Skip to main content
placeholder image

Mechanisms of Pressure-Induced Structural Transformation in Confined Sodium Borate Glasses

Journal Article


Abstract


  • © 2019 American Chemical Society. In this paper, density functional theory simulations were conducted to investigate the structural adaptation of sodium borates xNa2O·(100-x)B2O3 (x = 25, 33, 50, and 60 mol %) during the compression/decompression between 0 and 10 GPa. The sodium borates are confined between two Fe2O3 substrates and undergo the compression by reducing the gap between the two surfaces. The results reveal the borate response to the load through a two-stage transformation: rearrangement at low pressure and polymerization at high pressure. The pressure required to initiate the polymerization depends directly on the portion of fourfold-coordinated ([4]B) boron in the sodium borates. We found that the polymerization occurs through three different mechanisms to form BO4 tetrahedra with surface oxygen and nonbridging and bridging oxygen. The electronic structure was analyzed to understand the nature of these mechanisms. The conversions from BO3 to BO4 are mostly irreversible as a large number of newly formed BO4 remain unchanged under the decompression. In addition, the formation of a sodium-rich layer can be observed when the systems were compressed to high pressure. Our simulation provides insight into sodium borate glass responses to extreme condition and the underlying electronic mechanisms that can account for these behaviors.

Publication Date


  • 2019

Citation


  • Ta, T., Tieu, A., Zhu, H., Yu, H., Tran, N. & Ta, T. (2019). Mechanisms of Pressure-Induced Structural Transformation in Confined Sodium Borate Glasses. Journal of Physical Chemistry B,

Scopus Eid


  • 2-s2.0-85077067268

Place Of Publication


  • United States

Abstract


  • © 2019 American Chemical Society. In this paper, density functional theory simulations were conducted to investigate the structural adaptation of sodium borates xNa2O·(100-x)B2O3 (x = 25, 33, 50, and 60 mol %) during the compression/decompression between 0 and 10 GPa. The sodium borates are confined between two Fe2O3 substrates and undergo the compression by reducing the gap between the two surfaces. The results reveal the borate response to the load through a two-stage transformation: rearrangement at low pressure and polymerization at high pressure. The pressure required to initiate the polymerization depends directly on the portion of fourfold-coordinated ([4]B) boron in the sodium borates. We found that the polymerization occurs through three different mechanisms to form BO4 tetrahedra with surface oxygen and nonbridging and bridging oxygen. The electronic structure was analyzed to understand the nature of these mechanisms. The conversions from BO3 to BO4 are mostly irreversible as a large number of newly formed BO4 remain unchanged under the decompression. In addition, the formation of a sodium-rich layer can be observed when the systems were compressed to high pressure. Our simulation provides insight into sodium borate glass responses to extreme condition and the underlying electronic mechanisms that can account for these behaviors.

Publication Date


  • 2019

Citation


  • Ta, T., Tieu, A., Zhu, H., Yu, H., Tran, N. & Ta, T. (2019). Mechanisms of Pressure-Induced Structural Transformation in Confined Sodium Borate Glasses. Journal of Physical Chemistry B,

Scopus Eid


  • 2-s2.0-85077067268

Place Of Publication


  • United States