Biocompatible ferroelectric (Na,K)NbO(3) nanofibers
2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, no 1, 012904- p.Article in journal (Refereed) Published
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  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.
NA0.5K0.5NBO3 THIN-FILMS, DIELECTRIC-PROPERTIES, CERAMICS, NIOBATE
IdentifiersURN: urn:nbn:se:kth:diva-83785DOI: 10.1063/1.3673282ISI: 000298966200045ScopusID: 2-s2.0-84855523815OAI: oai:DiVA.org:kth-83785DiVA: diva2:513739
QC 201204032012-04-032012-02-132012-04-03Bibliographically approved