论文信息 - Ferroelasticity and Hypothetical Hexagonal-Orthorhombic Phase Transition in (CH3NHCH2COOH)3·CaCl2

Ferroelasticity and Hypothetical Hexagonal-Orthorhombic Phase Transition in (CH3NHCH2COOH)3·CaCl2

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.

Y. Takagi | A. Sawada | Y. Makita

[1] Y. Takagi,et al. The Origin of Mechanical Twins in (NH4)2SO4 , 1976 .

[2] Y. Takagi,et al. Twin Plane Motion in (NH4)2SO4 , 1976 .

[3] W. Windsch. Paramagnetic resonance studies in ferroelectric tris-sarcosine calcium chloride , 1976 .

[4] T. Ashida,et al. The crystal structure of trissarcosine calcium chloride , 1972 .

[5] W. C. Hamilton,et al. NEUTRON-DIFFRACTION STUDY OF THE STRUCTURES OF FERROELECTRIC AND PARAELECTRIC AMMONIUM SULFATE , 1966 .

[6] Makita Yasuharu. Ferroelectricity in (CH3NHCH2COOH)3·CaCl2 , 1965 .