Thermotropic phase boundaries in classic ferroelectrics.

Abstract:

:High-performance piezoelectrics are lead-based solid solutions that exhibit a so-called morphotropic phase boundary, which separates two competing phases as a function of chemical composition; as a consequence, an intermediate low-symmetry phase with a strong piezoelectric effect arises. In search for environmentally sustainable lead-free alternatives that exhibit analogous characteristics, we use a network of competing domains to create similar conditions across thermal inter-ferroelectric transitions in simple, lead-free ferroelectrics such as BaTiO3 and KNbO3. Here we report the experimental observation of thermotropic phase boundaries in these classic ferroelectrics, through direct imaging of low-symmetry intermediate phases that exhibit large enhancements in the existing nonlinear optical and piezoelectric property coefficients. Furthermore, the symmetry lowering in these phases allows for new property coefficients that exceed all the existing coefficients in both parent phases. Discovering the thermotropic nature of thermal phase transitions in simple ferroelectrics thus presents unique opportunities for the design of 'green' high-performance materials.

journal_name

Nat Commun

journal_title

Nature communications

authors

Lummen TT,Gu Y,Wang J,Lei S,Xue F,Kumar A,Barnes AT,Barnes E,Denev S,Belianinov A,Holt M,Morozovska AN,Kalinin SV,Chen LQ,Gopalan V

doi

10.1038/ncomms4172

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

3172

issn

2041-1723

pii

ncomms4172

journal_volume

5

pub_type

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