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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003305naa a2200409 4500
001oai:DiVA.org:kth-89029
003SwePub
008120214s2006 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-890292 URI
0247 a https://doi.org/10.1103/PhysRevB.73.0641142 DOI
040 a (SwePub)kth
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Buscaglia, M. T.4 aut
2451 0a High dielectric constant and frozen macroscopic polarization in dense nanocrystalline BaTiO3 ceramics
264 1c 2006
338 a print2 rdacarrier
500 a QC 20120307
520 a Theoretical models for small ferroelectric particles predict a progressive decrease of the Curie temperature, spontaneous lattice strain, and polarization until the critical size corresponding to transition to the cubic phase and disappearance of ferroelectricity is reached. In contrast, the behavior of nanocrystalline BaTiO3 ceramics with a grain size of approximate to 30 nm is dominated by extrinsic effects related to the grain boundaries which mask the expected downscaling of properties. While the noncubic crystal structure, the high dielectric constant (approximate to 1600) and the variation of permittivity with temperature suggest a ferroelectric behavior, very slim, and nearly linear polarization hysteresis loops are observed. Evidence for the existence of a ferroelectric domain structure with domains extending over several grains and of polarization switching at local scale is given by piezoresponse force microscopy. The suppression of macroscopic ferroelectric hysteresis and switching originates from a frozen domain structure stable under an external field owing to the effects exerted by the grain boundaries, such as the clamping of the domain walls and the hindrance of polarization switching. Furthermore, the depolarization field originated by the low-permittivity nonferroelectric grain boundaries can cause a significant reduction of polarization. If the grain size is small enough, the ceramic is expected to undergo a "phase transition" to a polar phase with nonswitchable polarization. The BaTiO3 ceramics with grain size of 30 nm investigated in the present study are deemed to be close to this transition.
650 7a TEKNIK OCH TEKNOLOGIERx Materialteknikx Keramteknik0 (SwePub)205012 hsv//swe
650 7a ENGINEERING AND TECHNOLOGYx Materials Engineeringx Ceramics0 (SwePub)205012 hsv//eng
7001 a Viviani, M.4 aut
7001 a Buscaglia, V.4 aut
7001 a Mitoseriu, L.4 aut
7001 a Testino, A.4 aut
7001 a Nanni, P.4 aut
7001 a Zhao, Zhe,d 1973-u Department of Physical Inorganic and Structural Chemistry, Stockholm University4 aut0 (Swepub:kth)u1qw3zev
7001 a Nygren, M.4 aut
7001 a Harnagea, C.4 aut
7001 a Piazza, D.4 aut
7001 a Galassi, C.4 aut
7102 a Department of Physical Inorganic and Structural Chemistry, Stockholm University4 org
7730 t Physical Review B. Condensed Matter and Materials Physicsg 73:6q 73:6x 1098-0121x 1550-235X
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-89029
8564 8u https://doi.org/10.1103/PhysRevB.73.064114

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