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Biocompatible ferroelectric (Na,K)NbO(3) nanofibers
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, no 1, 012904- p.Article in journal (Refereed) Published
Abstract [en]

Dense homogeneous textile composed from continuous bead-free sodium potassium niobate (NKN) nanofibers 100 mu m long and 50-200 nm in diameter was sintered by sol-gel calcination assisted electrospinning. High resolution electron microscopy and x-ray diffraction revealed preferential cube-on-cube growth of fibers in [001] direction. Raman spectrum of NKN fibers contains all the features characteristic to electrically poled orthorhombic phase. In contrast to polycrystalline ceramics, it shows relative enhancement of the Raman cross section of isotropic A(1g)(nu(1)) mode compared with polar axis defined F(2g)(nu(5)) and E(g)(nu(2)) vibrations. We interpret this as an evidence for superparaelectric state of NKN nanofibers. Spontaneous polarization inside highly crystalline nanofiber exists at room temperature though big distance between fibers prevents the settling of a net macroscopic polarization.

Place, publisher, year, edition, pages
2012. Vol. 100, no 1, 012904- p.
Keyword [en]
NA0.5K0.5NBO3 THIN-FILMS, DIELECTRIC-PROPERTIES, CERAMICS, NIOBATE
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-83785DOI: 10.1063/1.3673282ISI: 000298966200045Scopus ID: 2-s2.0-84855523815OAI: oai:DiVA.org:kth-83785DiVA: diva2:513739
Note
QC 20120403Available from: 2012-04-03 Created: 2012-02-13 Last updated: 2017-12-07Bibliographically approved

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Jalalian, AbolfazlGrishin, Alexander M.
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