Cas号7440-10-0分子式Pr分子量140.90别名PraseodymiumMetal外观AppearancedarkgreyingotorrodinoilX-射线衍射分析X-RayDiffractionConformstoStructure纯度Purity≥99.9%BasedonTraceMetalsImpuritiesofICPICPAssayConfirmsPraeseodymiumcomponent痕量金属分析totalmetallicimpurities≤2000ppmbyICPAtomicemission)