Watching the Polymorphic Transition from a Field-Induced to a Stable Crystal by Dielectric Techniques

Daniel M. Duarte, Ranko Richert, Karolina Adrjanowicz

Research output: Contribution to journalArticlepeer-review

Abstract

We prepared a metastable polymorph of vinyl ethylene carbonate by inducing crystallization of the supercooled liquid via an electric field of about 80 kV cm-1. Electric fields with sufficiently low frequencies are required to observe polymorphism for this material. Depending on the temperature protocol prior to crystallization, the field-induced crystal structure can be obtained either with high polymorphic purity or mixed with seed crystals of the ordinary stable polymorph. At the crystallization temperature of Tc = 198 K, the pure field-induced polymorph shows no sign of a polymorphic transition, while at the same temperature, this crystal structure converts to the stable state in a matter of several hours if seeded by the stable polymorph. Interestingly, we find that the permittivity changes linearly with the volume fraction of the field-induced polymorph during the conversion, so that the polymorph transition can be followed in real time by dielectric techniques.

Original languageEnglish (US)
Pages (from-to)5406-5412
Number of pages7
JournalCrystal Growth and Design
Volume20
Issue number8
DOIs
StatePublished - Aug 5 2020
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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