thermal devices, fluid pressure measurement by changing ohmic resistance, measurement of fluid pressure, etc., which can solve problems such as poor accuracy

Active Publication Date: 2019-08-20
UNIV OF SCI & TECH BEIJING +1
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  • Application Information

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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

Method used

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

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Effect test

Embodiment 1

[0020] Embodiment 1: adopt thermodynamic metastable phase rare earth nickel-based perovskite oxide shirt nickel oxide (SmNiO 3 ) as a pressure-sensitive material, its X-ray diffraction pattern is as follows figure 1 shown. Such as figure 2 As shown, the resistivity decreases with the increase of pressure at room temperature, and the resistivity pressure change relationship is used as a reference in the actual pressure measurement process. Put the pressure-sensitive material under a certain isostatic pressure, measure the resistivity under the pressure, and compare with figure 2 The pressure-temperature curves of the resistivity shown are compared to obtain a measurement of the pressure value. Further, using a local heating device to increase the temperature of the pressure sensitive layer by 2 degrees, and measuring its resistivity value again, the relationship between the calculated resistance change rate with temperature and the resistivity temperature change of the pre...

Embodiment 2

[0021] Embodiment 2: Adopt thermodynamic metastable phase rare earth nickel-based perovskite oxide europium nickel oxide (EuNiO 3 ) as a pressure-sensitive material, its resistivity decreases with the increase of pressure at room temperature, and the resistivity-pressure relationship is used as a reference in the actual pressure measurement process. Put the pressure-sensitive material under a certain isostatic pressure, measure the resistivity under the pressure, and compare it with the resistivity pressure-temperature curve, so as to obtain the pressure value measurement. Further, using a local heating device to raise the temperature of the pressure sensitive layer by 3 degrees, and measuring its resistivity value again, the calculated resistance change rate with temperature is compared with the reference value of the resistivity temperature change relationship of the pressure sensitive layer under different pressures. Comparison, so as to realize the second confirmation of t...

Embodiment 3

[0022] Embodiment 3: Adopt thermodynamic metastable phase rare earth nickel-based perovskite oxide gadolinium nickel oxide (GdNiO 3) as a pressure-sensitive material, its resistivity decreases with the increase of pressure at room temperature, and the resistivity-pressure relationship is used as a reference in the actual pressure measurement process. Put the pressure-sensitive material under a certain isostatic pressure, measure the resistivity under the pressure, and compare it with the resistivity pressure-temperature curve, so as to obtain the pressure value measurement. Further, use a local heating device to raise the temperature of the pressure sensitive layer by 5 degrees, and measure its resistivity value again, and compare the calculated resistance change rate with temperature with the reference value of the resistivity temperature change relationship of the pressure sensitive layer under different pressures. Comparison, so as to realize the second confirmation of the ...

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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...

Claims

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Application Information

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IPC IPC(8): G01L1/18G01L9/06G01L1/00G01L11/00
CPCG01L1/00G01L1/18G01L9/06G01L11/002
Inventor 陈吉堃董洪亮陈志强姜勇
Owner UNIV OF SCI & TECH BEIJING
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