16199
Upon long - term aging and additional thermal treatment , fcc undergoes a tetragonal distortion and subsequently transforms to bcc phase , and simultaneously , the NPs embedded in supercrystals reduce surface energy primarily in { 200 } facets .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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