The effect of borate and silicate structure on thermal conductivity in the molten Na2O–B2O3–SiO2 system

Kim, Young-Jae; Yanaba, Yutaka; Morita, Kazuki

doi:10.1016/j.jnoncrysol.2015.02.008

Cited by 29 publications

(19 citation statements)

References 41 publications

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“…Owing to the modification of the transient hot‐wire method, the thermal conductivity has been successfully measured in various molten oxide systems at high temperature . Several studies have revealed that the thermal conductivity of the molten oxide system is closely related to the network structure.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Conductivity of Molten Li₂O–B₂O₃ and K₂O–B₂O₃ Systems

Kim

Morita

2015

J. Am. Ceram. Soc.

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Using the transient hot-wire method, the thermal conductivity properties of the molten Li 2 O-B 2 O 3 and K 2 O-B 2 O 3 systems were measured. The thermal conductivity increases with decreasing the temperature due to the borate structure change. In addition, calculations of the one-dimensional Debye temperature and the phonon mean free paths as a function of temperature of the alkali borate systems were made. At a fixed temperature of 1273 K, the effect of the alkali oxide concentration on the thermal conductivity was evaluated. Within a range of 10-30 mol% Li 2 O (or K 2 O), a positive relationship between the thermal conductivity and 4-coordinate boron was obtained. However, below 10 mol% Li 2 O (or K 2 O), the change in the intermediate-range order of the borate structure had a more dominant effect on the thermal conductivity. Finally, the effect of cations on the thermal conductivity in the various molten R 2 O-B 2 O 3 (R=Li, Na and K) systems was considered. Depending on the type of cation, the change in the ionization potential had an effect on the thermal conductivity and also resulted in a change in the bond strength.

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Section: Introductionmentioning

confidence: 99%

“…In the B 2 O 3 bearing molten oxide system, the relationship between the thermal conductivity and the relative fraction of 4‐coordinate boron has been studied . However, the effect of cations on the thermal conductivity in the molten borate system has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Molten Li₂O–B₂O₃ and K₂O–B₂O₃ Systems

Kim

Morita

2015

J. Am. Ceram. Soc.

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“…25 Frenkel 28 pointed out that during times shorter than the average time s M between consecutive atomic jumps, a liquid can be considered as a solid because its structure remains in a static state. [17][18][19][20][21]29,30 An increase in the temperature of a molten oxide is closely related to the increasing of atomic vibration by thermal activation. 26,27 Figure 1 shows the relation between thermal conductivity and temperature in the molten CaO-B 2 O 3 system.…”

Section: Effect Of Temperature On Thermal Conductivitymentioning

confidence: 99%

Influence of structure and temperature on the thermal conductivity of molten CaO–B₂O₃

2017

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The effect of the temperature and borate structure on the thermal conductivity of the molten CaO–B2O3 binary system was investigated. The thermal conductivity was measured from 1573 K to approximately the liquidus temperature using a transient hot‐wire method, and was found to decrease with increasing temperature. The temperature dependence of the thermal conductivity in the molten oxide system was interpreted in terms of the lifetime of phonon‐like excitations and Maxwell relaxation times. The short‐range order borate structure was investigated through magic angle spinning (MAS) and triple‐quantum MAS (3Q‐MAS) NMR. Although the content of 4‐coordinated boron was not significantly affected by the addition of CaO, structural changes associated with the fraction of 3‐coordinated boron in ring and non‐ring sites were observed. The Raman spectra showed that the intermediate range order borate structure was changed from boroxyl rings to chain‐type metaborate units at higher CaO concentrations. The thermal conductivity decreased with decreasing BO1.5/CaO ratio, owing to the depolymerization of the borate network.

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“…3. Previous studies revealed that Na 2 O could decrease the T g , T x and T p [40,41,45]. Adding Na + into borate glass will increase the nonbridging oxygen, which leads to the increase of the triangular [BO 3 ] and decrease of the tetrahedral [BO 4 ] -.…”

Section: Measurements and Fracture Model Analysismentioning

confidence: 99%

“…In this study, with the addition of Na 2 O, the CTE of bonding agent has a increasing trend (Table 1). Na + will increase the nonbridging oxygen, which decreases the tetrahedral [BO 4 ] - [40,41]. That's the reason why Na 2 O can increase the CTE.…”

Section: Effect Of Cte On Ti6al4v-porcelain Bond Strengthmentioning

confidence: 99%

Evaluation to the effect of B2O3–La2O3–SrO–Na2O–Al2O3 bonding agent on Ti6Al4V–porcelain bonding

Zhao

et al. 2016

Journal of the Mechanical Behavior of Biomedical Materials

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The effect of borate and silicate structure on thermal conductivity in the molten Na2O–B2O3–SiO2 system

Cited by 29 publications

References 41 publications

Thermal Conductivity of Molten Li₂O–B₂O₃ and K₂O–B₂O₃ Systems

Thermal Conductivity of Molten Li₂O–B₂O₃ and K₂O–B₂O₃ Systems

Influence of structure and temperature on the thermal conductivity of molten CaO–B₂O₃

Evaluation to the effect of B2O3–La2O3–SrO–Na2O–Al2O3 bonding agent on Ti6Al4V–porcelain bonding

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The effect of borate and silicate structure on thermal conductivity in the molten Na2O–B2O3–SiO2 system

Cited by 29 publications

References 41 publications

Thermal Conductivity of Molten Li2O–B2O3 and K2O–B2O3 Systems

Thermal Conductivity of Molten Li2O–B2O3 and K2O–B2O3 Systems

Influence of structure and temperature on the thermal conductivity of molten CaO–B2O3

Evaluation to the effect of B2O3–La2O3–SrO–Na2O–Al2O3 bonding agent on Ti6Al4V–porcelain bonding

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Thermal Conductivity of Molten Li₂O–B₂O₃ and K₂O–B₂O₃ Systems

Thermal Conductivity of Molten Li₂O–B₂O₃ and K₂O–B₂O₃ Systems

Influence of structure and temperature on the thermal conductivity of molten CaO–B₂O₃