16453
The process consisted of Nd - Fe - B mixed oxide preparation by microwave assisted combustion , followed by the reduction of the mixed oxide by CaH2 .
 Chemical: Nd - Fe - B; Chemical: oxide; Chemical: oxide; Chemical: CaH2
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: Nd - Fe - B; Chemical: oxide; Chemical: oxide; Chemical: CaH2