Neutron diffraction study on paraelectric NaH3(SeO3)2

Abstract

The room temperature crystal structure of paraelectric NaH3(SeO3)2 has been refined by the full-matrix least-squares method using 353 three-dimensional neutron intensity data. The protons appear to be located in shallow or double potential wells with a large thermal-vibrational amplitude, (u2ii)½ = 0.30Å, nearly parallel to the line connecting the appropriate oxygen atoms.