The relation of local order to material properties in relaxor ferroelectrics
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northern Illinois Univ., DeKalb, IL (United States). Department of Physics
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). NIST Center for Neutron Research
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
- Cornell Univ., Ithaca, NY (United States). CHESS
- Simon Fraser University, Burnaby, British Columbia (Canada). Department of Chemistry and 4D LABS
- Argonne National Lab. (ANL), Argonne, IL (United States). Mathematics and Computer Science Division; Univ. of Chicago, IL (United States). Computation Institute
- Chinese Academy of Sciences, Shanghai (China). Shanghai Institute of Ceramics
Correlating electromechanical and dielectric properties with nanometre-scale order is the defining challenge for the development of piezoelectric oxides. Current lead (Pb)-based relaxor ferroelectrics can serve as model systems with which to unravel these correlations, but the nature of the local order and its relation to material properties remains controversial. Here we employ recent advances in diffuse scattering instrumentation to investigate crystals that span the phase diagram of PbMg1/3Nb2/3O3-xPbTiO(3) (PMN-xPT) and identify four forms of local order. From the compositional dependence, we resolve the coupling of each form to the dielectric and electromechanical properties observed. We show that relaxor behaviour does not correlate simply with ferroic diffuse scattering; instead, it results from a competition between local antiferroelectric correlations, seeded by chemical short-range order, and local ferroic order. The ferroic diffuse scattering is strongest where piezoelectricity is maximal and displays previously unrecognized modulations caused by anion displacements. Our observations provide new guidelines for evaluating displacive models and hence the piezoelectric properties of environmentally friendly next-generation materials.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); Natural Sciences and Engineering Research Council of Canada (NSERC)
- Grant/Contract Number:
- AC05-00OR22725; AC02-06CH11357
- OSTI ID:
- 1474571
- Alternate ID(s):
- OSTI ID: 1465134
- Journal Information:
- Nature Materials, Vol. 17, Issue 8; ISSN 1476-1122
- Publisher:
- Springer Nature - Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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