Synthesis and Electrical Properties of SmBi5Fe2Ti3O18

1998 ◽  
Vol 12 (10) ◽  
pp. 371-381 ◽  
Author(s):  
N. V. Prasad ◽  
G. Prasad ◽  
T. Bhimasankaram ◽  
S. V. Suryanarayana ◽  
G. S. Kumar
Keyword(s):  
Activation Energy ◽  
Solid State ◽  
Electrical Properties ◽  
Grain Boundary ◽  
Electrical Impedance ◽  
Complex Impedance ◽  
Dc Conductivity ◽  
Frequency Range ◽  
Oxide Compound ◽  
Sintering Method

SmBi 5 Fe 2 Ti 3 O 18, a five layered bismuth oxide compound is synthesized using a solid-state double sintering method. DC conductivity, impedance, and AC conductivity are studied in the temperature range 30–500°C and frequency range 1 kHz–1 MHz. Complex impedance plots are used to separate grain and grain boundary contributions to electrical impedance. Activation energy for DC conductivity was found to be around 1.0 eV. The results are analyzed to understand the conductivity mechanism.

scholarly journals Immittance Studies of Bi6Fe2Ti3O18 Ceramics

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5286 ◽  
Author(s):  
Agata Lisińska-Czekaj ◽  
Dionizy Czekaj ◽  
Barbara Garbarz-Glos ◽  
Wojciech Bąk
Keyword(s):  
Activation Energy ◽  
Electric Modulus ◽  
Complex Impedance ◽  
Dc Conductivity ◽  
Modulus Function ◽  
Conductivity Relaxation ◽  
Frequency Range ◽  
A Value ◽  
Polycrystalline Ceramics ◽  
Electric Behavior

Results of studies focusing on the electric behavior of Bi6Fe2Ti3O18 (BFTO) ceramics are reported. BFTO ceramics were fabricated by solid state reaction methods. The simple oxides Bi2O3, TiO2, and Fe2O3 were used as starting materials. Immittance spectroscopy was chosen as a method to characterize electric and dielectric properties of polycrystalline ceramics. The experimental data were measured in the frequency range Δν = (10−1–107) Hz and the temperature range ΔT = (−120–200) °C. Analysis of immittance data was performed in terms of complex impedance, electric modulus function, and conductivity. The activation energy corresponding to a non-Debye type of relaxation was found to be EA = 0.573 eV, whereas the activation energy of conductivity relaxation frequency was found to be EA = 0.570 eV. An assumption of a hopping conductivity mechanism for BFTO ceramics was studied by ‘universal’ Jonscher’s law. A value of the exponents was found to be within the “Jonscher’s range” (0.54 ≤ n ≤ 0.72). The dc-conductivity was extracted from the measurements. Activation energy for dc-conductivity was calculated to be EDC = 0.78 eV, whereas the dc hopping activation energy was found to be EH = 0.63 eV. The obtained results were discussed in terms of the jump relaxation model.

High Tc Oxide Solid State Reaction Kinetics Via Complex Impedance Spectroscopy

1989 ◽  
Vol 169 ◽  
Author(s):  
E. A. Cooper ◽  
T. O. Mason ◽  
U. Balachandran ◽  
M. L. Kullberg
Keyword(s):  
Activation Energy ◽  
Particle Size ◽  
Solid State ◽  
Solid State Reaction ◽  
Complex Impedance ◽  
Particle Size Effect ◽  
Large Temperature ◽  
Impedance Spectra ◽  
High Tc ◽  
Solid State Reaction Kinetics

AbstractImpedance spectra (5Hz ‐ 13MHz) were collected during the solid state reaction of Yba2Cu2O6+y from large monosized CuO particles imbedded in a finely divided Y2 O3 /BaCO3 matrix. No particle size effect was observed, but a large temperature effect was observed corresponding to an activation energy of approximately 1.8eV (175kJ/mol) over the range 700‐900°C.

scholarly journals Synthesis and Characterisation of Structural and Electrical Properties of CuMn2O4 Spinel Compound

2021 ◽  
pp. 1-4
Author(s):  
Rasha Yousef ◽  
Alaa Nassif ◽  
Abla Al-Zoubi ◽  
Nasser Al-Din
Keyword(s):  
Activation Energy ◽  
Solid State ◽  
Electrical Properties ◽  
Optimum Temperature ◽  
Prepared Compound ◽  
Solid State Method ◽  
Structural And Electrical Properties ◽  
Cubic Structure ◽  
Experimental Density ◽  
Scherrer Method

CuMn2O4 was synthesized by the solid-state method. MnO2 and CuO were used as precursors. The optimum temperature of synthesis was 850°C. XRD results showed that the prepared compound had a cubic structure with Fd3 ̅m space group. The lattice constant and unit cell volume were a=8.359Å and V=584.14A°3 respectively. The grain size was calculated by the Debye-Scherrer method and was 33.49 nm for CuMn2O4 annealed at 850°C. The experimental density was calculated and compared to the theoretical density. The results were ρt= 5.399 gr/cm3 and ρE = 5.24 gr/cm3. The electrical properties of the compound showed that it behaves like a semiconductor, and the activation energy of the compound was 0.1535 eV. KEYWORDS Activation energy, copper manganite (CuMO), mixed oxide, solid-state reaction, spinel

Method of High Active Preparation and Electrical Properties of CuFeO2 Delafossite-Type

2014 ◽  
Vol 979 ◽  
pp. 302-306 ◽  
Author(s):  
Chalermpol Rudradawong ◽  
Aree Wichainchai ◽  
Aparporn Sakulkalavek ◽  
Yuttana Hongaromkid ◽  
Chesta Ruttanapun
Keyword(s):  
Crystal Structure ◽  
Electrical Conductivity ◽  
Solid State ◽  
Electrical Properties ◽  
Grain Boundary ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Lattice Parameter ◽  
Metal Powders ◽  
High Power Factor

In this paper, the CuFeO2compound were prepared by classical solid state reaction (CSSR) and direct powder dissolved solution (DPDS) method from starting material metal oxides and metal powders. Preparation of two methods shows that, direct powder dissolved solution faster recover phases than classical solid state reaction method. The fastest method gets from starting materials Cu and Fe metal powders, the electrical conductivity, Seebeck coefficient, carrier concentration and mobility are 10.68 S/cm, 244.59 μV/K, 12.86×1016cm-3and 494.96 cm2/V.s, respectively. In addition, each CuFeO2compounds were investigated on crystal structure and electrical properties. From XRD and SEM results, all samples have a crystal structure delafossite-typeand a large grain boundary more than 15 μm by electrical conductivity corresponds to grain boundary and lattice parameter: a increases. Within this paper, from above results exhibit that preparation CuFeO2from Cu and Fe by direct powder dissolved solution method most appropriate for thermoelectric oxide materials due to high active for preparation else high lattice strain and high power factor are 0.00052 and 0.64×10-4W/mK2, respectively.

IMPEDANCE CHARACTERISTICS OF La3/2Bi3/2Fe5O12 CERAMICS

2009 ◽  
Vol 23 (26) ◽  
pp. 5179-5189
Author(s):  
K. JAWAHAR ◽  
BANARJI BEHERA ◽  
R. N. P. CHOUDHARY
Keyword(s):  
Activation Energy ◽  
High Temperature ◽  
Solid State ◽  
Room Temperature ◽  
Complex Impedance ◽  
Conductivity Spectrum ◽  
High Temperature Region ◽  
Solid State Reaction Technique ◽  
Impedance Characteristics ◽  
Universal Power Law

Polycrystalline La 3/2 Bi 3/2 Fe 5 O 12 (LBIO) compound was prepared by a high-temperature solid-state reaction technique. The complex impedance of LBIO was measured over a wide temperature (i.e., room temperature to 500°C) and frequencies (i.e., 102–106 Hz) ranges. This study takes advantage of plotting ac data simultaneously in the form of impedance and modulus spectroscopic plots and obey non-Debye type of relaxation process. The Nyquist's plot showed the presence of grain effects in the material at high temperature. The ac conductivity spectrum was found to obey Jonscher's universal power law. The dc conductivity was found to increase with rise in temperature. The activation energy of the compound was found to be 0.24 and 0.51 eV in the low and high-temperature region, respectively, for conduction process.

Microstructure, electrical properties and temperature stability in Bi0.5Na0.5Zr0.95Ce0.05O3 modified R–T phase boundary of potassium-sodium niobium lead-free ceramics

RSC Advances ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 6983-6989 ◽  
Author(s):  
Zhi Tan ◽  
Jie Xing ◽  
Laiming Jiang ◽  
Lingguang Sun ◽  
Jiagang Wu ◽  
...  
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Phase Boundary ◽  
Temperature Stability ◽  
Lead Free ◽  
Lead Free Ceramics ◽  
Solid State Sintering ◽  
T Phase ◽  
Sintering Method ◽  
Doping Ratio

(1 − x)K0.48Na0.52Nb0.95Sb0.05O3–xBi0.5Na0.5Zr0.95Ce0.05O3 [(1 − x)KNNS–xBNZC] lead-free piezoelectric ceramics, with doping ratio of x ranging from 0 to 0.05, were synthesized by the conventional solid state sintering method.

Cobalt oxide addition effects on the microstructure and electronic properties of CuZn ferrites

2015 ◽  
Vol 2015 (CICMT) ◽  
pp. 000131-000138
Author(s):  
Hsing-I Hsiang ◽  
Jui-Huan Tu ◽  
Wen-Chin Kuo ◽  
Chi-Yao Tsai ◽  
Li-Then Mei
Keyword(s):  
Dielectric Properties ◽  
Solid State ◽  
Electrical Properties ◽  
Grain Boundary ◽  
Cobalt Oxide ◽  
Solid State Reaction ◽  
Copper Ions ◽  
Oxide Addition ◽  
Second Phases ◽  
Space Polarization

The effects of cobalt oxide addition on the microstructure and electrical properties of CuZn ferrites were investigated. CuZn ferrites with compositions of (CuO)0.2(ZnO)0.8(Co3O4)x/3 (Fe2O3) 0.986-2x; x = 0 , 0.02, 0.04, 0.08, 0.1 were synthesized using a solid state reaction. It was observed that the addition of cobalt will change the amounts and distribution of Cu2+, Cu+, Fe2+, and Fe3+ in the grain and grain boundary. The segregation of copper ions at the grain boundary was observed as the substitution of cobalt was increased. Moreover, as the x value was increased above 0.04, second phases of CuO and ZnO were found. The different amounts and distribution of Cu2+, Cu+, Fe2+, and Fe3+ in the bulk and grain boundary for samples added with different amounts of cobalt changed the conductivity activation energies of the bulk and grain boundary, and hence affected the space polarization and dielectric properties.

scholarly journals Experimental Study of Electrical Properties of Pharmaceutical Materials by Electrical Impedance Spectroscopy

2020 ◽  
Vol 10 (18) ◽  
pp. 6576
Author(s):  
Manuel Vázquez-Nambo ◽  
José-Antonio Gutiérrez-Gnecchi ◽  
Enrique Reyes-Archundia ◽  
Wuqiang Yang ◽  
Marco-A. Rodriguez-Frias ◽  
...  
Keyword(s):  
System Identification ◽  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Electrical Impedance ◽  
Wide Frequency Range ◽  
Electrical Impedance Spectroscopy ◽  
Frequency Range ◽  
Pharmaceutical Materials ◽  
Identification Techniques

The physicochemical characterization of pharmaceutical materials is essential for drug discovery, development and evaluation, and for understanding and predicting their interaction with physiological systems. Amongst many measurement techniques for spectroscopic characterization of pharmaceutical materials, Electrical Impedance Spectroscopy (EIS) is powerful as it can be used to model the electrical properties of pure substances and compounds in correlation with specific chemical composition. In particular, the accurate measurement of specific properties of drugs is important for evaluating physiological interaction. The electrochemical modelling of compounds is usually carried out using spectral impedance data over a wide frequency range, to fit a predetermined model of an equivalent electrochemical cell. This paper presents experimental results by EIS analysis of four drug formulations (trimethoprim/sulfamethoxazole C14H18N4O3-C10H11N3O3, ambroxol C13H18Br2N2O.HCl, metamizole sodium C13H16N3NaO4S, and ranitidine C13H22N4O3S.HCl). A wide frequency range from 20 Hz to 30 MHz is used to evaluate system identification techniques using EIS data and to obtain process models. The results suggest that arrays of linear R-C models derived using system identification techniques in the frequency domain can be used to identify different compounds.

SYNTHESIS, CHARACTERIZATION AND ELECTRICAL PROPERTIES OF Nd/Zr CO-DOPED NANO BaTiO3 CERAMICS

2012 ◽  
Vol 02 (01) ◽  
pp. 1250001 ◽  
Author(s):  
CH. SAMEERA DEVI ◽  
M. B. SURESH ◽  
G. S. KUMAR ◽  
G. PRASAD
Keyword(s):  
Electrical Properties ◽  
Grain Boundary ◽  
Sol Gel ◽  
Relaxation Times ◽  
Dc Conductivity ◽  
Present System ◽  
Bulk Resistance ◽  
Dc Conductivities ◽  
Boundary Relaxation ◽  
Gel Technique

Ceramic samples of composition Ba 1-3x Nd 2x Ti 1-y Zr y O 3 (x = 0.025;y = 0,0.025 and 0.05) were synthesized by modified sol–gel technique. Phase confirmation, surface morphology and electrical properties of the samples were studied using XRD, FESEM, impedance spectroscopy and DC conductivity. Impedance, AC and DC conductivities of the samples were recorded in the temperature range room temperature (RT) –500°C. From impedance data, various parameters like bulk resistance (R b ), bulk capacitance (C b ), grain resistance (R g ), grain boundary resistance (R gb ), grain capacitance (C g ) and grain boundary capacitance (C gb ) were determined. These parameters were found to be function of both temperature and frequency. Grain and grain boundary relaxation times (τg,τgb) were also evaluated as a function of temperature. From AC and DC conductivity plots activation energies for conduction were obtained. Results obtained lead to improved understanding of conductivity and charge transportation kinetics in the present system of samples.

Dielectric relaxation behavior in co-precipitation derived ferrite (Zn1−xNix)Fe2O4 (0.2 ≤ x ≤ 0.5) ceramics

2016 ◽  
Vol 30 (02) ◽  
pp. 1550277 ◽  
Author(s):  
Y. P. Jiang ◽  
R. Li ◽  
X. G. Tang ◽  
Q. X. Liu ◽  
D. G. Chen
Keyword(s):  
Activation Energy ◽  
Electrical Properties ◽  
Dielectric Relaxation ◽  
Arrhenius Equation ◽  
Complex Impedance ◽  
Impedance Spectra ◽  
Nickel Doping ◽  
Dielectric Relaxation Behavior ◽  
Co Precipitation ◽  
Complex Impedance Spectra

The influence of nickel doping on the electrical properties and dielectric relaxation in Zn[Formula: see text]Ni[Formula: see text]Fe2O4 (ZNFO, [Formula: see text]) ceramics has been investigated via the dielectric and complex impedance spectra measurements. According to the modified Curie–Weiss law, the diffusivity factor of the ZNFO ceramics from 1.69 to 2.02 with [Formula: see text] increasing from 0.2 to 0.5, respectively. Two relaxation peaks are observed in the nickel doped samples, by employing the modified Arrhenius equation, two activation energy values of different sintering temperatures were calculated and analyzed in combination with oxygen vacancy. The Cole–Cole plots showed that the semicircular arcs which are nonideal Debye type, and the grain boundaries resistance increases with increasing Ni concentration.

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