Preparation method for iron-based super conductor
A technology of iron powder and compaction, which is applied in the field of preparation of iron-based superconductors, can solve the problems of low sample density, low phase purity, poor grain connectivity, etc. performance effect
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Embodiment 1
[0025] Step 1: In an argon atmosphere glove box, Fe powder and As powder are mixed according to the molar ratio of 1:1, 0.9384 g of Fe powder and 1.259 g of As powder are weighed, and fully mixed. Fill the powder into a mold, press it into a block with a hydraulic press, put it into a quartz tube, and vacuum seal it. The quartz tube was placed in an annealing furnace and kept at 800°C for 20 hours. After the furnace was cooled to room temperature, it was taken out to obtain FeAs.
[0026] Step 2: In an argon atmosphere glove box, mix K chips and FeAs powder in a molar ratio of 1:2, weigh 0.1643 grams of K chips and 1.0987 grams of FeAs powder, mix well, fill the powder into a mold, and press it with a hydraulic press Into a block, put it into a quartz tube, and vacuum seal it. Place the quartz tube in an annealing furnace and keep it at 700°C for 20 hours. After the furnace is cooled to room temperature, it is taken out to obtain KFe 2 As 2 .
[0027] Step 3: In an argon...
Embodiment 2
[0031] Step 1: In an argon atmosphere glove box, Fe powder and As powder are mixed according to the molar ratio of 1:1, 1.0575 g of Fe powder and 1.4189 g of As powder are weighed and fully mixed. Fill the powder into a mold, press it into a block with a hydraulic press, put it into a quartz tube, and vacuum seal it. The quartz tube was placed in an annealing furnace and kept at 800°C for 20 hours. After the furnace was cooled to room temperature, it was taken out to obtain FeAs.
[0032] Step 2: In an argon atmosphere glove box, put Na chips and FeAs powder in a molar ratio of 1:2, weigh 0.1089 grams of Na chips and 1.2382 grams of FeAs powder, mix well, fill the powder into a mold, and press it with a hydraulic press Into a block, put it into a quartz tube, and vacuum seal it. Place the quartz tube in an annealing furnace and keep it at 700°C for 20 hours. After the furnace is cooled to room temperature, it is taken out to obtain NaFe 2 As 2 .
[0033] Step 3: In an ar...
Embodiment 3
[0037] Step 1: In an argon atmosphere glove box, Fe powder and As powder are mixed according to the molar ratio of 1:1, 0.941567 g of Fe powder and 1.263319 g of As powder are weighed, and fully mixed. Fill the powder into a mold, press it into a block with a hydraulic press, put it into a quartz tube, and vacuum seal it. The quartz tube was placed in an annealing furnace and kept at 800°C for 20 hours. After the furnace was cooled to room temperature, it was taken out to obtain FeAs.
[0038] Step 2: In an argon atmosphere glove box, Ni powder and As powder are mixed according to the molar ratio of 1:1, 0.1746 g of Ni powder and 0.2230 g of As powder are weighed, and fully mixed. Fill the powder into a mold, press it into a block with a hydraulic press, put it into a quartz tube, and vacuum seal it. The quartz tube was placed in an annealing furnace and kept at 800°C for 20 hours. After the furnace was cooled to room temperature, it was taken out to obtain NiAs.
[0039] ...
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