Electrical Conductivity and Structural Studies on the Binary System BiI3-Ag2SO4

2012 ◽  
Vol 584 ◽  
pp. 521-525
Author(s):  
S. Austin Suthanthiraraj ◽  
Ayesha Saleem
Keyword(s):  
Electrical Conductivity ◽  
Binary System ◽  
Ionic Conduction ◽  
Structural Characteristics ◽  
Complex Impedance ◽  
Present System ◽  
Rapid Melt Quenching ◽  
Ionic Nature ◽  
Electrochemical Devices ◽  
Silver Sulphate

A new solid-state pseudo binary system BiI3_-Ag2SO4 involving bismuth triiodide (BiI3) and a silver oxysalt namely silver sulphate (Ag2SO4) has been prepared using rapid melt-quenching technique. AC conductivity studies have been carried out on the nine different samples of the (BiI3)x –- (Ag2SO4)(1-x) system with compositions corresponding to x=0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8 and 0.9 mole fraction at temperatures ranging from room temperature (298 K) to 433K. The bulk resistance values estimated using complex impedance plots indicated that electrical conductivity of the synthesized solid specimens would vary from 2.9 x10-2 to 3.4 x10-6Scm-1 thus suggesting the present system to be ionic in nature. The extent of ionic conduction due to Ag + cation has also been analyzed using Wagner’s dc polarization technique whereas detailed structural characteristics of the various compositions derived from Fourier transform infrared (FTIR) spectroscopy and features of surface morphology of these samples obtained using scanning electron microscopy (SEM) have further supported the ionic nature of the chosen system and suggested possible application as a solid electrolyte in electrochemical devices.

scholarly journals Fast Diffusion of Iron in Single Crystal Rutile and Iron Doped Rutile

1983 ◽  
Vol 24 ◽  
Author(s):  
J. Sasaki ◽  
N. L. Peterson ◽  
L. C. De Jonghe
Keyword(s):  
Electrical Conductivity ◽  
Ionic Conductivity ◽  
Pressure Dependence ◽  
Ionic Conduction ◽  
Complex Impedance ◽  
Fast Diffusion ◽  
Iron Ions ◽  
Impedance Measurements ◽  
Fe Content ◽  
Shear Structure

ABSTRACTTracer diffusion coefficients of Fe, DFe* in single crystals of rutile and of 0 –2.0% Fe doped rutile were measured. The oxygen pressure dependence of DFe* in pure rutile showed complicated behavior. The values of DFe* may consist of contributions from Fe2+ ions diffusing by an interstitial mechanism and from Fe3+ ions diffusing by an interstitialcy mechanism in cooperation with tetravalent titanium interstitial ions, Tii. The value of DFe* in Fe doped rutile attains a saturation value when the Fe content reaches about 0.1%, D*Fe decreases drastically when the Fe content exceeds about 0.35%. Complex impedance measurements of electrical conductivity indicate the existence of ionic conduction for Fe doped rutile containing less than 0.35% of Fe. The small ionic conductivity relative to the values of D*Fe suggests that only a small fraction of the iron ions are highly mobile. Above 0.35% Fe, the observed drastic decrease in D*Fe may result from the formation of a shear structure In highly doped rutile.

scholarly journals Effect of chemical composition on the electrical conductivity of gneiss at high temperatures and pressures

Solid Earth ◽  
2018 ◽  
Vol 9 (2) ◽  
pp. 233-245 ◽  
Author(s):  
Lidong Dai ◽  
Wenqing Sun ◽  
Heping Li ◽  
Haiying Hu ◽  
Lei Wu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Temperature Region ◽  
Ionic Conduction ◽  
Complex Impedance ◽  
Weight Percent ◽  
Spectroscopic Technique ◽  
Ultrahigh Pressure ◽  
Chemical Compositions ◽  
Metamorphic Belt ◽  
Lower Temperature

Abstract. The electrical conductivity of gneiss samples with different chemical compositions (WA = Na2O + K2O + CaO  =  7.12, 7.27 and 7.64 % weight percent) was measured using a complex impedance spectroscopic technique at 623–1073 K and 1.5 GPa and a frequency range of 10−1 to 106 Hz. Simultaneously, a pressure effect on the electrical conductivity was also determined for the WA = 7.12 % gneiss. The results indicated that the gneiss conductivities markedly increase with total alkali and calcium ion content. The sample conductivity and temperature conform to an Arrhenius relationship within a certain temperature range. The influence of pressure on gneiss conductivity is weaker than temperature, although conductivity still increases with pressure. According to various ranges of activation enthalpy (0.35–0.52 and 0.76–0.87 eV) at 1.5 GPa, two main conduction mechanisms are suggested that dominate the electrical conductivity of gneiss: impurity conduction in the lower-temperature region and ionic conduction (charge carriers are K+, Na+ and Ca2+) in the higher-temperature region. The electrical conductivity of gneiss with various chemical compositions cannot be used to interpret the high conductivity anomalies in the Dabie–Sulu ultrahigh-pressure metamorphic belt. However, the conductivity–depth profiles for gneiss may provide an important constraint on the interpretation of field magnetotelluric conductivity results in the regional metamorphic belt.

Effect of MCl (M = Na, K) addition on microstructure and electrical conductivity of forsterite

2020 ◽  
Vol 92 (1) ◽  
pp. 10901
Author(s):  
Saloua El Asri ◽  
Hamid Ahamdane ◽  
Lahoucine Hajji ◽  
Mohamed El Hadri ◽  
Moulay Ahmed El Idrissi Raghni ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Single Phase ◽  
Sol Gel ◽  
Complex Impedance ◽  
Transmission Spectra ◽  
Electrical Measurements ◽  
Cation Type ◽  
Edx Analyses ◽  
The Fourier Transform

Forsterite single phase powder Mg2SiO4 was synthesized by sol–gel method alongside with heat treatment, using two different cation alkaline salts MCl as mineralizers (M = Na, K) with various mass percentages (2.5, 5, 7.5, and 10 wt.%). In this work, we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2SiO4. The formation of forsterite started at 680–740  °C and at 630–700  °C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) transmission spectra indicated bands corresponding to vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities, which were measured by Archimedes method, increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy. The results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.

Viscosity, electrical conductivity and density of the system ammonium nitrate-dimethyl sulphoxide

1984 ◽  
Vol 49 (5) ◽  
pp. 1109-1115
Author(s):  
Jindřich Novák ◽  
Zdeněk Kodejš ◽  
Ivo Sláma
Keyword(s):  
Electrical Conductivity ◽  
Aqueous Solutions ◽  
Ammonium Nitrate ◽  
Transport Properties ◽  
Calcium Nitrate ◽  
Dimethyl Sulphoxide ◽  
Present System ◽  
Empirical Equations ◽  
Concentrated Solutions ◽  
Nitrate Solutions

The density, viscosity, and electrical conductivity of highly concentrated solutions of ammonium nitrate in dimethyl sulphoxide have been determined over the temperature range 10-60 °C and the concentration range 7-50 mol% of the salt. The variations in the quantities as a function of temperature and concentration have been correlated by empirical equations. A comparison is made between the transport properties for the present system, aqueous solutions of ammonium nitrate, and calcium nitrate solutions in dimethyl sulphoxide.

Complex impedance and ionic conduction of single-crystalline BaTiO3

2016 ◽  
Vol 504 (1) ◽  
pp. 64-71 ◽  
Author(s):  
Keiji Shiga ◽  
Hirokazu Katsui ◽  
Takashi Goto
Keyword(s):  
Ionic Conduction ◽  
Complex Impedance ◽  
Single Crystalline

Mixed Ionic-Electronic Conduction in Pyrochlore Oxides

1990 ◽  
Vol 210 ◽  
Author(s):  
M. Spears ◽  
S. Kramer ◽  
P.K. Moon ◽  
H.L. Tuller
Keyword(s):  
Electronic Transport ◽  
Ionic Conduction ◽  
Structural Disorder ◽  
Electronic Conduction ◽  
Transport Parameters ◽  
Oxygen Ion Conductivity ◽  
Chemical Models ◽  
Oxygen Ion ◽  
Electrochemical Devices ◽  
Low X

AbstractThe transport properties of the pyrochlore solid solution Gd2(ZrxTil-x)2O7 are investigated to clarify the relationships between composition, structural disorder and ionic and electronic transport. The oxygen ion conductivity has been found to increase sharply with increasing Zr content, x, due to enhanced structural disorder, leading to intrinsic ionic conduction at large values ofx. In contrast, the n—type conductivity predominant at low x, decreases sharply above x=0.2. Defect chemical models are presented to account for the simultaneous contributions of both intrinsic and dopant induced disorder. These models are applied to the σ(T, PO2, dopant) data to extract key thermodynamic and transport parameters. The significance of these parameters and the potential application of these materials in electrochemical devices are discussed.

Dielectric, complex impedance and electrical conductivity studies of the multiferroic Sr2FeSi2O7-crystallized glass-ceramics

2016 ◽  
Vol 672 ◽  
pp. 64-71 ◽  
Author(s):  
Yongping Pu ◽  
Zijing Dong ◽  
Panpan Zhang ◽  
Yurong Wu ◽  
Jiaojiao Zhao ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Complex Impedance ◽  
Glass Ceramics

Dehydration and decomposition of pyrophyllite at high pressures: electrical conductivity and X-ray diffraction studies to 5 GPa

1997 ◽  
Vol 34 (6) ◽  
pp. 875-882 ◽  
Author(s):  
Tara L. Hicks ◽  
Richard A. Secco
Keyword(s):  
Electrical Conductivity ◽  
South African ◽  
Pressure Dependence ◽  
High Pressures ◽  
Ionic Conduction ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Dependence Of Conductivity

The dehydration and decomposition of South African pyrophyllite were studied in the pressure range 2.5–5.0 GPa and in the temperature (T) range 295–1473 K using both in situ electrical conductivity measurements and X-ray diffraction studies on the recovered samples. Activation energies for conduction (Qc) vary in the range 0.02–0.07 eV for T ≤ 500 K where the dominant conduction mode is electronic, and Qc is in the range 1.10–1.28 eV for T ≥ 500 K where ionic conduction dominates. Abrupt changes in the isobaric temperature dependence of conductivity mark the onset of dehydration and subsequent decomposition into kyanite plus quartz–coesite. At 2.5 GPa, South African pyrophyllite forms the dehydroxylate phase at 760 K with a pressure dependence of ~30 K/GPa and complete decomposition follows at 1080 K with a pressure dependence of ~41 K/GPa. The resulting pressure–temperature phase diagram is in very good agreement with many previous studies at 1 atm (101.325 kPa).

Phase diagram and electrical conductivity of the CeBr3–RbBr binary system

2008 ◽  
Vol 450 (1-2) ◽  
pp. 175-180 ◽  
Author(s):  
L. Rycerz ◽  
E. Ingier-Stocka ◽  
S. Gadzuric ◽  
M. Gaune-Escard
Keyword(s):  
Phase Diagram ◽  
Electrical Conductivity ◽  
Binary System

scholarly journals Az indikátoralapú teljesítményértékelésre épülő forráselosztás hatékonysága Magyarországon a felnőtteket ellátó háziorvosi praxisokban

2019 ◽  
Vol 160 (39) ◽  
pp. 1542-1553
Author(s):  
Anita Pálinkás ◽  
Nóra Kovács ◽  
Valéria Sipos ◽  
Ferenc Vincze ◽  
Magor Papp ◽  
...  
Keyword(s):  
Primary Care ◽  
Health Insurance ◽  
Performance Monitoring ◽  
Pay For Performance ◽  
Structural Characteristics ◽  
Statistical Testing ◽  
Present System ◽  
Medical Practices ◽  
Adjusted Indicators ◽  
Better Than

Abstract: Introduction: The indicator-based performance monitoring and pay-for-performance system for Hungarian primary care was established in 2009, covering the whole country. It is based on a stable legal system and well operating information technology. Although, the health insurance system is able to facilitate the performance improvement only by the financing for general medical practices, the many times modified present system does not take into consideration (apart from the geographical location of practices) factors which determine the performance but cannot be influenced by general practitioners. Aim: The study aimed at renewing the indicator set and evaluation methodology in order to enable the monitoring to evaluate the performance of general medical practices independent of their structural characteristics. Method: Each adult care specific primary care performance indicator from June 2016 covering the whole country has been investigated. Indicators adjusted for structural practice characteristics (age and gender of patients; relative education of people provided; settlement type and county of the practice) have been computed. The difference between adjusted indicators and national reference values has been evaluated by statistical testing. Appropriateness of the present monitoring and financing system has been investigated by comparing the practice level presently applied and adjusted indicators to outline the opportunities to develop the present system. Results: The present monitoring allocates 34.46% of pay-for-performance resources for improving the performance of practices. The majority of resources supports the conservation of performance. Furthermore, the present system is not able to identify each practice with better than reference performance, withholding amount corresponding to 8.83% of pay-for-performance resources. If this financing were restricted to practices with significantly better than reference performance, the maximum of the financing a month in a practice would increase from 176 042 HUF (551 EURO) to 406 604 HUF (1274 EURO). Conclusion: Completing the performance monitoring system operated at present by the National Health Insurance Fund of Hungary with indicators adjusted for structural characteristics of the general medical practices, the resource allocation effectiveness could be improved. Orv Hetil. 2019; 160(39): 1542–1553.

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