A kind of rare earth palladium magnesium low temperature magnetic refrigeration material and its preparation method
A low-temperature magnetic refrigeration and rare earth technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of small magnetic entropy and commercial application limitations, and achieve significant magnetic entropy change, high magnetic refrigeration capacity, and easy implementation Effect
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Embodiment 1
[0030] Rare earth palladium magnesium low temperature magnetic refrigeration material, its chemical formula is: RE 4 -Pd-Mg, RE is Ho, and the atomic ratio Ho:Pd:Mg=4:1:1.
[0031] The preparation method of rare earth palladium magnesium low-temperature magnetic refrigeration material comprises the following steps:
[0032] Step 1, mixing ingredients:
[0033] According to the rare earth palladium magnesium low-temperature magnetic refrigeration material composition, 16.49g (0.1 mole) rare earth metal holmium, 2.66g (0.025 mole) metal palladium, 6.489g (0.025 mole) metal magnesium are evenly mixed into raw materials in an Ar gas glove box;
[0034] Step 2, inert gas closed environment:
[0035] Put the raw material in the quartz container, vacuumize the quartz container, the pressure in the quartz container is less than or equal to 1×10 - 2 Pa, filled with 0.76 atmospheres of argon, then the quartz container is closed;
[0036] Step 3, sintering:
[0037] (1) Put the qua...
Embodiment 2
[0048] Rare earth palladium magnesium low temperature magnetic refrigeration material, its chemical formula is: RE 4 -Pd-Mg, RE is Er, and the atomic ratio Er:Pd:Mg=4:1:1.
[0049] The preparation method of rare earth palladium magnesium low-temperature magnetic refrigeration material comprises the following steps:
[0050] Step 1, mixing ingredients:
[0051] According to the rare earth palladium magnesium low-temperature magnetic refrigeration material composition, 16.73g (0.1 mole) rare earth metal erbium, 2.66g (0.025 mole) metal palladium, 6.489g (0.025 mole) metal magnesium are uniformly mixed into raw materials in an Ar gas glove box;
[0052] Step 2, inert gas closed environment:
[0053] Put the raw material in the quartz container, vacuumize the quartz container, the pressure in the quartz container is less than or equal to 1×10 - 2 Pa, filled with 0.8 atmospheres of argon, then the quartz container is closed;
[0054] Step 3, sintering:
[0055](1) Put the qua...
Embodiment 3
[0066] Rare earth palladium magnesium low temperature magnetic refrigeration material, its chemical formula is: RE 4 -Pd-Mg, RE is Tm, in atomic ratio Tm:Pd:Mg=4:1:1.
[0067] The preparation method of rare earth palladium magnesium low-temperature magnetic refrigeration material comprises the following steps:
[0068] Step 1, mixing ingredients:
[0069] According to the composition of rare earth palladium magnesium low temperature magnetic refrigeration material, 16.89g (0.1 mole) rare earth metal thulium, 2.66g (0.025 mole) metal palladium, 6.489g (0.025 mole) metal magnesium are uniformly mixed into raw materials in an Ar gas glove box;
[0070] Step 2, inert gas closed environment:
[0071] Put the raw material in the quartz container, vacuumize the quartz container, the pressure in the quartz container is less than or equal to 1×10 - 2 Pa, filled with argon of 0.84 atmospheric pressure, then the quartz container is closed;
[0072] Step 3, sintering:
[0073] (1) P...
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