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The nuclear magnetic resonance (NMR) method was applied for tracking boron impurities in the refining process of metallurgical grade (MG) silicon. From the NMR signal of the 11B isotope at an operating temperature 4.2 K, the boron concentration can be estimated down to the order of 1–10 wppm B. After melting and resolidification of MG‐Si alloyed with Ca and Ti, a major fraction of B impurities remains...
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