FTIR and XPS studies of P 2O 5–Na 2O–CuO glasses

Abstract

The short range structure of ternary sodium–copper–phosphate [(40–70)P 2O 5–(0–60)Na 2O–(0–50)CuO (mol%)] samples were examined by Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The XPS O 1s spectrum was deconvoluted into three components, symmetric bridging oxygen (P–O–P), non-bridging oxygen ( and PO) and asymmetric bridging oxygen (P–O–Cu). In the ultraphosphate and metaphosphate glasses, the P–O–Cu bonds are formed replacing bonds while keeping the same fraction of P–O–P bonds as Na 2O is replaced by CuO. Whereas, in the polyphosphate glasses, the formation of P–O–Cu will replace both P–O–P and 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.