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Title: Metallic-like to nonmetallic transitions in a variety of heavily oxygen deficient ferroelectrics

The coupling between ferroelectric distortions and electron transport is an important factor in understanding ferroelectric/noncentrosymmetric materials with metallic conductivities and ferroelectric-based thermoelectrics. Here, multiple d{sup 0} ferroelectrics with a variety of crystal structures are doped via oxygen deficiency, resulting in metallic-like conduction in the paraelectric state. It is found that most of the studied systems show a metallic-like to nonmetallic transition near the paraelectric-ferroelectric transition. The metallic-like to nonmetallic transition temperature can be shifted using mechanisms that shift the paraelectric-ferroelectric transition temperature. It was found that the metallic-like to nonmetallic transition temperature could be shifted from 373 K to 273 K by varying (Ba{sub 1−x}Sr{sub x})TiO{sub 3−δ} from x = 0 to x = 0.3 and x = 1. The most probable mechanism for ferroelectric-electron transport coupling was determined to be Anderson localization associated with polarization with short-range order.
Authors:
; ;  [1] ;  [2]
  1. Center for Dielectrics and Piezoelectrics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  2. Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju, Gyeongnam 52851 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22489205
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTAL STRUCTURE; DOPED MATERIALS; FERROELECTRIC MATERIALS; OXYGEN; POLARIZATION; TEMPERATURE RANGE 0273-0400 K; TITANATES; TITANIUM OXIDES; TRANSITION TEMPERATURE