Structure and Raman spectra of glasses containing several glass-forming oxides and no glass-modifying oxide

Chen, Haiyan; Huang, Guosong; Hanfen, Mao; Gan, Fuxi

doi:10.1016/0022-3093(86)90389-3

Cited by 13 publications

(2 citation statements)

References 6 publications

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“…Raman spectroscopy confirms the infrared results, indicating a mainly metaphosphate chain structure at low B 2 O 3 content and the increase in network strength as the B 2 O 3 content increases. However, unlike infrared spectroscopy, Raman gives direct evidence of P-O-B links as the band at around 630 cm À1 , observed in all samples and increasing with B 2 O 3 content, is exclusively due to the vibrations of metaborate units bonded to P-O [29][30][31]. In particular, in the sample P40B30Na30, ring type metaborate units bonded to non-bridging P-O are likely to contribute to this band [9].…”

Section: Discussionmentioning

confidence: 82%

The effect of composition on the structure of sodium borophosphate glasses

Carta

Qiu

Guerry

et al. 2008

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 82%

The effect of composition on the structure of sodium borophosphate glasses

Carta

Qiu

Guerry

et al. 2008

Journal of Non-Crystalline Solids

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“…For example, alkali or alkaline earth elements can be added during the glass preparation. It is then possible to manufacture binary glasses [ 34 , 38 , 39 ], ternary glasses [ 40 , 41 ] or more complex glasses [ 42 ]. The structure of these glasses then contains non-bridging oxygen atoms, which do not connect two SiO

tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Pressure Dependence of Raman Mode for an Alumina–Glass Pair in Hertzian Contact

et al. 2022

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Optimising the performance of materials requires, among other things, the characterisation of residual stresses during the design stage. Raman spectroscopy offers access to these residual stresses at the micrometre scale when this inelastic light scattering is active in these materials. In this case, the relationship between the Raman mode shift and the pressure must be known. High-pressure cells with diamond anvils or bending instruments coupled to Raman spectrometers are habitually used to determine this relationship. In this article, we propose a new method that involves a Hertzian contact to obtain this relationship. A device that compresses an alumina ball against a transparent glass plane is connected to a Raman spectrometer. Under these conditions, the contact pressure can be as high as 1.5 GPa. The contact between the glass plane and the ball is observed through a diaphragm. Several hundred Raman spectra are recorded depending on the contact diameter. The spectral profiles obtained represent the shift in the Raman modes of alumina and glass along the contact diameter. Hertz’s theory accurately describes the pressure profile as a function of position for elastic materials. Therefore, the contact diameter can be measured by fitting the spectral profile with a function identical to the Hertz profile. We then deduce the maximum pressure. Next, the calculated pressure profile along the contact diameter is correlated with the spectral profile. We obtain a pressure dependence of the Raman mode with a coefficient equal to 2.07 cm−1/GPa for the Eg modes of alumina at 417 cm−1, which is in good agreement with the literature. In the case of glass, we refine the measurement of the Q3 mode shift at 1096 cm−1 in the studied pressure range compared to the literature. We find a coefficient of 4.31 cm−1/GPa. This work on static contacts opens up promising prospects for investigations into dynamic contacts in tribology.

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