FTIR and XPS studies of P2O5-Na2O-CuO glasses

The short range structure of ternary sodium-copper-phosphate [(40-70)P2O5-(0-60)Na2O-(0-50)CuO (mol%)] samples were examined by Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The XPS O Is spectrum was deconvoluted into three components, symmetric bridging oxygen (P-O-P), nonbridging oxygen (P - O- and P=O) and asymmetric bridging oxygen (P-O-Cu). In the ultraphosphate and metaphosphate glasses, the P-O-Cu bonds are formed replacing P - O-Na+ bonds while keeping the same fraction of P-O-P bonds as Na2O is replaced by CuO. Whereas, in the polyphosphate glasses,the formation of P-O-Cu will replace both P-O-P and P - O-Na+ bonds. The results reveal the formation of P-O-Cu bonds in these glasses, and an increase of crosslink density. Thus, chemical durability and T-g of the glasses are increased. (C) 1999 Elsevier Science B.V. All rights reserved.