scholarly journals Preparation, Structural Analysis, and Tunability of Optical and Dielectric Characteristics of Mn–modified SrLaLiTeO6 Double Perovskite

2021 ◽  
Author(s):  
MUHAMMAD ZHARFAN MOHD HALIZAN ◽  
ZAKIAH MOHAMED ◽  
AHMAD KAMAL HAYATI YAHYA
Keyword(s):  
Dopant Concentration ◽  
Electrochemical Impedance ◽  
Double Perovskite ◽  
Optoelectronic Device ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Dielectric Characteristics ◽  
Increasing Trend ◽  
Absorption Frequencies ◽  
Optoelectronic Device Application

Abstract SrLaLiTe 1- x Mn x O 6 ( x = 0.02, 0.04, 0.06, 0.08, 0.10) double perovskites have been prepared using solid state method. Studies on structural by applying X–ray diffraction (XRD) characterization found that all compounds formed in monoclinic, P2 1 /n symmetry with reduction of lattice parameters and unit cell volume as dopant concentration increased. The formation of Te 6+ /Mn 6+ –O–Li + octahedral structure can be confirmed with the presence of peaks at certain wavenumbers indicating vibrations of Te – O or Mn – O bonds. As dopant concentration increased, field emission scanning electron microscope (FESEM) characterization found that the increasing trend of formation in grains sizes from x = 0.02 to x = 0.08, and its effects towards dielectric properties which were conducted by electrochemical impedance spectroscopy (EIS) studies were discussed in this paper. Other discussions included were regarding the significant effect of dopant towards optical band gap, E opt and absorption frequencies of prepared compounds compared to pristine compound indicating its promising potential for optoelectronic device application.

scholarly journals Understanding the structural, optical, and dielectric characteristics of SrLaLiTe1−xMnxO6 perovskites

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Z. M. Halizan ◽  
Z. Mohamed ◽  
A. K. Yahya
Keyword(s):  
Optoelectronic Device ◽  
Solid State Reaction Method ◽  
Dielectric Study ◽  
Energy Storage Devices ◽  
Capacitive Energy Storage ◽  
Dielectric Characteristics ◽  
Storage Devices ◽  
Space Symmetry ◽  
Absorption Frequencies ◽  
Optoelectronic Device Application

AbstractIn electronic applications, good dielectric permittivity material has huge potential in the capacitive energy storage devices. Herein, in the present work the dielectric study of SrLaLiTe1−xMnxO6 (x = 0.02, 0.04, 0.06, 0.08, and 0.10) double perovskites has been studied and discussed. These compounds were prepared through solid-state reaction method. All of the prepared compounds were confirmed to crystallized in monoclinic structure of P21/n space symmetry with better crystallization when dopant concentrations increased until x = 0.08. The formation of Li–O–Te/Mn bonds in octahedral structures in all compounds were confirmed in this study. The existence of peaks at specific wavenumbers indicated vibrations of B–site cations’ bonds. When dopant amounts were increased from x = 0.02 to x = 0.08, there was an increasing trend of grains sizes formation in the compounds. The discussions on effects of grain sizes towards dielectric properties were included in this paper. Other important results and discussions comprised of the significant effects of dopant on the optical band gap (Eopt) and absorption frequencies of the compounds. The decreasing trend of Eopt towards semiconductor range indicated the compounds’ promising potentials for optoelectronic device application.

Electrochemical Performance of Mg-Doped Li2FeSiO4/C as Cathode Material for Lithium-Ion Batteries

2013 ◽  
Vol 310 ◽  
pp. 90-94 ◽  
Author(s):  
Xiao Bing Huang ◽  
Hong Hui Chen ◽  
Huang Rong Li ◽  
Qian Peng Yang ◽  
Shi Biao Zhou ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Rate Capability ◽  
Lithium Ion ◽  
Impedance Spectra ◽  
X Ray Diffraction ◽  
Electrochemical Impedance Spectra ◽  
Solid State Method ◽  
X Ray ◽  
Mg Doped ◽  
Discharge Test

Li2FeSiO4/C and Li1.97Mg0.03FeSiO4/C composites were successfully prepared by a solid-state method. Both samples were systematically investigated by X-ray diffraction(XRD), scanning electron microscopy(SEM), the charge-discharge test and electrochemical impedance spectra measurement, respectively. It was found that the Li1.97Mg0.03FeSiO4/C composite exhibited an excellent rate capability with a discharge capacity of 144mAh g-1 at 0.2C and 97mAh g-1 at 5C, and after 100 cycles at 1 C, 96% of its initial capacity was retained.

scholarly journals Structural, magnetic, and magnetocaloric properties of R2NiMnO6 (R = Eu, Gd, Tb)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
K. P. Shinde ◽  
E. J. Lee ◽  
M. Manawan ◽  
A. Lee ◽  
S.-Y. Park ◽  
...  
Keyword(s):  
Structural Investigation ◽  
Ceramic Powder ◽  
Double Perovskite ◽  
Considerable Change ◽  
Cooling Power ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Magnetocaloric Properties ◽  
Powder Samples ◽  
Group A

AbstractThe crystal structure, cryogenic magnetic properties, and magnetocaloric performance of double perovskite Eu2NiMnO6 (ENMO), Gd2NiMnO6 (GNMO), and Tb2NiMnO6 (TNMO) ceramic powder samples synthesized by solid-state method have been investigated. X-ray diffraction structural investigation reveal that all compounds crystallize in the monoclinic structure with a P21/n space group. A ferromagnetic to paramagnetic (FM-PM) second-order phase transition occurred in ENMO, GNMO, and TNMO at 143, 130, and 112 K, respectively. Maximum magnetic entropy changes and relative cooling power with a 5 T applied magnetic field are determined to be 3.2, 3.8, 3.5 J/kgK and 150, 182, 176 J/kg for the investigated samples, respectively. The change in structural, magnetic, and magnetocaloric effect attributed to the superexchange mechanism of Ni2+–O–Mn3+ and Ni2+–O–Mn4+. The various atomic sizes of Eu, Gd, and Tb affect the ratio of Mn4+/Mn3+, which is responsible for the considerable change in properties of double perovskite.

Electrochemical Performances of Yttrium Doped Li3V2–XYX(PO4)3/C Cathode Material for Lithium Secondary Battery

2015 ◽  
Vol 15 (10) ◽  
pp. 8042-8047 ◽  
Author(s):  
Minchan Jeong ◽  
Hyun-Soo Kim ◽  
Dong-Sik Bae ◽  
Chang-Woo Lee ◽  
Bong-Soo Jin
Keyword(s):  
Electrochemical Impedance ◽  
Rate Capability ◽  
Cycling Performance ◽  
Charge Transfer Resistance ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
Lithium Secondary Battery ◽  
Capacity Retention ◽  
Solid State Method ◽  
Transfer Resistance

In this study, the Li3V2–X YX(PO4)3 compounds have been synthesized by a simple solid state method. In addition, a polyurethane was added to apply carbon coating on the surface of the Li3V2–X YX(PO4)3 particles for enhancement of the electrical conductivity. The crystal structure and morphology of the synthesized Li3V2–XYX(PO4)3/C (LVYP/C) was investigated using an X-ray diffraction (XRD) and a scanning electron microscopy (SEM) systematically. The electrochemical performance of synthesized material, such as the initial capacity, rate capability, cycling performance and EIS was evaluated. The sizes of synthesized particle ranged from 1 to 5 μm. The Li3V2–XYX(PO4)3/C (X = 0.02) delivered the initial discharge capacity of 171.5 mAh · g–1 at 0.1C rate. It showed a capacity retention ratio of 73.0% at 1.0C after 100th cycle. The electrochemical impedance spectroscopies (EIS) results revealed that the charge transfer resistance of the material decreases by Y doping.

Synthesis, Rietveld refinement of crystal structure, electron diffraction, and electrical transport properties of Ba2(Ca1–x–yFexNby)(Nb1–zFez)O6–δ double perovskites

2011 ◽  
Vol 89 (6) ◽  
pp. 688-696 ◽  
Author(s):  
Wang Hay Kan ◽  
Trang T. Trinh ◽  
Tobias Fürstenhaupt ◽  
Venkataraman Thangadurai
Keyword(s):  
Crystal Structure ◽  
Electron Diffraction ◽  
Electrical Transport ◽  
Double Perovskite ◽  
Rietveld Analysis ◽  
X Ray Diffraction ◽  
Electrical Transport Properties ◽  
Solid State Method ◽  
Boundary Conductivity ◽  
Selected Area Electron Diffraction

We report the synthesis, crystal structure, and electrochemical properties of new Fe-doped Ba2(Ca1–x–yFexNby)(Nb1–zFez)O6–δ (Fe–BCN). The Fe–BCN was synthesized by a solid-state method in air using corresponding metal oxides and salts at elevated temperature. All of the observed powder X-ray diffraction (PXRD) peaks of the investigated Fe–BCN were indexed as cubic Fm-3m (space group No. 225) double perovskite-type structure with cell constants a ∼ 8.4 Å and is consistent with selected area electron diffraction (SAED). Rietveld analysis suggested the distribution of Fe was at both 4a and 4b sites, supported the proposed chemical formula Ba2(Ca1–x–yFexNby)(Nb1–zFez)O6–δ. This was further verified by bond valence sum (BVS) analysis of the cations. The Fe–BCN showed superior chemical stability in pure CO2 and boiling H2O confirmed by PXRD and FTIR. The electrical conductivity was determined by AC impedance spectroscopy. Among the samples investigated, Ba2(Ca0.79Fe0.21)(Nb0.71Fe0.29)O6–δ showed the highest total (bulk + grain-boundary) conductivity of 1.1 × 10−2 S cm–1 in humidified (3%) N2 at 600 °C with activation energy of 0.43 eV in the temperature range 200–800 °C.

scholarly journals Synthesis and Characterization of MnFe2O4 Nanoparticles and its Electrochemical Performance Evaluated as Anode for Li-ion Battery Applications

2019 ◽  
Vol 9 (2S2) ◽  
pp. 308-312
Keyword(s):  
Electrochemical Performance ◽  
Electrochemical Impedance ◽  
Impedance Analysis ◽  
Li Ion Battery ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Discharge Performance ◽  
Li Ion ◽  
Mnfe2o4 Nanoparticles ◽  
Charge Discharge

In the last decade, large number of research has been made to increase the capacity of anodes by changing the graphite with Si or Sn and conversion based materials such as MnFe2O4 , Co3O4 , Fe2O3 and NiO etc.,. In the present work, MnFe2O4 nanoparticles has synthesized by simple solid-state method. The crystal structure of MnFe2O4 evaluated by powder X-ray diffraction (XRD) and its morphology invetigated by Scanning Electron Microscopy (SEM), and its electrochemical performance has been carried out by Cyclic Voltammetry (CV), charge-discharge and electrochemical impedance analysis (EIS). The results of charge-discharge performance showed an excellent discharge capacity of 860 mA hg-1 when tested as anode for Li-ion battery applications.

scholarly journals Structural and Electrochemical Investigation of Li1.02Mn1.92Al0.02Fe0.02Cr0.02O4-xFx(x=0, 0.08) Synthesized by Solid-State Method

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Hai-Lang Zhang ◽  
Nanchun Xiang
Keyword(s):  
Solid State ◽  
Electrochemical Impedance ◽  
Retention Rate ◽  
Cycle Performance ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Lithium Secondary Batteries ◽  
Metal Element ◽  
State Method ◽  
Discharge Test

To improve the cycle performance of spinel LiMn2O4as the cathode of 4-V-class lithium secondary batteries, spinel phases Li1.02Mn1.92Al0.02Fe0.02Cr0.02O4-xFx(x=0, 0.08) have been successfully prepared by a conventional solid-state method. The structure and physicochemical properties of this as-prepared powder were investigated by powder X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge test in detail. The results reveal that the multiple doping spinel Li1.02Mn1.92Al0.02Fe0.02Cr0.02O4F0.08have better electrochemical performance than the undoped or only metal-element doped material, which may be contributed to the multiple cation and anion doping to lead to a more stable spinel framework with good capacity retention rate.

On the Properties of an Ion Conductive System Incorporated in Hybrid Films

2000 ◽  
Vol 628 ◽  
Author(s):  
G. González ◽  
P. J. Retuert ◽  
S. Fuentes
Keyword(s):  
Electrochemical Impedance ◽  
Ternary Phase Diagram ◽  
Lithium Perchlorate ◽  
Molar Ratio ◽  
Ionic Conductors ◽  
X Ray Diffraction ◽  
Poly Ethylene Oxide ◽  
Ion Conducting ◽  
Poly Ethylene ◽  
High Degree

ABSTRACTBlending the biopolymer chitosan (CHI) with poly (aminopropilsiloxane) oligomers (pAPS), and poly (ethylene oxide) (PEO) in the presence of lithium perchlorate lead to ion conducting products whose conductivity depends on the composition of the mixture. A ternary phase diagram for mixtures containing 0.2 M LiClO4 shows a zone in which the physical properties of the products - transparent, flexible, mechanically robust films - indicate a high degree of molecular compatibilization of the components. Comparison of these films with binary CHI-pAPS nanocomposites as well as the microscopic aspect, thermal behavior, and X-ray diffraction pattern of the product with the composition PEO/CHI/pAPS/LiClO4 1:0.5:0.6:0.2 molar ratio indicates that these films may be described as a layered nanocomposite. In this composite, lithium species coordinated by PEO and pAPS should be inserted into chitosan layers. Electrochemical impedance spectroscopy measurements indicate the films are pure ionic conductors with a maximal bulk conductivity of 1.7*10-5 Scm-1 at 40 °C and a sample-electrode interface capacitance of about 1.2*10-9 F.

Effect of Zn Content on Structure, Roughness and Corrosion Behavior of Zn-Ni Alloys

2019 ◽  
Vol 17 (17) ◽  
pp. 17-22
Author(s):  
Hayette Faid
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Stripping Voltammetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ni Alloys ◽  
Sulfate Bath ◽  
Zn Content ◽  
Polarization Test ◽  
Δ Phase

AbstractIn this work, Zn-Ni alloys have been deposited on steel from sulfate bath, by electrodeposition method. The effect of Zn content on deposits properties was studied by cyclic voltammetry (CV), chronoaperometry (CA), linear stripping voltammetry (ALSV) and diffraction (XRD) and scanning electronic microscopy (SEM). The corrosion behavior in 3.5 wt. NaCl solution was examined using anodic polarization test and electrochemical impedance spectroscopy. X-ray diffraction of show that Zn-Ni alloys structure is composed of δ phase and γ phase, which increase with the decrease of Zn content in deposits. Results show that deposits obtained from bath less Zn2+ concentration exhibited better corrosion resistance.

Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

2020 ◽  
Vol 38 (4A) ◽  
pp. 491-500
Author(s):  
Abeer F. Al-Attar ◽  
Saad B. H. Farid ◽  
Fadhil A. Hashim
Keyword(s):  
Ionic Conductivity ◽  
Electrochemical Impedance ◽  
Structural Information ◽  
Impedance Analysis ◽  
High Energy ◽  
Yttria Stabilized Zirconia ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Powder Morphology ◽  
X Ray

In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.

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