Superelastic Softening of Ferroelastic Multidomain Crystals

Many proper and improper ferroelastic materials display (at sufficiently low measurement frequencies) a huge elastic softening below T c . This giant elastic softening, which can be suppressed with uniaxial stress, is caused by domain wall motion. Here we shortly review our results on frequency and...

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Bibliographic Details
Published inFerroelectrics Vol. 426; no. 1; pp. 242 - 250
Main Authors Schranz, W., Kabelka, H., Tröster, A.
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis Group 01.01.2012
Taylor & Francis Ltd
Subjects
Crystals
Domain walls
domains
Ferroelastic materials
ferroelasticity
Ferroelectric materials
Ferroelectrics
Landau theory
Materials science
Mathematical models
Minerals
Perovskites
phase transformations
Phase transitions
Softening
Superelastic softening
Superelasticity
Temperature
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Summary:Many proper and improper ferroelastic materials display (at sufficiently low measurement frequencies) a huge elastic softening below T c . This giant elastic softening, which can be suppressed with uniaxial stress, is caused by domain wall motion. Here we shortly review our results on frequency and temperature dependent elastic measurements of perovskites which exhibit improper ferroelastic phase transitions. We also present a new model - based on Landau-Ginzburg theory including long range interaction of needle shaped ferroelastic domains - which describes superelastic softening observed in many of the perovskite systems very well. We also show how the theory can be extended to proper ferroelastic materials and apply it to describe the elastic behaviour of the proper ferroelastic material La 1-x Nd x P 5 O 14 (LNPP).
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2012.671754