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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

New forms of phase segregation

Article Abstract:

Some manganese-oxide perovskites were found to show intrinsic 'colossal' magnetoresistance (CMR). CMR refers to a dramatic decrease in resistivity with applied magnetic field. Small-angle neutron scattering reveals ferromagnetic clusters of manganese atoms that occur within the paramagnetic matrix of La(sub 0.67)Ca(sub 0.33)MnO(sub 3). With the application of a magnetic field, these clusters grow and their number decreases. Moreover, between T(sub c) and 1.8T(sub c), the material shrinks on cooling less rapidly than theory predicts with a sharp return to the theoretical curve on cooling below T(sub c)=260 K.

Author: Goodenough, John B., Zhou, J. -S.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
Perovskite, Phase shift (Nuclear physics)

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Oxide-ion conductors by design

Article Abstract:

It has been possible to identify a novel oxide-ion electrolyte that presents a large structural family to be investigated. It is suggested that partial substitution of oxygen for vacancies occupied by lone pairs could be a very good design strategy for identifying new intrinsic-vacancy oxide-ion conductors.

Author: Goodenough, John B.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000

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Designing fast oxide-ion conductors based on La2Mo2O9

Article Abstract:

It has been possible to identify a family of solid oxides based on the parent compound La2Mo2O9 which shows fast oxide-ion conducting properties. This material experiences a structural transition around 580 degrees C, leading to a rise in conduction by almost two orders of magnitude.

Author: Lacorre, Philippe, Goutenoire, Francois, Bohnke, Odile, Retoux, Richard, Laligant, Yvon
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
Thermal properties

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Subjects list: Research, Oxides, Ion exchange
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