Quasi-amorphous materials

David Ehre, Ellen Wachtel, Igor Lubomirsky

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


Quasi-amorphous films are the only known inorganic, non-crystalline, polar materials. The conditions under which they are formed and the origin of their polarity set these materials apart from other classes of inorganic materials. The unique feature of the quasi-amorphous phase is that its polarity is the result of flexoelectric-induced orientational ordering of local bonding units without any detectable spatial periodicity. However, unlike classical flexoelectricity - the reversible coupling of polarity and strain gradients - the strain gradient imposed on quasiamorphous films leads to permanent polarization, i.e. the polarization is retained even after the strain gradient has been eliminated. This mechanism permits compounds that do not have polar crystalline polymorphs, such as SrTiO3 and BaZrO3, to form polar, non-crystalline solids. In this chapter, we describe the essential features of quasiamorphous materials including preparation, structure, and chemical composition.

Original languageEnglish
Title of host publicationFlexoelectricity In Solids
Subtitle of host publicationFrom Theory To Applications
PublisherWorld Scientific Publishing Co.
Number of pages24
ISBN (Electronic)9789814719339
ISBN (Print)9789814719315
StatePublished - 11 Aug 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 by World Scientific Publishing Co. Pte. Ltd. All rights reserved.


Dive into the research topics of 'Quasi-amorphous materials'. Together they form a unique fingerprint.

Cite this