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CONDUCTIVITY AND NEGATIVE-U FOR IONIC GRAIN-BOUNDARIES

DUFFY, DM; STONEHAM, AM; (1983) CONDUCTIVITY AND NEGATIVE-U FOR IONIC GRAIN-BOUNDARIES. J PHYS C SOLID STATE , 16 (21) 4087 - 4092. 10.1088/0022-3719/16/21/009. Green open access

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Abstract

The authors show that charge-transfer excitations (like 2M2+ to M++M3+) can be lowered greatly in energy near grain boundaries, where sites are no longer equivalent. In special cases the excitations may be exothermic ('negative-U' behaviour); likely cases include (320) and (122) grain boundaries in FeO. Consequences include effects on conductivity, segregation of impurities with different valence, and on other charge-state-dependent properties.

Type: Article
Title: CONDUCTIVITY AND NEGATIVE-U FOR IONIC GRAIN-BOUNDARIES
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0022-3719/16/21/009
Publisher version: http://dx.doi.org/10.1088/0022-3719/16/21/009
Language: English
Additional information: Text made available to UCL Discovery by kind permission of IOP Publishing, 2012
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/66115
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