title: Structural and dielectric properties of yttrium-substituted hydroxyapatites.
abstract: Hydroxyapatite (HAp) samples doped with 0, 2 and 4 at.% of yttrium (Y) were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy attached with energy dispersive X-ray (EDX) spectroscopy, antimicrobial activity tests and dielectric studies. The hydroxyl groups observed in FTIR spectra confirmed the formation of HAp phase in the studied samples. The crystallite size, crystallinity degree and lattice parameters of the samples were changed with Y content. The volume of the unit cell was gradually decreased with the addition of Y. Undoped and Y-containing HAp samples were screened to determine their in vitro antimicrobial activities against the standard strains. It was found that no samples have any antimicrobial effect. The relative dielectric permittivity and dielectric loss are affected by Y content. While the alternating current conductivity increases with increasing frequency, it decreases with increasing Y content.
authors.affiliation: Department of Physics, Faculty of Science, Firat University, 23119 Elazig, Turkey. Electronic address: okaygili@firat.edu.tr.
authors.forename: Omer
authors.initials: O
authors.lastname: Kaygili
authors.affiliation: Kudrinskaja sq. 1-155, 123242 Moscow, Russia.
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Dorozhkin
authors.affiliation: Department of Physics, Faculty of Science, Firat University, 23119 Elazig, Turkey.
authors.forename: Tankut
authors.initials: T
authors.lastname: Ates
authors.affiliation: Department of Microbiology and Clinic Microbiology, Inonu University, 44280 Malatya, Turkey.
authors.forename: N Canan
authors.initials: NC
authors.lastname: Gursoy
authors.affiliation: Department of Chemistry, Faculty of Science, Firat University, 23119 Elazig, Turkey.
authors.forename: Serhat
authors.initials: S
authors.lastname: Keser
authors.affiliation: Department of Physics, Faculty of Science, Firat University, 23119 Elazig, Turkey.
authors.forename: Fahrettin
authors.initials: F
authors.lastname: Yakuphanoglu
authors.affiliation: Technology Department, Saraykoy Nuclear Research and Training Centre, 06983 Ankara, Turkey.
authors.forename: A Birkan
authors.initials: AB
authors.lastname: Selçuk
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D003460:Crystallization / Q000379:methods; D006882:Hydroxyapatites / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D014961:X-Ray Diffraction / Q000379:methods; D015019:Yttrium / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D006882:Hydroxyapatites; D015019:Yttrium
keywords: Antimicrobial activity; Dielectric properties; Hydroxyapatite; X-ray diffraction (XRD); Yttrium (Y)