Spectroscopic and electrical studies of silver sulfophosphate glasses

Formation and structure of ionic (Na, Zn) sulfophosphate glasses

“…Best-fit deconvolution of the spectra into Gaussian peaks hints to a weak third resonance located at δ~− 10 ppm, strongly overlapped by the Q 1 -peak. We attribute this resonance to P-OH-groups, caused by the presence of water in the glass structure [30,37]. No further peaks are present.…”

“…In particular, no features could be found in the NMR-spectra which would indicate polymerization of SO 4 2-groups or S-O-P linkages. Especially the presence of [O 3 POSO 3 ] 3-groups as has been suggested in lithium sulfophosphate glasses [30] cannot be confirmed. With increasing ZnSO 4 -concentration, a small but experimentally significant shift towards lower δ is observed in the position of the Q 1 -resonance ( Fig.…”

“…Whereas during the discovery of sulfophosphate glasses, initially, sulfate solubility appears to have been the major subject of interest, already shortly after Mamoshin et al's first reports, low T g and softening temperature became primary targets. In this context, glass formation has now been studied in, e.g., Na 2 SO 4 -ZnSO 4 -NaPO 3 [15] , Na 2 O-SiO 2 (P 2 O 5 )-SO 3 [17], [18], ZnSO 4 -KPO 3 -NaPO 3 , Li 2 SO 4 -Na 2 SO 4 -K 2 SO 4 [16], xS:(1-x)AgPO 3 [30], Na 2 SO 4 -P 2 O 5 -H 2 O [19], SrSO 4 -KPO 3 -Na 2 B 4 O 7 [20] and Li 2 O-Li 2 SO 4 -P 2 O 5 [31,32]. In various cases, it has been shown that homogeneous glasses with T g b 330°C can be prepared at melting temperatures of b800°C without the necessity of specifically high cooling rates [11].…”

Dielectric dispersion and spectroscopic investigations on Na2SO4–B2O3–P2O5 glasses mixed with low concentrations of TiO2

“…Such weak and variable interaction between these two ions is expected to influence the electrical properties to a large extent. A considerable number of previous studies on a variety of physical properties of different alkali sulfophosphate glasses are available in the literature [6][7][8][9]. The introduction of B 2 O 3 to alkali sulfophosphate glasses is expected to increase the thermal stability of the glass network (since borate groups form M + [BO 4 ] − pairs) and also reported to increase the electrical conductivity [10][11][12][13].…”

Alkyne hydrogenation using Pd–Ag hybrid nanocatalysts in surface‐immobilized dendrimers

“…[31] It should be noted that the interpretation of the silver spectra is complicated due to overlapping of the binding energy signals that are typical of each of three common valence states of silver: Ag 0 (367.9-368.4 eV), Ag 2 O (367.6-368.5 eV) and Ag I Ag III O 2 (367.3-368.1 eV). [32][33][34][35] The silver oxide signals are negatively shifted due to decreasing binding energy relative to the Ag 0 state. [36,37] Reduction with sodium borohydride results in an increase of the zero-valent forms of silver and, especially, palladium.…”