2003/04/08 by Morrel H. Cohen, Jeffrey B. Neaton, J. B. Neaton +2 · 3 citations
Materials Science · Physics and Astronomy · #Dielectric properties of ceramics #Ferroelectric and Piezoelectric Materials #Multiferroics and related materials #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.1595708
9 pages, with 1 postscript figure embedded. Uses REVTEX and epsf macros. Also available at http://www.physics.rutgers.edu/~dhv/preprints/mc_ext/index.html
arxiv created 2003/04/08 · openalex publication_date 2003/08/21 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The large, temperature-independent, low-frequency dielectric constant recently observed in single-crystal CaCu3Ti4O12 is most plausibly interpreted as arising from spatial inhomogenities of its local dielectric response. Probable sources of inhomogeneity are the various domain boundaries endemic in such materials: twin, Ca ordering, and antiphase boundaries. The material in, and neighboring, such boundaries can be insulating or conducting. We construct a decision tree for the resulting six possible morphologies, and derive or present expressions for the dielectric constant for models of each morphology. We conclude that all six morphologies can yield dielectric behavior consistent with observations. Thus, present experimental findings are insufficient to establish the internal morphology responsible for the remarkable properties of CaCu3Ti4O12, and we suggest further experiments to distinguish among them.