Thermal conductivity of Na2O–B2O3–SiO2 melts

Tsuyoshi Nishi, Takumi Manako, Katsuya Ohnuma, Hiromichi Ohta, Sohei Sukenaga, Hiroyuki Shibata, Toshiro Oniki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Borosilicate glasses are candidate materials for the immobilization of high-level radioactive waste. The values of thermal conductivity of different borosilicate melts are thus indispensable information when optimizing the temperature distribution in a glass melting furnace. In this study, the thermal effusivity of Na2O–B2O3–SiO2 melts was measured using a front heating–front detection laser-flash method. The thermal conductivity, which can be obtained by combining the measured thermal effusivity with the specific heat capacity and density, was calculated using the least-squares method; the values for the Na2O–B2O3–SiO2 melts either slightly decreased linearly with increasing temperature or remained almost constant over the investigated temperature range. The values of thermal conductivity of the Na2O–B2O3–SiO2 melts were higher than those of B2O3–SiO2 melts and lower than those of CaO–B2O3–SiO2 melts. Furthermore, the thermal conductivity of the Na2O–B2O3–SiO2 melts was compared with those of the B2O3–SiO2 and CaO–B2O3–SiO2 samples.

Original languageEnglish
Pages (from-to)710-715
Number of pages6
Journaljournal of nuclear science and technology
Issue number8
Publication statusPublished - 2019 Aug 3


  • NaO–BO–SiO melt
  • Thermal effusivity
  • front-heating–front-detection laser-flash (FH–FDLF) method
  • network model
  • thermal conductivity

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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