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When the hollow silicate nanospheres were oxidized , the interior cavities were refilled with a Mn ( 3 ) O ( 4 ) phase segregated from the silicate phase , and the hollow structure reverted to the initial core - shell structure .
 Chemical: silicate; Chemical: Mn ( 3 ) O ( 4 ); Chemical: silicate
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: silicate; Chemical: Mn ( 3 ) O ( 4 ); Chemical: silicate