AgNb7O18: an ergodic relaxor ferroelectric.
Inorg Chem
; 53(17): 8941-8, 2014 Sep 02.
Article
en En
| MEDLINE
| ID: mdl-25116375
ABSTRACT
AgNb7O18 is a relaxor ferroelectric with a Burns temperature of ~490 K and an incipient transition to the nonergodic state. The short-range structure is shown by convergent-beam electron diffraction to have the polar space group Im2m, but refinements against powder X-ray diffraction find the long-range structure to have the centrosymmetric space group Immm. Relaxor behavior in AgNb7O18 appears to originate from the partial occupation of large interstices by Ag(+) cations. Both cations and oxygen anions are displaced away from zones where NbO6 octahedra are edge-sharing.
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MEDLINE
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En
Revista:
Inorg Chem
Año:
2014
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Article
País de afiliación:
Reino Unido