The dielectric behaviour of Mg-Al-Si, Ca-Al-Si, Y-Al-Si and Nd-Al-Si oxynitride glasses

Kenmuir, S. V. J.; Thorp, J. S.; Kulesza, B.L.J.

doi:10.1007/bf00542068

Cited by 17 publications

(5 citation statements)

References 13 publications

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“…Moreover, silver can evaporate even at low (573-623 K) temperature [21] and silver ions are mobile in many materials, therefore, it should be used only for measurements at a low-temperature range [22,23]. The second often-used metal is gold, which has been applied for high-temperature measurements [24][25][26][27], even up to a temperature of 873 K [15]. However, the application of gold electrodes also has its limitations, which are often ignored.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Thin Gold Electrodes on the High-Temperature Impedance of Oxide Glasses

Wójcik

Barczyński

2022

Coatings

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The influence of thin gold electrodes on the electrical measurements of glasses at high temperatures was studied using impedance spectroscopy. The impedance was measured several times over a wide frequency range from 10 mHz to 1 MHz and the temperature ranged from 213 to 673 K under air and nitrogen atmospheres. The results showed a drop in the conductivity of more than an order of magnitude at a temperature around 603 K during heating. An additional relaxation process was found at the low-frequency region. The occurred process was correlated with the thermal disintegration of the gold nano-layer used as an improvement in the electrical contact. The possible ambiguous interpretation of high-temperature impedance spectra was presented as a consequence of performing the electrical measurements only during heating or cooling while using unstable thin gold electrodes. Moreover, a possible solution to this problem was proposed.

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Section: Introductionmentioning

confidence: 99%

The Influence of Thin Gold Electrodes on the High-Temperature Impedance of Oxide Glasses

Wójcik

Barczyński

2022

Coatings

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“…Oxynitride glass formation may take place in a number of M–Si–O–N systems (with M = Na, Li, Mg, Ca, Sr, La, Pr, Ce, Y, Al), M –Si–Al–O–N systems (where M includes Li, Mg, Ca, Ba, RE, Y), and M I –M II – Si – (Al) – O–N systems (where M I – M II modifiers: Na–Ca–Si–O–N, RE–Mg–Si–O–N, La–Y–Si–O–N, RE–Si–Al–O–N, Mg–Li–Si–Al–O–N, Mg–Cs–Si–Al–O–N, Mg–Ba–Si–Al–O–N, La–Er–Si–Al–O–N, Mg–Y–Si–Al–O–N). Oxynitride glasses have traditionally been synthesized by melting mixtures of glass modifier metal oxides, SiO 2 , and Si 3 N 4 , yielding glasses with nitrogen contents up to typically ~30 e/o (N content in e/o = 3[N]/(3[N] + 2[O]), with [N] and [O] expressed as the atomic concentrations of N and O, respectively).…”

Section: Introductionmentioning

confidence: 99%

Glasses in theBa–Si–O–NSystem

Ali

Jonson

2011

Journal of the American Ceramic Society

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The preparation and properties of Ba-Si-O-N glasses are reported. These oxynitride glasses were prepared by melting mixtures of BaH 2 , SiO 2 , and Si 3 N 4 powders in a nitrogen atmosphere at 1550°-1700°C. The glasses were characterized by X-ray powder diffraction, differential thermal analysis, and scanning electron microscopy. Final glass compositions were calculated from analyses obtained by energy dispersive X-ray (EDX) spectroscopy and combustion analysis, for cation and anion compositions, respectively. The glasses were found to be homogenous, translucent gray to opaque black, and consists of N contents of up to 42 equiv% and Ba contents of up to 36 equiv%. Determined glass densities varied between 3.27 and 4.18 g/cm 3 , and calculated molar volumes varied between 10.28 and 11.11 cm 3 /mol. Both density and molar volume increase with Ba content. Glass compactness (0.45-0.49), glass transition temperature (786°-905°C), and microhardness (7.93-9.56 GPa) were found to increase linearly with N content. The refractive index increased from 1.66 to 1.91 and was found to be strongly correlated with the amounts of Ba and N.

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“…Typically the dielectric constant is analyzed in terms of the polarizability of the ions or structural units. For example, Kenmuir et al 8 have studied Mg-Al-Si oxynitride glasses and found that the addition of nitrogen increases the dielectric constant. Singer and Tomozawa 5 have found for cordierite-based oxyfluoride glasses that fluorine substitution results in a lower dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

Correlation between dielectric constant and chemical structure of sodium silicate glasses

Hsieh

Jain

Kamitsos

1996

Journal of Applied Physics

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The chemical structure of sodium aluminosilicate glasses is determined by high resolution x-ray photoelectron spectroscopy ͑XPS͒ as silicon is gradually replaced by aluminum. A well-defined chemical state is found for silicon, aluminum, and sodium atoms, while three different environments are identified for oxygen atoms corresponding to Si-O-Si, Si-O-Al, and Si-O-Na bonds. The binding energy of Na 1s photoelectrons increases significantly with increasing aluminum substitution while that of Al 2p and components of O 1s photoelectrons remains approximately constant. Thus, the ionicity of sodium increases with aluminum amount, but the over all electron density around silicon, aluminum, and different types of oxygen atoms remains unchanged. The dielectric constant of the glasses increases with increasing aluminum substitution. It is analyzed in terms of the polarizabilities of constituent structural units, viz., silicon tetrahedra, nonbridging oxygen-sodium ion pairs, and aluminum tetrahedron-sodium ion pairs. The electronic polarizability of oxygen ions depends linearly on their negative charge and can be correlated to the O 1s XPS binding energy. The ionic polarizability of sodium ions increases with an increasing aluminum amount, and correlates directly with the Na 1s XPS binding energy.

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The dielectric behaviour of Mg-Al-Si, Ca-Al-Si, Y-Al-Si and Nd-Al-Si oxynitride glasses

Cited by 17 publications

References 13 publications

The Influence of Thin Gold Electrodes on the High-Temperature Impedance of Oxide Glasses

The Influence of Thin Gold Electrodes on the High-Temperature Impedance of Oxide Glasses

Glasses in theBa–Si–O–NSystem

Correlation between dielectric constant and chemical structure of sodium silicate glasses

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