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DyTiO3 single crystal material with low-magnetic-field giant magnetocaloric effect and preparation method thereof

A single crystal material, thermal effect technology, applied in the direction of polycrystalline material growth, single crystal growth, single crystal growth, etc., can solve the problems of complex structure and high cost of magnetic refrigeration system, achieve good chemical stability, low cost, relatively The effect of large cooling capacity

Inactive Publication Date: 2011-02-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the first approach can be solved by using superconducting magnets, but superconducting magnets make the structure of the magnetic refrigeration system complex and expensive, which has become a restrictive factor for the development of magnetic refrigeration technology

Method used

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  • DyTiO3 single crystal material with low-magnetic-field giant magnetocaloric effect and preparation method thereof
  • DyTiO3 single crystal material with low-magnetic-field giant magnetocaloric effect and preparation method thereof
  • DyTiO3 single crystal material with low-magnetic-field giant magnetocaloric effect and preparation method thereof

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specific Embodiment approach 1

[0013] Specific implementation mode 1: DyTiO with low magnetic field giant magnetocaloric effect in this implementation mode 3 Single crystal material by Dy 2 o 3 、TiO 2 and Ti powder according to the molar ratio of 1.5:2:1, the DyTiO with low magnetic field giant magnetocaloric effect 3 The single crystal material is DyTiO composed of Dysprosium, Titanium and Oxygen 3 Perovskite single crystal material.

[0014] DyTiO in this embodiment 3 M of perovskite single crystal material 2 The slope of the curve changing with H / M is positive; when the magnetic field changes at 1.5T, on the curve of magnetic entropy change changing with temperature, the absolute value of the maximum magnetic entropy change reaches 8.10J / kg K; when the magnetic field change is At 1.5T, the DyTiO of this embodiment 3 The relative refrigeration capacity RCP value of perovskite single crystal material reaches 123J / kg, and its magnetic phase transition is a second-order phase transition. The curve of ...

specific Embodiment approach 2

[0015] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the Dy 2 o 3 99.99% pure, TiO 2 The purity is 99.99%, and the purity of Ti powder is 99.99%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific embodiment three: DyTiO with low magnetic field giant magnetocaloric effect in this embodiment 3 The preparation method of single crystal material is as follows: 1, the Dy that purity is 99.99% 2 o 3 Sintering at 800°C for 6-8 hours, the TiO with a purity of 99.99% 2 Bake at 200°C for 4 to 5 hours; 2. Dy 2 o 3 、TiO 2 Mix with Ti powder according to the molar ratio of 1.5:2:1 and grind for 1 to 2 hours. The purity of Ti powder is 99.99%, and a uniformly mixed powder is obtained; 3. The powder obtained in step 2 is packed into a mold cavity and pressed into a diameter of Thin rods of 6 mm, and then the thin rods were grown in an Ar-H 2 mixed gas with a growth rate of 6-8 mm / h and a volume ratio of hydrogen to argon of 1:3. 3 Single crystal, that is, DyTiO with low magnetic field and giant magnetocaloric effect 3 single crystal material.

[0017] In this embodiment, the Vibrating Sample Magnetometer (VSM) option of the physical performance testing system (P...

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Abstract

The invention discloses a DyTiO3 single crystal material with a low-magnetic-field giant magnetocaloric effect and a preparation method thereof and belongs to the technical field of magnetic refrigeration materials. The invention aims to provide a high-chemical stability, high-electric resistance, high-magnetic entropy change, heat band-free, magnetic band-free and environmentally-friendly DyTiO3 single crystal material with the low-magnetic-field giant magnetocaloric effect and the preparation method thereof. The single crystal material is prepared from Dy2O3, TiO2 and Ti powder. The preparation method comprises the following steps of: sintering the Dy2O3 and baking the TiO2; grinding the processed Dy2O3 and TiO2 and the Ti powder, making a thin rod with the ground powder, growing DyTiO3 single crystals on the thin rod and obtaining the DyTiO3 single crystal material. The absolute value of the maximal magnetic entropy change of the DyTiO3 perovskite single crystal material reaches 8.10J / kgK under the condition of magnetic field change of 1.5T; and the relative cooling power (RCP) value of the DyTiO3 perovskite single crystal material reaches 123J / kg under the condition of magnetic field change of 1.5T.

Description

technical field [0001] The invention relates to the technical field of magnetic refrigeration materials, in particular to a single crystal material with low magnetic field giant magnetocaloric effect. Background technique [0002] In today's world, refrigeration technology plays a particularly important role, almost involving low temperature engineering, high energy physics, petrochemical industry, electric power and transportation, precision instrumentation, computing technology, superconducting technology, aerospace, medical equipment, agricultural production, food Storage and other scientific research, industry, agriculture and every field of daily life. At present, there are mainly three traditional refrigeration methods: (1) refrigeration by adiabatic expansion of high-pressure gas; (2) refrigeration by semiconductor thermoelectric effect; (3) refrigeration by phase change of substances. Traditional refrigeration methods and the refrigerant materials used in them have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B1/00
Inventor 隋郁苏彦涛王先杰程金光朱瑞滨王一
Owner HARBIN INST OF TECH