Strong negative thermal expansion in the hexagonal polymorph of ScF3†,CrystEngComm

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Strong negative thermal expansion in the hexagonal polymorph of ScF3†
CrystEngComm ( IF 3.1 ) Pub Date : 2018-03-14 00:00:00 , DOI: 10.1039/c8ce00257f
Igor A. Kasatkin _{1,

2,

3} , Larisa B. Gulina _{1,

2,

3} , Natalia V. Platonova _{1,

2,

3} , Valeri P. Tolstoy _{1,

2,

3} , Igor V. Murin _{1,

2,

3}

Affiliation

A new hexagonal polymorph of scandium fluoride (ScF₃) has been synthesized and thoroughly characterized. The new phase displays two types of negative thermal expansion in a wide temperature range at normal pressure: a relatively weak isotropic negative thermal expansion at low temperatures and a strong anisotropic negative thermal expansion above 500 K. The thermal behavior is explained in part by a model of static structure distortions.

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