The structure of germanosilicate glasses, studied by X-ray photoelectron spectroscopy

Smets, B. M. J.; Lommen, T.P.A.

doi:10.1016/0022-3093(81)90071-5

Cited by 69 publications

(38 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(a) for caesium germanate glasses. The broadening of the O 1s peak was previously reported in the literature for sodium, 3 potassium 3,9 and rubidium germanate glasses. 9,10 Here, the Ge 3d peak was also found to broaden in sodium and caesium germanate glasses, with its FWHM varying from ¾1.8 eV for pure GeO 2 glass to ¾2.4 eV for the high-alkali glasses [see Fig.…”

Section: Resultsmentioning

confidence: 64%

“…The XPS spectra of sodium germanate glasses were similar to those in the literature. 3,11 As a general observation, all O 1s peaks broadened with increasing alkali contents in the alkali germanate glasses, with the FWHM varying from a minimum of 1.8 eV to a maximum of ¾2.8 eV. A series of oxygen peaks are superimposed in Fig.…”

Section: Resultsmentioning

confidence: 94%

“…In fact, XPS has proved to be a powerful technique for the quantification of BO and NBO atoms in glasses 1,2 and has been employed successfully in the study of many oxide glasses. 3,4 Alkali germanate glasses have been investigated by several authors in order to explain the so-called germanate anomaly. This anomaly manifests itself in the non-linear behaviour that some physical properties of germanate glasses show upon the addition of increasing alkali oxide contents: namely, the density and the refractive index of alkali germanate glasses exhibit maxima at ¾15-20 mol.% M 2 O (M D Li, Na, K, Rb and Cs), with the actual compositions depending on the alkali species.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

X‐ray photoelectron spectroscopy of alkali germanate glasses

Martino

Santos

Almeida

et al. 2002

Surface & Interface Analysis

View full text Add to dashboard Cite

Several alkali germanate glasses of molar composition (100 − x)GeO 2 ·xM 2 O (M = Na, with 0 x 35, or M = Cs, with 0 x 30) were prepared by melting, and their XPS spectra were recorded and analysed as a function of the alkali content. The simultaneous presence of bridging oxygen (BO) and non-bridging oxygen (NBO) atoms was evaluated in both glass systems. In order to clarify the role of the alkali ions on the formation of NBO species, a series of different alkali germanate glasses were analysed (M = Na, K, Rb, Cs) for a particular glass composition 70GeO 2 ·30M 2 O. This comparison revealed that the percentage of NBO atoms increased upon insertion of the heavier alkali ions. Some explanations are proposed to account for the ways in which the different alkali ions modify the structure of these germanate glasses, in connection with the so-called germanate anomaly.

show abstract

Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

X‐ray photoelectron spectroscopy of alkali germanate glasses

Martino

Santos

Almeida

et al. 2002

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…XPS has also proved to be a useful tool for investigating the structure of oxide glasses [3]. For example, XPS is able to differentiate between bridging oxygen (BO) and non-bridging oxygen atoms (NBO) in the glass structure for binary glasses [4][5][6] as well as more complex systems [7][8][9][10]. Satellite structures associated with the 2p core level peaks of transition metals which have been introduced into oxide glasses have been observed and used qualitatively to identify the oxidation state of the TM ion [11].…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of vanadium–sodium silicate glasses

Mekki

Khattak

Holland

et al. 2003

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

Vanadium-sodium silicate glasses with the chemical composition [ðV 2 O 5 Þ x (Na 2 O) 0:30 ðSiO 2 Þ 0:70Àx ] ð0:0 6 x 6 0:10Þ have been studied by X-ray photoelectron spectroscopy (XPS) and magnetization measurements. The core-level binding energies of O 1s, V 2p and Si 2p in these glasses have been measured for surfaces produced by in vacuo fracture. The peak position and width of the V 2p 3=2 peak are independent of the V 2 O 5 content while the O 1s core-level spectra show significant composition-dependent changes. Two distinct peaks are resolvable arising from the bridging oxygen and non-bridging oxygen (NBO) atoms in the silicate glasses. The fraction of NBO, determined from these spectra is found to increase with increasing V 2 O 5 content in the glass and are consistent with the formation of predominantly alkali metavanadate species. The magnetic susceptibility data of these glasses indicate a large, temperature-independent diamagnetic contribution arising from the glass matrix as well as small paramagnetic contribution from the V 4þ ions. The V 4þ content deduced from the magnetization results ($2%) is below the detection limit of XPS analysis.

show abstract

“…The identification of four-fold Ge ions as well as six-fold Ge ions has been corroborated by Raman scattering,8) X-ray diffraction,9),10) neu tron diffraction11) and X-ray emission spectro scopy.12) These measurements may conclude for Na2O-GeO2 glasses that the fraction of six-fold Ge ions increases with the addition of Na2O, shows a maximum of 20-25% at about 15-20mol% Na2O, and then decreases to zero around 35mol% Na2O. Some researchers also reported that non-bridging oxygen ions were produced above 15-20mol% Na2O.8),9), 13) Borate glasses also show anomalous dependences of properties on composition such as molar This formula indicates that refractive index is affect ed by two factors, that is, the packing and polariza tion of a glass. The number of the ion in a unit volume and the ionic refractivity for each component in a glass were determined to evaluate the packing and the polarization of a glass.…”

Section: Refractivementioning

confidence: 98%