VIBRATIONAL STUDIES OF 2 PHOSPHOTELLURATES - TE(OH)62(NH4)2HPO4 AND TE(OH)6NA2HPO4.H2O

IR and Raman spectra of the two phosphotellurates Te(OH)//62(NH//4)//2HPO//4 and Te(OH)//6Na//2HPO//4 multiplied by (times) H//2O have been analyzed on the basis of vibrations of HPO//4 **2** minus , TeO//6, NH//4** plus and H//2O groups. It has been found that the NH//4** plus ion rotates freely in the crystalline lattice. The splitting of the non-degenerate v//sPO//3 mode into two components suggests the possibility of resonance interaction between the HPO//4**2** minus ions in Te(OH)//6Na//2HPO//4 multiplied by (times) H//2O. The non-existence of H//30** plus plus ion in this crystal was also noticed.