In view of the lack of sulphide capacity data for iron oxide-bearing slags that are of great importance in metallurgical processes, the present work was initiated to study the sulphide capacities of "FeO"-Si02-"FeO"-CaO,and "FeO"-MnO melts. The melts were equilibrated with a gas mixture of CO, C02, S02and
Sodium metavanadate (NaV03) has been reported earlier to exhibit ferroelectric behaviour below 380 "C, but unlike many other known ferroelectrics it does not show a very strong dielectric anomaly, indicating that the structural change during the ferroelectric phase transition may be only a slight modification of the paraelectric phase. This is in conformity with the x-ray data at room temperature, which could he refined to the same R value either in space group C2ic or Cc. Further, it is known that NaVO, occurs also in another polymorphic modification (&form), the structure of which has not been established. Raman spectroscopic studies of single crystals of the a-form of NaV03 have been carried out and a crystalline powder of the j3-form has been made. The Raman spectra have been interpreted in terms of the linear VO; chains formed by VO, tetrahedra sharing two corners with each other. The temperature variation of the intensity and width of the Raman lines through the phase transition has been measured and the observed LO-TO splitting in the room temperature phase confirm the Cc ferroelectric space group.
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