This standard specifies the determination method for the content of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide and titanium oxide in metallic neodymium and neodymium oxide. This standard applies to the simultaneous determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide, and yttrium oxide in metallic neodymium and neodymium oxide (80% to 98%). The measurement ranges are all from 0.30% to 10.00%.
GB/T 12690.7-1990 history
2021GB/T 12690.7-2021 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 7: Determination of silicon content
2003GB/T 12690.7-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of silicon content-Molybdenum blue spectrophotometric method