Abstract
While the lattice volume in the solid-solution Ba1−xCaxTiO3 decreases with increasing x, the Curie temperature remains unaffected, in contrast to Ba1−xSrxTiO3. We have determined the origin of this phenomenon by comparing the local structures in (Ba,Ca)TiO3 and (Ba,Sr)TiO3. Reverse Monte Carlo refinements of instantaneous atomic positions using simultaneous fitting of multiple types of experimental data (neutron total scattering, X-ray absorption fine structure, patterns of diffuse scattering in electron diffraction) reveal both ferroelectric Ca displacements and their amplification of the Ti off-centering, which mitigate the lattice-volume effects. The activity of Ca is triggered by the anomalously strained Ca-O bonds.
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Dates
Type | When |
---|---|
Created | 12 years, 3 months ago (April 26, 2013, 9:41 a.m.) |
Deposited | 2 years, 1 month ago (July 1, 2023, 8:26 p.m.) |
Indexed | 1 day, 4 hours ago (Aug. 23, 2025, 9:45 p.m.) |
Issued | 12 years, 4 months ago (April 22, 2013) |
Published | 12 years, 4 months ago (April 22, 2013) |
Published Online | 12 years, 4 months ago (April 25, 2013) |
Published Print | 12 years, 4 months ago (April 22, 2013) |
Funders
1
U.S. Department of Energy
10.13039/100000015
Region: Americas
gov (National government)
Labels
8
- Energy Department
- Department of Energy
- United States Department of Energy
- ENERGY.GOV
- US Department of Energy
- USDOE
- DOE
- USADOE
Awards
2
- DE-AC02-98CH10886
- DE-AC52-06NA25396
@article{Levin_2013, title={Local-structure origins of the sustained Curie temperature in (Ba,Ca)TiO3 ferroelectrics}, volume={102}, ISSN={1077-3118}, url={http://dx.doi.org/10.1063/1.4802996}, DOI={10.1063/1.4802996}, number={16}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Levin, Igor and Krayzman, Victor and Woicik, Joseph C.}, year={2013}, month=apr }