XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
155
T1: P–22
Synthesis and characterization of micro-structure ZnFe
2
O
4
films onto
ZnO seed layer depending on the complex agent
Emin Yakar
1
, and Fatma Özütok
2
1
Materials Science and Engineering, Çanakkale Onsekiz Mart University, Terzioğlu Campus, Turkey
2
Physics Department, Çanakkale Onsekiz Mart University, Terzioğlu Campus, Turkey,
e-mail: fatmaozutok@comu.edu.tr
Nowadays, further need to Zn-based ferrite materials in high frequency applications such as
planar inductors, waveguides and phase shifters they can gain much more attention [1]. On the
other hand, complex agent is one of the most important parameter in chemical bath deposition
[2]. In this study, zinc ferrite films deposited by chemical bath onto ZnO seed layer (ITO was
the substrate) [3] depending on the complex agent (complex agent was choosen as ammonia and
ratio were changed 4, 6 and 8%) at 30±5°C and dried at 120°C. All films have cubic spinel zinc-
ferrite crystal structure and (220) direction is the preferential orientation for each film. The
optical transperancy higher than 80% and the most obvious defect-related peak observed at 650
nm for all samples. The surface morphology changing determined from 6% sample to 8%
sample. Maximum Zn- and Fe- elemental composition observed in 8% sample. The most
prominent bands in 440, 570 and 1106 cm
–1
which were associated with Fe–O, Zn–O and O–H
stretching vibration modes, respectively. The results showed that as a complex agent ammonia
has a substantial effect on the zinc-ferrite films and studies can be expanded for other complex
agents such as TEA, MEA, DEA etc. in the forthcoming.
Keywords: ZnFe
2
O
4
films; ZnO seed layer; chemical bath deposition; complex agent; FTIR spectra
Acknowledgment
This work was supported by the Council of Scientific Research Project (Grant number: FBA-2017-1265).
References
[1] G. Dangwei, Z. Jingyi, Y. Yuancai, F. Xiaolong, C. Guozhi, S. Wenbo, Z.Zhengmei, X.Desheng, J.
Appl. Phys. 107 (2010) 043903.
[2] Z.Hui, M.Xiangyang, Mater. Lett. 58 (2003) 5.
[3] Ö.Fatma, D. Sani, Digest J. Nanomater. Biostruct. 12 (2017).
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
156
T1: P–23
Synthesis, crystal growth and characterization of Zn
0.5
Mn
0.5
Te single
crystal grown by Bridgman technique
D. Joseph Daniel1, A. Raja
2
, P. Ramasamy
2
, and H. J. Kim
1
1
Department of Physics, Kyungpook National University, Daegu 702-701, South Korea
2SSN Research Centre, SSN College of Engineering, kalavakkam, Tamilnadu- 603 110,
e-mail: hongjooknu@gmail.com, hongjoo@knu.ac.kr
Semi magnetic semiconductors are generally known as a semiconducting compound is
characterized by the substitution of a fraction of the original atoms by magnetic atoms.
Crystallographic properties of the ternary AI1-xMnxBVI semiconductors are thoroughly studied
[1]. Zn0.5Mn0.5Te polycrystalline compound has been synthesized by using melt oscillation
method. The crystalline phase purity of the prepared compound confirmed by powder X-ray
diffraction analysis. Single crystal was grown by using vertical Bridgman method. The
photograph of cut and polished crystal is shown in Fig.1. The XRD pattern indicates that the
grown crystal belongs to the cubic crystal system with the lattice constant of a = 6.182 Å and
space group F-43m [2]. The stoichiometric composition of the grown crystal was analyzed using
energy dispersive spectrometry. Optical properties of the grown crystal have been assessed by
UV-Vis-NIR and Fourier transform infrared spectroscopy analysis. And Furthermore, the
electrical properties of the grown crystal will be presented in detail.
Fig. 1. Photograph of cut and polished crystal
Keywords: polycrystalline; crystal growth; X-ray diffraction
Acknowledgment
These investigations have been funded by the Ministry of Science and Technology, Korea (MEST)
(No.2015R1A2A1A13001843).
References
[1] W. Giriat, J.K. Furdyna, Semiconductors and Semimetals 25 (1988) 1.
[2] R.F Juza, A. Rabenau, G.Z. Pascher, Anorg. Allg. Chem. 285 (1956) 61.
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
157
T1: P–24
Perovskite structured Ce
3+
activated NaMgF
3
phosphor synthesised by
hydrothermal method and its optical properties
D. Joseph Daniel1, A. Raja
2
, P. Ramasamy
2
, and H. J. Kim
1
1
Department of Physics, Kyungpook National University, Daegu 702-701, South Korea
2SSN Research Centre, SSN College of Engineering, kalavakkam, Tamilnadu- 603 110,
e-mail: hongjooknu@gmail.com, hongjoo@knu.ac.kr
Rare earths doped mixed fluoride phosphors have been investigated thoroughly in the past
due to the potential of optical applications in several areas including luminescence,
optoelectronics, lighting, radiation detection systems and medical applications. The
hydrothermal synthesis method has risen to become one of the most promising methods for
materials synthesis in the last decade and it is a simple solution based and cost effective method
[1]. We present an environment friendly hydrothermal process to synthesize nano/sub micro
particles of the complex fluoride NaMgF
3
at 180°C. The tittle compound synthesis was carried
out at elevated pressure and temperature in an aqueous medium. Powder X-ray diffraction
(XRD) pattern was carried out to check the phase purity of the synthesised compounds.
Synthesized compounds were micro and nanocrystalline with orthorhombic perovskite crystal
structures. In order to identify the functional groups Fourier Transform Infrared spectral analysis
has been performed. The size and morphology of the synthesised samples were investigated by
using Field Emission - Scanning Electron Microscopy (FE-SEM) micrographs at room
temperature and shown in Fig. 1. The chemical composition and purity of the synthesised
compounds were confirmed by the energy – dispersive X-ray spectroscopy (EDX) results.
Optical absorption spectrum was recorded for as-synthesized powder. The absorption bands of
Ce
3+
ions with peaks 205, 220 and 270 nm were observed in the NaMgF
3
:Ce
3+
.The
Photoluminescence sharp emission was observed at 324 nm and is related to the 5d-4f
transitions in Ce
3+
.
Fig. 1. FE-SEM images of as prepared NaMgF3 compound.
Keywords: hydrothermal; perovskite; luminescence
Acknowledgment
This investigations was financially supported by the Ministry of Science and Technology, Korea (MEST)
(No.2015R1A2A1A13001843).
References
[1] N. Rajeswari Yogamalar, A. Chandra Bose, Appl. Phys. A 103 (2011) 33.
Dostları ilə paylaş: |