Biocompatible ferroelectric (Na,K)NbO{sub 3} nanofibers

Journal Article · Mon Jan 02 00:00:00 EST 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3673282· OSTI ID:22025389

Jalalian, A ^[1]; Grishin, A M ^[1]

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1. Department of Condensed Matter Physics, KTH Royal Institute of Technology, SE-164 40, Kista (Sweden)

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{sub 1g}({nu}{sub 1}) mode compared with polar axis defined F{sub 2g}({nu}{sub 5}) and E{sub g}({nu}{sub 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.

• OSTI ID: 22025389
• Journal Information: Applied Physics Letters, Vol. 100, Issue 1; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
CALCINATION
CERAMICS
FERROELECTRIC MATERIALS
FIBERS
NANOSTRUCTURES
NIOBATES
ORTHORHOMBIC LATTICES
POLARIZATION
POLYCRYSTALS
POTASSIUM COMPOUNDS
RAMAN SPECTRA
SINTERING
SODIUM COMPOUNDS
SOL-GEL PROCESS
TEMPERATURE RANGE 0273-0400 K
TEXTILES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION