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- W2074885817 abstract "Negative and zero thermal expansion near room temperature have been achieved in a cubic A-site ordered perovskite oxide LaCu3Fe4−xMnxO12. A discontinuous volume change in the parent material LaCu3Fe4O12, owing to a first-order intermetallic charge transfer transition (3Cu2+ + 4Fe3.75+ ⇄ 3Cu3+ + 4Fe3+), is efficiently relaxed to a second-order-type negative thermal expansion with a linear thermal expansion coefficient (αL) of −2.2(1) × 10−5 K−1 between 300 and 340 K at x = 0.75, followed by an almost zero thermal expansion [αL of −1.1(2) × 10−6 K−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." @default.
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- W2074885817 date "2014-12-08" @default.
- W2074885817 modified "2023-10-08" @default.
- W2074885817 title "“True” negative thermal expansion in Mn-doped LaCu3Fe4O12 perovskite oxides" @default.
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- W2074885817 doi "https://doi.org/10.1063/1.4903890" @default.
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