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Preliminary Broadband Dielectric Spectroscopy Insight into Compressed Orientationally Disordered Crystal-Forming

Aleksandra Drozd-Rzoska1, Jakub Kalabiński1, Sylwester J Rzoska1

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Summary

This study reveals dielectric spectroscopy insights into neopentyl glycol (NPG) under high pressure, detailing its phase transitions and unique properties. Key findings include pressure-induced dielectric behavior and dynamics relevant to colossal barocaloric effects.

Keywords:
broadband dielectric spectroscopydielectric constantdiscontinuous phase transitionelectric conductivityglassy dynamicshigh-pressure barocaloric effectlow-frequency changesneopentyl glycolorientationally disordered crystalsplastic crystals

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Neopentyl glycol (NPG) exhibits unique properties under pressure.
  • Understanding orientationally disordered crystalline (ODIC) phases is crucial for materials science.
  • Phase transitions in molecular crystals are complex and require advanced characterization.

Purpose of the Study:

  • To investigate the dielectric properties of NPG under GPa-scale compression.
  • To elucidate the nature of the discontinuous phase transition between ODIC and solid crystalline states in NPG.
  • To explore the relationship between pressure, dielectric behavior, and barocaloric effects in NPG.

Main Methods:

  • Broadband dielectric spectroscopy was employed to study NPG under high pressure.
  • Measurements covered static, dynamic, and energy-related dielectric properties.
  • Analysis included DC electric conductivity and dissipation factor evolution.

Main Results:

  • Observed pressure-induced Mossotti catastrophe-type behavior of the dielectric constant.
  • Developed a novel approach to analyze non-Brønsted dynamics under compression.
  • Characterized changes in the dissipation factor, providing insights into NPG's fundamental behavior.
  • Presented new experimental evidence on ODIC mesophase and discontinuous phase transitions.

Conclusions:

  • The study provides critical insights into the behavior of NPG under extreme pressure conditions.
  • Findings contribute to a deeper understanding of ODIC mesophases and discontinuous phase transitions.
  • Results highlight the significance of NPG for colossal barocaloric effect applications.