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Measuring system and measuring method of Curie temperature of substance under high pressure

A Curie temperature and measurement system technology, applied in the investigation stage/state change, etc., can solve the problem of no detection, etc., and achieve the effect of widening the range and synchronizing real-time measurement

Inactive Publication Date: 2017-08-15
JILIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Most of the current Curie temperature measurements are carried out under normal pressure conditions, and there is no detection of special environments

Method used

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  • Measuring system and measuring method of Curie temperature of substance under high pressure
  • Measuring system and measuring method of Curie temperature of substance under high pressure
  • Measuring system and measuring method of Curie temperature of substance under high pressure

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Embodiment Construction

[0043] Such as figure 1 , Figure 1b As shown, the measurement system for the Curie temperature of substances under high pressure in the present invention includes: an external control part, a signal detection part, a signal measurement part, and a signal acquisition and processing part.

[0044] Such as figure 1 , Figure 1b , Figure 2a , Figure 2b , image 3As shown, the external control part is used for heating the sample 1, generating high voltage and generating a DC magnetic field; this part includes a laser 11, an electromagnet, and a diamond counter-anvil 13. The diamond counter-anvil 13 includes diamonds 131 , 132 , diamond holders 133 , 134 , and a metal gasket 135 .

[0045] The signal detection part is equivalent to a sensor, which is used to convert the magnetic susceptibility signal of the sample 1 into a voltage signal; it includes an excitation coil 21 , an induction coil 22 , a compensation coil 23 and an AC source 24 .

[0046] The sample 1 is place...

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Abstract

The invention relates to a measuring system and measuring method of the Curie temperature of a substance under high pressure. In the system, a sample is placed in a sample cavity in the center of a metal gasket of a diamond anvil cell, and the sample is compacted by two diamonds of the diamond anvil cell; the light beam of a laser device is focused to the sample through the diamond anvil cell; an excitation coil is connected with two electrodes of an alternating current source, and an induction coil is arranged on one diamond of the diamond anvil cell in a sleeved mode and is close to the sample; a compensating coil and the induction coil are arranged in parallel in the excitation coil and are reversely connected in series; a lock-in amplifier is provided with reference signals by the alternating current source, and simultaneously receives, amplifies and detects the magnetic induction signals of the induction coil and the compensating coil; a sample temperature measuring device is arranged in a position close to the sample; and the outputs of the lock-in amplifier and the sample temperature measuring device are connected to a signal acquisition and processing device. The measuring system and measuring method realize measurement of the Curie temperature point of the substance under high pressure, and widen the range of measurable parameters by magnetic measurement under high pressure.

Description

technical field [0001] The invention belongs to the technical field of measuring the Curie temperature of a substance, and relates to a measuring system and a method for measuring the Curie temperature of a substance under high pressure. Background technique [0002] At present, high-pressure science and technology is an emerging discipline that is in the stage of accelerated development. As an experimental platform for studying the structure and properties of materials, it has become one of the important means. Under the action of high pressure, the crystal structure of the substance will change, and the properties of the substance will also change accordingly. Matter sometimes undergoes phase transitions. High-pressure science thus broadens the scope of research in disciplines such as materials science, astronomy, and geology. [0003] Curie temperature is also called Curie point or magnetic transition point. It refers to the critical point at which ferromagnetic substa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/12
CPCG01N25/12
Inventor 张涛李政韩冰陈祥文
Owner JILIN UNIV
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