Glass Transitions and Elastic Properties of Lithium Borate Glasses over a Wide Composition Range Studied by Micro-Brillouin Scattering

Fukawa, Yasuteru; Matsuda, Yu; Ike, Yuji; Kodama, Masao; Kojima, Seiji

doi:10.1143/jjap.47.3833

Cited by 13 publications

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References 14 publications

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“…Even in the case of the lithium borate binary glasses, physical properties do not monotonically change with the increase of the alkali metal oxide content, but exhibit maxima or minima against their composition, for density [5], sound velocity [6,7], non-Debye parameters [8][9][10] and boson peak [11]. Therefore, at the present stage, it is difficult to predict the physical properties of the ternary or more borate glasses containing lithium ion.…”

Section: Introductionmentioning

confidence: 99%

Dynamic glass transition and fragility of lithium borate binary glass

et al. 2008

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The compositional variations of the fragility of lithium borate binary glasses have been investigated over a wide composition range up to 64 mol% of Li 2 O. The frequency dependences of the dynamic heat capacity C p (ω) above the dynamic glass transition temperature T g have been observed by Temperature-Modulated DSC. The fragility or steepness index m has been determined. The composition dependence has been discussed on the basis of the fragility model proposed by Vilgis, and it has been revealed that the trends of the fragility and the fluctuation of the coordination number of boron atom have the correlation over a wide composition range. The result indicates the origin of the fragility relates to the degree of the fluctuation of the coordination number. The formation of the 4-coordinated boron atom plays the dominant role in the fragility of the borate glassy system.

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Section: Introductionmentioning

confidence: 99%

Dynamic glass transition and fragility of lithium borate binary glass

et al. 2008

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“…The usefulness of Brillouin spectroscopy to explore elastic properties using a finely focused laser beam without any contact with a sample has been shown in our previous papers. [6][7][8] The elastic properties of compositions with a value of x up to 42 were successfully observed, and x ¼ 42, which may be the upper limit for K 2 O composition for glassforming compositions obtainable by conventional plate quenching. The dependences of both elastic constant and absorption coefficient on K 2 O composition have been investigated over a wide composition range of 2 x 42 mol %.…”

Section: Introductionmentioning

confidence: 85%

Elastic Properties of Potassium Borate Glass in a Wide Composition Range Studied by Brillouin Scattering

Kawashima

Matsuda

Fukawa

et al. 2009

Jpn. J. Appl. Phys.

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The elastic properties of potassium borate glass, x K 2 O . (100 À x )B 2 O 3 , where x is the molar composition of K 2 O in mol %, have been investigated by Brillouin scattering spectroscopy over a wide composition range of 2 x 42 mol %. From the observed values of longitudinal sound velocity, the elastic constant has been determined and compared with that of lithium borate glass. The sound velocity increases with increasing x below x ¼ 30; however, for a further increase in x , it decreases owing to the softening caused by the formation and increase in the number of nonbridging oxygen atoms. The absorption coefficient also increases markedly above x ¼ 30 owing to the scattering of acoustic waves by nonbridging oxygen atoms. The temperature dependences of both sound velocity and absorption coefficient of 14K 2 O . 86B 2 O 3 show a markedly change at approximately the glass transition temperature T g of 395 C.

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“…6 24,25) While for glasses of compositions higher than these upper limits, the tendency to crystallize increases and only thin plates are available by the rapid-quenching method and can be measured only by MBBS. 26,27) In both glasses the maxima are observed about 40% or xLi 2 O . (…”

Section: Borate Anomalymentioning

confidence: 94%

Gigahertz Acoustic Spectroscopy by Micro-Brillouin Scattering

Kojima

2010

Jpn. J. Appl. Phys.

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An interesting problem on condensed matter in pure and applied sciences is the understanding of vibration and relaxation dynamics in the gigahertz range, especially cooperative motions in nonequilibrium states. In this work, we review the progress in micro-Brillouin scattering spectroscopy (MBSS) for condensed matter. MBSS has been achieved by combining a tandem multipass Fabry-Perot interferometer and an optical microscope to probe the gigahertz dynamics in a microscopic area/sample. It provides the fundamental information on a variety of vibration and relaxation processes and elementary excitations related to the lattice instability of structural phase transitions of normal and relaxor ferroelectrics, nonequilibrium cooperative dynamics of liquid-glass transitions and the hydration dynamics of protein glass transitions. The most relevant studies on the various aspects of gigahertz dynamics are provided. #

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Glass Transitions and Elastic Properties of Lithium Borate Glasses over a Wide Composition Range Studied by Micro-Brillouin Scattering

Cited by 13 publications

References 14 publications

Dynamic glass transition and fragility of lithium borate binary glass

Dynamic glass transition and fragility of lithium borate binary glass

Elastic Properties of Potassium Borate Glass in a Wide Composition Range Studied by Brillouin Scattering

Gigahertz Acoustic Spectroscopy by Micro-Brillouin Scattering

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