Linked Life Data

21673668

Source:http://linkedlifedata.com/resource/pubmed/id/21673668

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PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
2011-6-15
pubmed:abstractText
The unusual property of negative thermal expansion is of fundamental interest and may be used to fabricate composites with zero or other controlled thermal expansion values. Here we report that colossal negative thermal expansion (defined as linear expansion <-10(-4) K(-1) over a temperature range ~100 K) is accessible in perovskite oxides showing charge-transfer transitions. BiNiO(3) shows a 2.6% volume reduction under pressure due to a Bi/Ni charge transfer that is shifted to ambient pressure through lanthanum substitution for Bi. Changing proportions of coexisting low- and high-temperature phases leads to smooth volume shrinkage on heating. The crystallographic linear expansion coefficient for Bi(0.95)La(0.05)NiO(3) is -137×10(-6) K(-1) and a value of -82×10(-6) K(-1) is observed between 320 and 380 K from a dilatometric measurement on a ceramic pellet. Colossal negative thermal expansion materials operating at ambient conditions may also be accessible through metal-insulator transitions driven by other phenomena such as ferroelectric orders.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
2041-1723
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
2
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
347
pubmed:meshHeading
pubmed:year
2011
pubmed:articleTitle
Colossal negative thermal expansion in BiNiO3 induced by intermetallic charge transfer.
pubmed:affiliation
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan. mazuma@msl.titech.ac.jp
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't