Ultrasonic Velocity and Elastic Properties of Alkali Borate Glasses

Kodama, Masao; Kojima, Seiji; Feller, Steven A.; Affatigato, Mario

doi:10.1002/9781118144138.ch3

Cited by 3 publications

(7 citation statements)

References 10 publications

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“…For potassium, rubidium, and cesium borate glasses, the formation of BOØ 2 − units increases, while the formation of BØ 4 − units decreases in the order from potassium to cesium borate glasses, and ν is larger than that of lithium and sodium borate glasses. The alkali-earth dependence of ν in barium borate glasses is mild, while it has a similarity with that of potassium borate glasses [36]. The variation in structural units may be smaller than that of alkali borate glasses.…”

Section: Composition-dependence Of Poisson's Ratiomentioning

confidence: 86%

“…For As 2 O 3 , B 2 O 3 , and P 2 O 5 glasses, n B = 3 and ν ≈ 0.3, whereas for SiO 2 and GeO 2 glasses, n B = 4 and ν ≈ 0.2 [1]. Poisson's ratio of alkali and alkali-earth borate glasses determined using the ultrasonic pulseecho method is shown as a function of alkali and alkali-earth content in Figure 7 [35,36]. In undoped borate glass, ν = 0.28 is close to the case of n B = 3 and ν ≈ 0.3.…”

Section: Composition-dependence Of Poisson's Ratiomentioning

confidence: 99%

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Poisson’s Ratio of Glasses, Ceramics, and Crystals

Kojima

2024

Materials

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Poisson’s ratio is the fundamental metric used to discuss the performance of any material when strained elastically. However, the methods of the determination of Poisson’s ratio are not yet discussed well. The first purpose of this paper is to introduce the five kinds of typical experimental methods to measure Poisson’s ratio of glasses, ceramics, and crystals. The second purpose is to discuss the experimental results on the variation of Poisson’s ratio by composition, temperature, and pressure reviewed for various glasses, ceramics, and crystals, which are not yet reviewed. For example, in oxide glasses, the number of bridging oxygen atoms per glass-forming cation provides a straightforward estimation of network crosslinking using Poisson’s ratio. In the structural-phase transition of crystals, Poisson’s ratio shows remarkable temperature-dependence in the vicinity of a phase-transition temperature. The mechanism of these variations is discussed from physical and chemical points of view. The first-principles calculation of Poisson’s ratio in the newly hypothesized compounds is also described, and its pressure-induced ductile–brittle transition is discussed.

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Section: Composition-dependence Of Poisson's Ratiomentioning

confidence: 86%

Section: Composition-dependence Of Poisson's Ratiomentioning

confidence: 99%

Poisson’s Ratio of Glasses, Ceramics, and Crystals

Kojima

2024

Materials

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“…where is the density of the sample. The values of for potassium borate glass are taken from the data of Kodama et al 14) and Lim et al 15) Figure 3 shows the dependence of L on alkali metal composition. The triangles and circles denote the values for lithium borate and potassium borate glasses, respectively.…”

Section: Resultsmentioning

confidence: 99%

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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“…Fragility also increases markedly. 24,25) High-quality homogeneous glasses without strains and bubbles can be prepared by the solution reaction method. The composition dependences of longitudinal modulus are shown in Fig.…”

Section: Borate Anomalymentioning

confidence: 99%

“…available and are measured by the pulse-echo method. 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…”

Section: Borate Anomalymentioning

confidence: 99%

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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Ultrasonic Velocity and Elastic Properties of Alkali Borate Glasses

Cited by 3 publications

References 10 publications

Poisson’s Ratio of Glasses, Ceramics, and Crystals

Poisson’s Ratio of Glasses, Ceramics, and Crystals

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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