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This work elucidates the possible reasons for the outstanding , but never reproduced thermoelectric properties of the doped Ti ( 0 . 5 ) Zr ( 0 . 25 ) Hf ( 0 . 25 ) NiSn Heusler compounds .
 Chemical: Ti ( 0 . 5 ) Zr ( 0 . 25 ) Hf ( 0 . 25 ) NiSn
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Answer:
 Chemical: Ti ( 0 . 5 ) Zr ( 0 . 25 ) Hf ( 0 . 25 ) NiSn