Person:
KÜÇÜK, NİL

Profile Picture

Email Address

Birth Date

Research Projects

Organizational Units

OrgUnit Logo
Organizational Unit

Job Title

Last Name

KÜÇÜK

First Name

NİL

Name

Filters

2019 - 201922020 - 20211
Reset filters

Settings

Search Results

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Publication
    Synthesis and characterization of graphene nanoplatelet-La₀.₇Ca₀.₃MnO₃ composites
    (Taylor & Francis, 2019-07-11) Küçük, İlker; Tekgül, Atakan; Sarlar, Kağan; Civan, Ersin; Küçük, Nil; Macan, Barış; KÜÇÜK, İLKER; Tekgul, Atakan; Sarlar, Kağan; KÜÇÜK, NİL; Macan, Barış; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0001-6737-3838; 0000-0002-8871-2357; 0000-0002-9193-4591; AAI-6808-2021; P-2124-2016; B-8159-2016; GXN-2736-2022; CCH-1761-2022; DGC-7162-2022
    La₀.₇Ca₀.₃MnO₃ perovskite and its composites with graphene nanoplatelet (GNP) were prepared using a wet chemical method. The structural, magnetic and magnetocaloric properties of La₀.₇Ca₀.3MnO₃: GNP composites were investigated to determine the effect of GNPs. The results of XRD analysis show that the synthesised powders can be almost indexed to pure phase orthorhombic La₀.₇Ca₀.₃MnO₃. The magnetic measurements demonstrate that 0.7 and 1% GNP amounts cause an increase in the Curie temperature (T-C), and for larger amounts of GNP, the T-C monotonically decreases, except for the sample with 10% GNP. The results obtained from the Arrott plots show that the magnetic phase transition of the samples transforms from the first to second order with increasing GNP amount. The changes in the magnetocaloric properties are interpreted in terms of perovskite phase formations via structural analysis. The amounts of graphene nanoplatelets in the oxide powders are correlated with the observed magnetocaloric properties. The best magnetocaloric performance with the maximum magnetic entropy change of 3.99 Jkg(-1)K(-1) and refrigeration capacity of 90 Jkg(-1) was obtained at a 2 T magnetic field.
  • Thumbnail Image
    Publication
    Thermoluminescence characteristics of terbium doped zinc borates
    (Mdpi, 2019-10-23) Küçük, Nil; KÜÇÜK, NİL; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-9193-4591; AAI-6808-2021
    In this work, structural and thermoluminescence (TL) characteristics for ZnB2O4:xTb(3+) (x = 0.01, 0.02, 0.03, 0.04, 0.05, and 0.10 mole) phosphors were investigated. The phosphors were prepared via synthesis of nitric acid. The X-ray diffraction (XRD) studies show that the synthesized samples can be indexed to nearly single-phase cubic ZnB2O4. The TL characteristics following Sr-90 beta irradiation (40 mCi) were studied. TL intensity is found to depend on Tb concentration. The optimal concentration of the doped Tb3+ is 0.03 mol in TL measurements. TL dose responses of the phosphors to beta doses of 0.143, 0.715, 1.43, 15, 30 and 60 Gy showed fairly linear behavior. The minimum detectable dose (MDD) value for ZnB2O4:0.04Tb(3+) was found to be 87 mGy. The kinetic parameters of the ZnB2O4:0.03Tb(3+) sample were estimated by the glow curve deconvolution, the initial rise, the curve fitting, and the peak shape methods. The results indicate that these phosphors are thought to be promising candidates as TL materials. The results provide valuable knowledge of the characteristics of Tb-doped ZnB2O4 for use in dosimetry research.
  • No Thumbnail Available
    Publication
    Structural and magnetocaloric properties of feni high entropy alloys
    (IOP Publishing, 2021-12-01) Sarlar, Kağan; Tekgül, Atakan; Küçük, Nil; Etemoğlu, Akın Burak; Tekgül, Atakan; KÜÇÜK, NİL; ETEMOĞLU, AKIN BURAK; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; 0000-0001-6737-3838; 0000-0002-9193-4591; 0000-0001-8022-1185; ABE-9423-2020; GXN-2736-2022; AAI-6808-2021
    In this study, a new Fe30.7Ni25.7Ga14.6Mn19Si10 without rare earth element high entropy alloy's (HEA) magnetocaloric properties was investigated. The HEA was formed by the suction-casting method. x-ray diffraction (XRD) method was performed for structural analysis. XRD analysis show that both the as-quenched and annealed alloy have a single body centred cubic(bcc) structure. The result obtained from the Arrott plots indicates that the alloys have the second order magnetic phase transition. The transition temperature from paramagnetic to ferromagnetic transition was observed at 442 K and 462 K for the as-quenched and annealed alloy, respectively. The Fe30.7Ni25.7Ga14.6Mn19Si10 HEA shows magnetic entropy change such as 0.75 Jkg(-1) K-1 for as-quenched alloy, 0.90 Jkg(-1) K-1 for annealed alloy at 2 T magnetic field.