V M Padmanabhan
Articles written in Pramana – Journal of Physics
Volume 6 Issue 2 February 1976 pp 94-101 Solids
Neutron diffraction study of ammonium tartrate (NH4)2C4H4O6
A neutron diffraction study of ammonium tartrate has been carried out. Using the diffractometer in symmetrical setting, intensities of 750 reflections have been measured. The positions of all the hydrogen atoms have been determined. A good agreement is noticed between the present neutron and the earlier x-ray heavy atom parameters. The tartrate ion consists of two nearly identical planar halves, with an interplanar angle of 62°. Tre structure is stabilized by a net-work of hydrogen bonds. Details of hydrogen bonding and the ammonium ions environment are discussed.
Volume 19 Issue 6 December 1982 pp 593-632 Solid State Physics
Neutron, x-ray and lattice dynamical studies of paraelectric Sb2S3
K R Rao S L Chaplot V M Padmanabhan P R Vijayaraghavan
Neutron and x-ray diffraction studies of Sb2S3 indicate extensive diffuse scattering in the plane perpendicular to the chain axis of polymer-like (Sb4S6)
The phonon dispersion relation shows that there are rather flat TA-TO branches of very low frequency in the
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