Tetrahydroxy gadolinium oxide dihydrate and preparation and applications thereof
The technology of dihydrated gadolinium tetrahydroxide and hydrated digadolinium tetrahydroxide is applied in the field of preparation and application of dihydrated gadolinium tetrahydroxide, which can solve the problems of low efficiency, destroying the ozone layer and the like, and achieves simple synthesis device, The effect of good thermal stability and strong stability
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Embodiment 1
[0026] The preparation process of the rare earth gadolinium magnetic refrigeration material containing hydroxyl complexes: 0.25 mmol of gadolinium nitrate hexahydrate, 0.33 mmol of sodium formate dihydrate and 0.08 mmol of glycine were dissolved in 15 mL of deionized water. Stir the solution constantly, and adjust the pH to about 6.7 with fresh ammonia water (concentration 1mol / L). Transfer the solution to a 23mL polytetrafluoroethylene-lined pressure-resistant stainless steel reactor, raise the temperature to 160°C at a rate of 35°C / h and keep the temperature constant for 4000min, then slowly cool down to room temperature at a rate of 2°C / h, filter and wash to obtain Colorless needle-like crystals.
Embodiment 2
[0028] Sample Characterization:
[0029] 1. Single crystal test:
[0030] The single crystal sample structure of rare earth gadolinium magnetic refrigeration materials containing hydroxyl complexes was collected by Agilent Super Nova Diffractometer X-ray single crystal diffractometer at 100K. figure 1 and 2 is the crystal structure diagram of digadolinium tetrahydroxide dihydrate.
[0031] 2. Rare earth gadolinium magnetic refrigeration material containing hydroxyl coordination: it belongs to the orthorhombic crystal system, the space group Cmcm, and the molecular formula is Gd 2 O(OH) 4 (H 2 O) 2 , the unit cell parameters are a=16.5835, b=12.9747, c=7.3106, V=1573.05. Its structural coordination mode is as figure 2 As shown, each asymmetric unit contains 1 Gd 3+ Ion, 1 / 2 O 2- Ion, 2 OH - ions and 1 water molecule. There are two crystallographically independent Gd 3+ ions (Gd1 and Gd2), Gd1 is eight-coordinated with six μ 3 -OH - , a μ 3 -O 2- and an H 2 O c...
Embodiment 3
[0035] magnetic test
[0036] Quantum Design SQUID MPMS magnetometer was used to test the rare earth gadolinium-containing magnetic refrigeration materials with hydroxyl coordination in the temperature range of 2-300K and the external magnetic field conditions of 1000Oe. Figure 4 It is the variable temperature magnetic susceptibility diagram of rare earth gadolinium-containing magnetic refrigeration materials with hydroxyl coordination. And the test is carried out in the temperature range of 2-10K and the magnetic field of 0-7T. Figure 5 It is the magnetization intensity diagram of the variable temperature and variable field of the rare earth gadolinium-containing magnetic refrigeration material with hydroxyl coordination. Figure 6 It is the magnetic entropy change diagram of rare earth gadolinium-containing magnetic refrigeration materials with hydroxyl coordination.
[0037] Figure 4 It shows that at room temperature, the rare earth gadolinium-containing magnetic refr...
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