Abstract
It has been found that the (011) and (031) twin planes observed in tris-sarcosine calcium chloride (TSCC) can be moved by an appropriate external stress just like those found recently in (NH 4 ) 2 SO 4 . The ferroelastic properties of TSCC in the orthorhombic phase can be explained if the existence of a hypothetical hexagonal phase is assumed just as in the case of (NH 4 ) 2 SO 4 . The space group of the hypothetical phase is inferred to be D 6h 3 –P6 3 /mcm, in which sarcosine molecules are in disordered state, occupying either one of two stable states with equal probability.
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