HIGH TEMPERATURE MATERIALS AND PROCESSES, vol.25, no.3, pp.143-147, 2006 (Journal Indexed in SCI)
This study gives the temperature dependence of the Raman frequencies for the lattice mode of upsilon(7) (TA) and the internal mode of upsilon(2) close to the X-phase transition (T-lambda=234K, P=\) in NB4Br.