Electronic conductivity in Na2O–FeO–P2O5 glasses

Murawski, L.; Barczyński, R.J.; Samatowicz, D.

doi:10.1016/s0167-2738(02)00224-2

Cited by 47 publications

(26 citation statements)

References 8 publications

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“…It is clear from this figure that all samples exhibit approximately gradual linear increase for the whole working frequency range. Nearly the same behavior is also observed for sodium phosphate glass [26].…”

Section: Frequency Dependences Dielectric Parameterssupporting

confidence: 79%

“…The dc part is independent of frequency and is dominant at lower frequencies and it appears as a flat dc plateau at the low frequency region. Such plateau can be considered as an indicative for the domination of dc conductivity and it is 30 IMPACT OF CuO CONTENT ON THE DIELECTRIC PROPERTIES … observed at high temperature but unobservable at room temperature [26]. On the other hand, the ac conductivity is approximately independent of frequency at low frequencies but it is frequency dependent at the high frequency region.…”

Section: Frequency Dependences Dielectric Parametersmentioning

confidence: 98%

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IMPACT OF CuO CONTENT ON THE DIELECTRIC PROPERTIES OF ZINC SODIUM PHOSPHATE GLASSES CONTAINING Al2O3

Elshaikh

Elbashar

Ibrahimand

et al. 2017

Al-Azhar Bulletin of Science

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Section: Frequency Dependences Dielectric Parameterssupporting

confidence: 79%

Section: Frequency Dependences Dielectric Parametersmentioning

confidence: 98%

IMPACT OF CuO CONTENT ON THE DIELECTRIC PROPERTIES OF ZINC SODIUM PHOSPHATE GLASSES CONTAINING Al2O3

Elshaikh

Elbashar

Ibrahimand

et al. 2017

Al-Azhar Bulletin of Science

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“…In this hopping process, in which the hole is in a bound polaron state with the same energy after and before the hop, the activation energy is simply the energy barrier that the hole has to overcome to jump to the next site. This is much less than the binding energy required to send a d-electron from an Fe 2+ valence band to the conduction band, an energy of 0.65 eV that is typical of the hopping process in iron systems [10,11]. Nevertheless, this activation energy is still too large, and thus the electronic mobility is too small, to envision the use of LiFePO 4 as a cathode for Li-ion batteries with bare particles.…”

Section: Introductionmentioning

confidence: 99%

Overview of olivines in lithium batteries for green transportation and energy storage

Zaghib

Mauger

Julien

2012

J Solid State Electrochem

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We present the progress on the physical chemistry of the olivine compounds since the pioneering work of Prof. John Goodenough. This progress has allowed LiFePO 4 to become the active cathode element of a new generation of Li-ion batteries that makes a breakthrough in the technology of the energy storage and electric transportation. This achievement is the fruit of about a decade of intensive research in the electrochemical community during which chemists, electrochemists, and physicists added there efforts to understand the properties of the material, to overcome the obstacles that were met on the way, and finally to reach the state of the art that allows its commercial use for worldwide applications in the industry today. These obstacles involved carbon coating, purification, control of the surface, the progressive decrease of the size of the particles down to nanoscale, and comprehensive investigation of surface effects. Nevertheless, heterogeneity in the quality of the product available on the market is damaging and may even be an obstacle to the development of new demanding technologies such as electric transportation. Emphasis is placed on the quality control that is needed to guarantee the reliability and the optimum electrochemical performance of this material as the active cathode element of Li-ion batteries. The route to increase the performance of Li-ion batteries with the other members of the family is also discussed. Since Prof. John Goodenough not only initiated the work but also played a major role in the research and development on these materials through the years, the present review is dedicated to him.

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“…These results suggest that with increasing content of Cr 2 O 3 above 0.05 mol% in the glass network, there will be an increase in the concentration of free charge carriers that build up space charge polarization [13][14][15][16][17][18][19].…”

Section: +mentioning

confidence: 90%

Influence of chromium ions on dielectric and spectroscopic properties of Na₂O-PbO-B₂O₃glass system

Brahmaiah¹,

Krishna²,

Kondaiah³

et al. 2009

IOP Conf. Ser.: Mater. Sci. Eng.

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Na 2 O-PbO-B 2 O 3 glasses doped with Cr 2 O 3 by varying its concentration relative to borate (in the range of 0 to 0.2 mol% in steps of 0.05 mol %) are prepared. Dielectric studies ( dielectric constant , loss tan , conductivity ac etc in the frequency range 10 3 to 10 6 Hz and in the temperature range 30 to 250 o C) and spectroscopic properties like IR & ESR etc. were carried out on these samples. From these studies it was noticed that chromium with Cr 6+ ions exist in network forming positions at low concentration i.e., at 0.05 mol% beyond which Cr 6+ ions gradually get converted into Cr 3+ ions, there by act as network modifiers and decrease the rigidity of the glass network. IntroductionAlkali oxy borate glasses have variety of applications in phosphors, solar energy converters and in a number of electronic devices. These glasses are relatively moisture resistant. They possess high electrical insulating and mechanical strength when compared to pure borate glasses. Alkali oxy borate glasses are transparent from near UV to the middle infrared region. Addition of alkaline earth oxides like CaO, BaO, MgO, PbO etc., in to these glass matrices is expected to increase their resistance against moisture. Now-a-days, much attention has been paid to research in inorganic glasses doped with transition metal ions, because of their technological importance in the development of tunable solid state lasers, new luminescence materials, solar energy converters and fiber optic communication devices [1][2][3][4]. Among various transition metal ions, chromium ions have strong bearing on optical, magnetic and electrical properties of glasses. The present investigation is under taken to probe the local environment of chromium ion in Na 2 O-PbO-B 2 O 3 glass matrix and its impact on dielectric properties.

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Electronic conductivity in Na2O–FeO–P2O5 glasses

Cited by 47 publications

References 8 publications

IMPACT OF CuO CONTENT ON THE DIELECTRIC PROPERTIES OF ZINC SODIUM PHOSPHATE GLASSES CONTAINING Al2O3

IMPACT OF CuO CONTENT ON THE DIELECTRIC PROPERTIES OF ZINC SODIUM PHOSPHATE GLASSES CONTAINING Al2O3

Overview of olivines in lithium batteries for green transportation and energy storage

Influence of chromium ions on dielectric and spectroscopic properties of Na₂O-PbO-B₂O₃glass system

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Electronic conductivity in Na2O–FeO–P2O5 glasses

Cited by 47 publications

References 8 publications

IMPACT OF CuO CONTENT ON THE DIELECTRIC PROPERTIES OF ZINC SODIUM PHOSPHATE GLASSES CONTAINING Al2O3

IMPACT OF CuO CONTENT ON THE DIELECTRIC PROPERTIES OF ZINC SODIUM PHOSPHATE GLASSES CONTAINING Al2O3

Overview of olivines in lithium batteries for green transportation and energy storage

Influence of chromium ions on dielectric and spectroscopic properties of Na2O-PbO-B2O3glass system

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Product

Resources

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Influence of chromium ions on dielectric and spectroscopic properties of Na₂O-PbO-B₂O₃glass system