Researcher:
Zor, Ceren

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Ceren

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Zor

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Zor, Ceren

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2016 - 20182

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    PublicationOpen Access
    LiMg0.1Co0.9BO3 as a positive electrode material for Li-ion batteries
    (Royal Society of Chemistry (RSC), 2018) Afyon, Semih; Department of Chemistry; Zor, Ceren; Somer, Mehmet Suat; Researcher; Faculty Member; Department of Chemistry; College of Sciences; Graduate School of Sciences and Engineering; N/A; 178882
    LiCoBO3 could be a promising cathode material given the electronic and ionic conductivity problems are addressed. Here, Mg substitution in LiCoBO3 is employed to stabilise the structure and improve the electrochemical performance. LiMg0.1Co0.9BO3 is synthesised for the first time via sol-gel method and Mg substitution in the structure is verified by X-ray powder diffraction and energy dispersive X-ray analyses. The electrochemical properties are investigated by galvanostatic cycling and cyclic voltammetry tests. The composite electrode with conductive carbon (reduced graphite oxide and carbon black) delivers a first discharge capacity of 32 mA h g(-1) within a 4.7-1.7 voltage window at a rate of 10 mA g(-1). The cycling is relatively stable compared to the unsubstituted LiCoBO3. Mg substitution may enhance the electrochemical performance of borate-based electrode materials when combined with suitable electrode design techniques.
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    PublicationOpen Access
    Effect of Co and Ni substitution on the two magnetostructural phase transitions in Fe1.12Te
    (American Physical Society (APS), 2016) Koz, Cevriye; Roessler, Sahana; Tsirlin, Alexander A.; Wirth, Steffen; Schwarz, Ulrich; Department of Chemistry; Zor, Ceren; Researcher; Department of Chemistry; College of Sciences
    Here we present the results of high-resolution x-ray diffraction experiments along with specific heat, resistivity, and magnetization measurements of chemically well-characterized Fe1.12-xMx Te (M = Co, Ni) samples. The motivation is to investigate how the two coupled magnetostructural phase transitions in the antiferromagnetic parent compound Fe1.12Te of chalcogenide superconductors can be tuned. While the two-step magnetostructural transition (tetragonal-to-orthorhombic followed by orthorhombic-to-monoclinic) persists in Fe1.10Co0.02Te, only one, tetragonal-to-orthorhombic transition was observed in Fe1.10Ni0.02Te. Upon increasing the Co and Ni substitution, the structural phase transitions and the long-range magnetic order are systematically suppressed without any sign of superconductivity. For high substitution levels (x >= 0.05), a spin-glass-like behavior was observed and the low-temperature structure remains tetragonal. From our results, it can be inferred that the electron doping strongly suppresses the magnetostructural phase transitions.