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Title: “True” negative thermal expansion in Mn-doped LaCu{sub 3}Fe{sub 4}O{sub 12} perovskite oxides

Negative and zero thermal expansion near room temperature have been achieved in a cubic A-site ordered perovskite oxide LaCu{sub 3}Fe{sub 4−x}Mn{sub x}O{sub 12}. A discontinuous volume change in the parent material LaCu{sub 3}Fe{sub 4}O{sub 12}, owing to a first-order intermetallic charge transfer transition (3Cu{sup 2+ }+ 4Fe{sup 3.75+} ⇄ 3Cu{sup 3+ }+ 4Fe{sup 3+}), is efficiently relaxed to a second-order-type negative thermal expansion with a linear thermal expansion coefficient (α{sub L}) of −2.2(1) × 10{sup −5 }K{sup −1} between 300 and 340 K at x = 0.75, followed by an almost zero thermal expansion [α{sub L} of −1.1(2) × 10{sup −6 }K{sup −1}] at x = 1 in a wide temperature range (240–360 K) including room temperature. Magnetic susceptibility measurements display substantial broadenings of the antiferromagnetic transition when x increases, supporting the relaxation of first-order electronic phase transition of the parent material. These findings indicate that the significant adjustability of thermal expansion properties can be achieved in first-order intermetallic charge-transfer transition.
Authors:
 [1] ;  [2] ;  [3] ; ;  [4]
  1. Nanoscience and Nanotechnology Research Center, Osaka Prefecture University, 1-2 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8570 (Japan)
  2. (Japan)
  3. Department of Chemistry, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531 (Japan)
  4. Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531 (Japan)
Publication Date:
OSTI Identifier:
22395463
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; COPPER COMPOUNDS; DOPED MATERIALS; FERRITES; IRON OXIDES; LANTHANUM COMPOUNDS; MAGNETIC SUSCEPTIBILITY; PEROVSKITE; PHASE TRANSFORMATIONS; RELAXATION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; THERMAL EXPANSION