Şaşmaz Kuru, Tuğba

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Tuğba, Şaşmaz Kuru
T. Sasmaz Kuru
Kuru, S.
Kuru, T.
T.,Şaşmaz Kuru
Şaşmaz Kuru T.
Kuru Tuğba Şaşmaz
Şaşmaz Kuru, Tuğba
T. Ş. KURU
Tugba S. Kuru
T. S. Kuru
Kuru, Tugba
KURU Tugba Sasmaz
Tuğba Şaşmaz KURU
Tuğba Şaşmaz Kuru
T., Şaşmaz Kuru
T. Şaşmaz Kuru
Kuru Tugba Sasmaz
Kuru, Ş.
Tuğba Ş. Kuru
Tugba Sasmaz Kuru
Tugba Sasmaz KURU
T. Ş. Kuru
KURU Tuğba Şaşmaz
Kuru, Tuğba
Kuru T.
T. S. KURU
Kuru, Sasmaz
Kuru, Şaşmaz
Şaşmaz, Tuğba Kuru

Job Title

Dr.Öğr.Üyesi

Email Address

tugba.sasmaz@okan.edu.tr

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Scholarly Output

12

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12

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Now showing 1 - 10 of 12

Citation Count: 11
Synthesis and investigation of structural, dielectric, impedance, conductivity and humidity sensing properties of Cr³⁺-substituted Mg-Zn ferrite nanoparticle
(Springer Heidelberg, 2020) Kuru, Tugba Sasmaz; Radyoterapi / Radiotherapy
In this study, structural, dielectric, impedance and humidity properties of Cr3+-doped Mg-Zn ferrite, produced by co-precipitation method, have been investigated. Structural, morphological and compositional analyses were studied by XRD, SEM and EDX, respectively. The X-ray diffraction result shows that Mg0.75Zn0.25Cr0.2Fe1.8O4 crystallizes in the cubic spinel structure with the space group of Fd3m. The lattice constant and crystal size of the sample were calculated as 8.4046 angstrom and 11.29 nm. The dielectric and impedance properties were investigated in the frequency range between 20 and 10 MHz and in the temperature range from 290 to 710 K. The dielectric results are supported by Maxwell-Wagner polarization principles. Relaxation mechanism of the sample is explained by Nyquist graph. According to the impedance results, relaxation process is compatible with Cole-Cole model. The conductivity mechanism of the sample is explained by the mechanism of correlated barrier hopping (CBH) model. Finally, the humidity sensing properties of sample were investigated by impedance measurements in the range of 25-90 RH % at room temperature.
Citation Count: 13
Humidity sensing properties of ferrite based Al-Cd nanoparticles as a fast response sensor device
(Elsevier Science Sa, 2016) Kuru, T. Sasmaz; Senturk, E.; Radyoterapi / Radiotherapy
The humidity sensing performance of Al-Cd ferrite nanoparticle manufactured by chemical co-precipitation method. The humidity sensing properties of the presented Al-Cd ferrite sensor was investigated by exposing it to a broad humidity range of 15-90% at room temperature. The humidity sensing properties of the sample was tested by impedance measurements by varying the relative humidity from 15 to 95%. According to the investigation, samples impedance decreases sharply, it has an acceptable sensitivity, quick response and recovery time, a narrow hysteresis and good long term stability. Also its dependence of complex impedance spectra, measured on the relative humidity, operating temperature and on the measuring frequency is shown and explained. (C) 2016 Elsevier B.V. All rights reserved.
Citation Count: 0
Effect of calcination temperature on structural, magnetic, and dielectric properties of Mg_0.75Zn_0.25Al_0.2Fe_1.8O₄ ferrites
(Springer, 2024) Kuru, Tugba Sasmaz; Radyoterapi / Radiotherapy
Based on the desire to improve material properties, the effects of temperature have begun to be investigated. It was found that for nano-sized powder materials, such as ferrites, the structural properties like crystal structure and grain size, as well as many magnetic and electrical properties depending on them, change with the calcination temperature. Considering these changes, the effect of calcination temperature on the structural, magnetic, and electrical properties of MZA ferrites (Mg0.75Zn0.25Al0.2Fe1.8O4) prepared by co-precipitation was investigated in this study. The produced MZA ferrites were calcined at three different temperatures (600, 700, and 800 C-degrees). The X-ray diffraction results showed that the samples exhibited a cubic spinel structure. It was found that the crystal sizes (D_sch) calculated using the Debye-Scherrer equation increased with increasing calcination temperature (22.47, 33.53, and 42.53 nm). From the Williamson-Hall (W-H) plots, crystal sizes were calculated almost same as Debye-Scherrer crystal sizes. The nano-sized particles were examined by scanning electron microscope (SEM). Elemental analysis was performed using EDX. nu(1) and nu(2) absorption bands and O-H and C-H vibrations were detected in the FTIR spectra. Magnetic measurements were carried out at room temperature and in the range of +/- 60 kOe under the applied field. Magnetic results are explained by superparamagnetism. Dielectric measurements were performed at room temperature and a frequency range of 20 Hz to 10 MHz. The dielectric properties can be explained by Maxwell-Wagner theory. Impedance spectroscopy study revealed that the relaxation mechanism is consistent with the Cole-Cole model. In AC conductivity studies at room temperature, it was found that the sample calcined at 600 C-degrees would be suitable for energy storage devices.
Citation Count: 25
Structural, dielectric and humidity properties of Al-Ni-Zn ferrite prepared by co-precipitation method
(Elsevier Science Sa, 2018) Kuru, Tugba Sasmaz; Kuru, Mehmet; Bagci, Sadik; Radyoterapi / Radiotherapy
Al0,2Ni0,3Zn0,5Fe2O4 ferrite nanoparticles have been synthesized by chemical co-precipitation method and structural characterization has been analyzed using X-Ray diffraction (XRD) and scanning electron microscopy (SEM). XRD analysis indicates that Al0,2Ni0,3Zn0,5Fe2O4 ferrite nanoparticles crystallize in the cubic spinel phase. To determine the electrical properties of the sample, the real and imaginary parts of the dielectric constant have been investigated to a frequency range from 20 Hz to 10 MHz for 31 test frequencies. These measurements have been also repeated for different temperatures. The impedance analysis of the sample was carried out using Nyquist curves. The variation of the conductivity of the sample is also shown for the 31 test frequencies and the different temperature values in the range between 293 K and 733 K. The DC conductivity of the Al0,2Ni0,3Zn0,5Fe2O4 as a function of temperature is also presented and the measurements confirm that the sample exhibits semiconductor behavior in accordance with the literature. Finally, the relative humidity, frequency and impedance map of the sample has been investigated in detail. (c) 2018 Elsevier B.V. All rights reserved.
Citation Count: 12
Dielectric, humidity behavior and conductivity mechanism of Mn_0.2Ni_0.3Zn_0.5Fe₂O₄ ferrite prepared by co-precipitation method
(Springer, 2018) Kuru, Tugba Sasmaz; Kuru, Mehmet; Bagci, Sadik; Radyoterapi / Radiotherapy
Mn-Ni-Zn ferrite with the chemical formula of Mn0.2Ni0.3Zn0.5Fe2O4 was prepared by co-precipitation method. The X-ray diffraction (XRD) results show that the prepared sample crystallizes in the cubic spinel structure with the space group of Fm3m. The morphological analysis of the sample was investigated by scanning electron microscopy (SEM). The dielectric properties of Mn0.2Ni0.3Zn0.5Fe2O4 ferrite were studied in a frequency range from 20 Hz to 10 MHz and at a temperature range from 293 to 733 K. The dielectric constant decreases with the increasing frequency for all the temperature values chosen. The AC conductivity mechanism was found the small polaron type of conductivity, and in addition to that, the DC conductivity can be explained by Arrhenius type conductivity. According to the dielectric results, relaxation process fits Cole-Cole model. Finally, the effect of the relative humidity upon the impedance of the sample was discussed for a frequency range between 20 Hz and 10 MHz. It is found that the impedance values decrease almost linearly with the increasing % RH (relative humidity) values at low frequencies, while the impedance of the sample is independent of % RH at high frequencies.
Citation Count: 5
Structural, electrical and magnetic characterization of Al³⁺ substituted Mg-Zn ferrites
(Springer Heidelberg, 2022) Kuru, Mehmet; Kilic Dokan, Fatma; Sasmaz Kuru, Tugba; Radyoterapi / Radiotherapy
The purpose of this research is to examine the change with Al3+ contribution in structural, magnetic, and electrical properties of Mg0.75Zn0.25AlxFe2-xO4 (x=0, 0.2, 0.4) ferrites fabricated by co-precipitation technique. The characteristics of samples are investigated using XRD, SEM, FTIR, VSM, and impedance spectroscopy. XRD characterization confirmed that the samples were in cubic spinel structure with Fd/3 m space group. The crystallite size was concluded from broadening the diffraction peaks using the Debye-Scherrer's (D-s) and Williamson-Hall (DW-H) method. The crystal sizes D-s (from 24.22 to 36.94 nm) and DW-H (from 19.01 to 28.99 nm) of the Mg-Zn ferrites samples increased with Al3+ contribution. FTIR spectra show the presence of characteristic absorption bands of ferrites named as nu(1) and nu(2), one in the range of 550-577 and the other in the range of 475-478. The M-H hysteresis loops of all samples in the range of +/- 60 kOe showed the superparamagnetic behavior with small M-r and H-c values. The H-c increased from 128.3 to 265.1Oe while the M-s decreased from 7.34 to 4.43 emu/g with increasing of the Al3+ substitution. The changes in dielectric properties such as AC conductivity (sigma(AC)) dielectric constant (epsilon', epsilon ''), loss factor (tan theta), impedance (Z' ,Z '') and modulus (M', M '') of samples were investigated. Imaginary dielectric constant (epsilon '') increase from 713 to 4.4 x 10(6) with rising of the Al3+ substitution at 20 Hz. Finally, according to the Nyquist graphs drawn using the modulus values, it has been shown that the materials are compatible with the Debye model.
Citation Count: 20
The role of the calcium concentration effect on the structural and dielectric properties of mixed Ni-Zn ferrites
(Springer, 2019) Kuru, Mehmet; Kuru, Tugba Sasmaz; Bagci, Sadik; Radyoterapi / Radiotherapy
The calcium substituted nickel-zinc ferrites with the formula of CaxNi0.75-xZn0.25Fe2O4 (x=0, 0.25, 0.5 and 0.75) have been prepared by using the chemical co-precipitation method. The X-ray diffraction (XRD) analyses reveal the results that all the samples crystallize in cubic spinel structure and the lattice constants of the samples for x=0, 0.25, 0.50 and 0.75 are found to be 8.334, 8.348, 8.380 and 8.538 angstrom, respectively. The crystallite size of the samples, obtained from Debye Scherrer's equation, varies between 12nm and 27nm. The scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) analyses have been conducted to reveal and determine the morphology and stoichiometry of all the prepared CaxNi0.75-xZn0.25Fe2O4 ferrite samples. The SEM images show that the partical sizes for all the samples are at nano size in accordance with the XRD results and EDX results confirm the contents of the produced samples. The dielectric and impedance properties of the prepared ferrite samples have been investigated in the frequency range from 20Hz to 10MHz and in the temperature range from 350 to 700K. The real and imaginary parts of dielectric constant, tan , AC and DC conductivity values decrease with increasing calcium content (except x=0). Contrary to this behavior, real and imaginary parts of impedance increase with increasing calcium content. The general AC conductivity behavior of all samples is like semiconductor behavior. The conductivity mechanism of the sample with x=0 is explained by the mechanism of correlated barrier hopping (CBH), while it has turned into overlapping large polaron tunneling (OLPT) mechanism for all other samples. From the relaxation time graphs obtained from the impedance data, activation energies of the grain and grain boundaries are obtained. The Nyquist plots are also presented in the temperature range of 350-700K to determine the conductivity mechanism of the prepared samples and all the plots show only one semi-circle, which means that the dominant transmission comes from the grain boundaries.
Citation Count: 0
TUNABILITY PROPERTIES OF MICA POWDERS INLAID NR/SBR MATERIAL
(2016) Akçakale, Nurettin; Şaşmaz, Tuğba Kuru; Radyoterapi / Radiotherapy
NR (natural rubber) and SBR (synthetic rubber) elastomers are have in a wide range of applications due to their interesting properties. These are primarily in the automotive, aerospace, machinery manufacturing, construction and shoe industry [1,2]. NR/SBR based materials have increasingly attention with some different additions. In this study, dielectric tunability properties of the mica powder inlaid NR/SBR elastomer have been by using dielectric spectroscopy. The dielectric constant of the sample has been measured by using a LCR meter in the interval of 0-2500 V/m electric field. The measurements have been carried out at some fixed frequencies starting from 100 Hz. The dielectric constant depends on frequency and applied electric field. It decreases with the increase of frequency and applied field. The decreasing proportion of the dielectric constant with applied field decreases with increasing frequency. Finally, it is constant with applied field at high frequencies. The properties of the sample have been explained with tunability properties of the sample.
Citation Count: 4
Room temperature structural, dielectric, and conductivity properties of Al_xCd_1-xFe₂O₄ ferrites
(Springer, 2020) Kuru, Tugba Sasmaz; Radyoterapi / Radiotherapy
The purpose of this study is to investigate dielectric and conduction mechanisms in accordance with composition at room temperature. In this study, AlxCd1-xFe2O4 ferrites with different stoichiometric rates (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) were prepared through co-precipitation method. The precipitated powder was sintered at 800 degrees C for 8 h to form the pure spinel ferrite nanoparticle. The formation of the cubic spinel phase has been demonstrated by X-ray diffraction analysis. The resulting powder was shown to be nanosized. Experiments were performed at room temperature in the frequency range of 20 Hz to 10 MHz. Frequency-dependent dielectric permittivity and dielectric loss for all examined samples exhibit the dielectric relaxation phenomenon explained by the Maxwell-Wagner polarization. Dielectric constant, AC conductivity, and dielectric loss decreased with increasing frequency. Dielectric constant, dielectric loss, and AC conductivity decreased along with increasing stoichiometric ratio x = 0 to 0.5. However, deviations in the intermediate values were observed, and the values of 0.2 were between 0 and 0.1 and the values of 0.3 were between 0.4 and 0.5. The impedance analysis explained the role of grains and grain boundaries within prepared samples. As a result, it was found that the relaxation process was compatible with the Cole-Cole model.
Citation Count: 1
The Effect of Al³⁺ Additive on the Structural, Optical, and Magnetic Properties of Al-Cd Ferrites Fabricated by Coprecipitation Method
(Polish Acad Sciences inst Physics, 2018) Kuru, T. Sasmaz; Eyupoglu, V.; Yildiz, F.; Radyoterapi / Radiotherapy
In the present study, Al-Cd ferrites of nominal composition AlxCd1-xFe2O4 (x = 0-0.5) were prepared by coprecipitation method. The effect of Al+3 additive on the structural, optical, and magnetic properties of the as-prepared Al-Cd ferrites was investigated. Samples were characterized by X-ray diffraction, scanning electron microscopy, the Fourier transform infrared spectroscopy, UV spectroscopy and vibrating sample magnetometer techniques. The magnetic analysis indicated that all of the samples in different compositions showed ferromagnetic behavior. Along with the X-ray diffraction patterns, the formation of single-phase cubic spinel structure and the lattice parameter were identified in the range of 8.6492-8.6984 A. Scanning electron microscopy measurements showed that the smallest ferrite nanoparticles were obtained when the stoichiometric composition factor (x) value was 0.4. As an additional characterization, the Fourier transform infrared spectra was investigated, and the characteristic absorption, bands belonging to ferrite nanoparticles were identical around 530 cm(-1) and 430 cm(-1). The tetrahedral and the octahedral complex formation was proved by the observation of higher frequency (nu(1)), and lower frequency (nu(2)) bands by Fourier transform infrared method, respectively. UV-Vis characterization performed for the determination of E-g values depending on changing Al concentration and found as 2.07-2.24 eV. From the magnetic measurements, all the Al-doped Cd ferrites exhibit S-shaped narrow hysteresis loops revealing soft ferromagnetic nature of the formed ferrites.

Şaşmaz Kuru, Tuğba

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