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Chemical synthesis of Nd2Fe14B nanoparticles is challenging due to the large reduction potential of Nd ( 3 + ) and the high tendency for Nd2Fe14B oxidation .
 Chemical: Nd2Fe14B; Chemical: Nd ( 3 + ); Chemical: Nd2Fe14B
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Nd2Fe14B; Chemical: Nd ( 3 + ); Chemical: Nd2Fe14B