Dielectric Response in Microscopically Heterogeneous Dielectrics: Example of KTaO_3:Nb
S. Prosandeev, V. Trepakov, S. Kapphan, M. Savinov
TL;DR
This paper investigates the dielectric response of microscopically heterogeneous KTaO_3:Nb solid solutions using a quantum theory of ferroelectric transitions, employing percolation and random field models.
Contribution
It introduces a combined percolation and random field theoretical framework to describe local heterogeneities in quantum paraelectric materials.
Findings
Experimental data supports the heterogeneity model.
Percolation theory explains dielectric behavior.
Random fields influence phase transition characteristics.
Abstract
New experimental data on solid solutions of quantum paraelectrics with KTaO_3:Nb as an example are considered within a framework of a quantum theory of ferroelectric phase transitions. In order to describe the effect of local heterogeneities a percolation type theory together with a random field approach were employed.
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