| 简介 |
PROBLEM TO BE SOLVED : To provide a technique capable of providing, both efficiently and stably, a high-purity neodymium, a sputtering target comprising a high-purity neodymium, and a thin film for a rare earth magnet using a high-purity neodymium as a component.
SOLUTION : In a method for manufacturing a high-purity neodymium having a gas component-excluded purity of 4N5 or higher, a neodymium batch having a purity of 4N or higher is prepared by reducing, with distilled calcium, a raw neodymium fluoride ingredient having a gas component-excluded purity of 4N or higher, and after the neodymium has been skull-melted and then cooled gradually so as to prepare a neodymium ingot, the obtained skull ingot is cut so as to remove therefrom a bottom portion in which a segregated oxide layer segment exists, and the remaining neodymium ingot is melted with electron beams so as to remove therefrom volatile substances. The method for manufacturing a high-purity neodymium stipulates a C content of 100 wt.ppm or less, an O content of 50 wt.ppm or less, Al and Fe contents of 10 wt.ppm or less each, and a Cu content of 1 wt.ppm or less.
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