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This study links the ring size distribution in atomistic glass models to the experimentally measurable first sharp diffraction peak (FSDP) in iron phosphate glass (IPG). This research provides a physical interpretation for MRO and validates simulation models of complex glasses.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Medium-range order (MRO) in glasses, typically 7-15 Å, is linked to the first sharp diffraction peak (FSDP) in structure factor S(q).
  • The fundamental origin of the FSDP and its connection to MRO in complex glasses remain unclear.
  • Iron phosphate glass (IPG) is a technologically significant material with diverse applications, serving as a potential substitute for borosilicate glasses.

Purpose of the Study:

  • To investigate the fundamental origin of the FSDP in the structure factor S(q) for iron phosphate glass (IPG).
  • To establish a connection between atomistic structural features (ring distributions) and experimentally observable quantities (FSDP).
  • To validate atomistic models of complex glasses using experimentally measurable parameters.

Main Methods:

  • Generation of atomistic models for IPG using a hybrid approach combining Monte Carlo (MC) code and molecular dynamics (MD) simulations.
  • Validation of glass models through analysis of pair correlation functions, bond angle distributions, coordination numbers, and void size distributions.
  • Calculation of structure factors S(q) for individual ring sizes and estimation of their contributions using inverse fitting to correlate with experimental data.

Main Results:

  • The study successfully correlated ring size distributions in atomistic models with the FSDP in the structure factor S(q) for IPG.
  • Contributions of individual ring sizes to the total S(q) were found to correlate directly with ring size percentages in the models.
  • A melt-quenched model, initiated with an MC structure, effectively reproduced key experimental features of IPG.

Conclusions:

  • The research provides a physical interpretation for the ring distribution in atomistic glass models by linking it to the experimentally measurable FSDP.
  • Ring distribution serves as a valuable structural descriptor for validating medium-range order (MRO) in simulation-generated glass models.
  • This work advances the understanding of structure-property relationships in complex glasses like IPG.