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Structural changes in liquids between Al2O3 and Y2O3 are investigated as a function of the composition and during supercooling using high energy X - ray diffraction ( HEXRD ) techniques combined with containerless aerodynamic levitation .
 Chemical: Al2O3; Chemical: Y2O3
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Al2O3, Y2O3 
Answer:
 Chemical: Al2O3; Chemical: Y2O3