Bibliographic Details
| Title: |
Modeling structure–properties relations in compositionally disordered relaxor dielectrics at the nanoscale. |
| Authors: |
Gurung, Ashok1 (AUTHOR) ashok.gurung@uconn.edu, Mangeri, John2,3 (AUTHOR), Hagerstrom, Aaron M.4 (AUTHOR), Orloff, Nathan D.4 (AUTHOR), Alpay, S. Pamir1,3 (AUTHOR), Nakhmanson, Serge1,3 (AUTHOR) serge.nakhmanson@uconn.edu |
| Source: |
Journal of Applied Physics. 9/14/2023, Vol. 134 Issue 10, p1-14. 14p. |
| Subject Terms: |
*DIELECTRICS, *THERMODYNAMIC potentials, *SOLID solutions |
| Abstract: |
The solid solution Ba 1 − x Sr x TiO 3 (BSTO) displays dielectric response that is highly tunable, while also exhibiting low losses in a broad frequency regime, including the microwave band. Therefore, there is a need for a better understanding of the influence of the BSTO microstructure on its relaxor properties and performance in a variety of technological applications. Since the local polarization in BSTO is strongly dependent on composition, so is its response to an applied AC field. In this work, we have adopted a phase field method to study the frequency-dependent dielectric response of this system while accounting for the local fluctuations in the solid-solution composition. By utilizing a thermodynamic potential that includes spatial dependence on the averaged Sr content, we connected relaxor-like features in the dielectric dispersion to local spatial inhomogeneities, such as average size of Sr- or Ba-rich regions, across a wide range of temperatures. These results show that the adopted simple coarse-grained approach to the relaxor problem is sensitive enough to reveal correlations between the frequency and temperature dependence of the dielectric response and modulations in the material morphology and microstructure. [ABSTRACT FROM AUTHOR] |
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| Database: |
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