Strong negative thermal expansion in the hexagonal polymorph of ScF3†
Igor A.
Kasatkin, 
*a
Larisa B.
Gulina,
a
Natalia V.
Platonova,
a
Valeri P.
Tolstoy
a
and
Igor V.
Murin
a
*a
Larisa B.
Gulina,
a
Natalia V.
Platonova,
a
Valeri P.
Tolstoy
a
and
Igor V.
Murin
a
Abstract
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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