Electronic and ionic relaxations in oxide glasses

Murawski, L.; Barczyński, R.J.

doi:10.1016/j.ssi.2004.06.027

Cited by 64 publications

(48 citation statements)

References 24 publications

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“…The remarkable feature of all these iron phosphate glasses is that E a is about the same as in LiFePO 4 . For instance, E a =0.61 ±0.03 eV in binary iron phosphate xP 2 O 5 -(1−x)FeO, for any x in the range 40-55 mol% investigated [21]. The value E a =0.65±0.05 eV relevant to LiFePO 4 also applies to (50−x)FeO-50 P 2 O 5 -xBaO in the range of composition that has been explored (10≤x≤35 mol%) [20] and also where the modifier BaO is replaced by CaO or by Na 2 O [21].…”

Section: Electronic Propertiesmentioning

confidence: 95%

Small magnetic polaron effect in lithium iron phosphates

Mauger

Zaghib

Giligny

et al. 2007

Ionics

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International audienceThe small polarons in LiFePO4 are associated with the presence of Fe3+ ions introduced by the native defects in relative concentration [Fe3+]/[Fe2+ + Fe3+] 3 x 10(-3) in the samples known to be optimized with respect to their electrochemical properties. The nearest iron neighbours around the central polaron site are spin-polarized by the indirect exchange mediated by the electronic charge in excess. These small magnetic polarons are responsible for the interplay between electronic and magnetic properties that are quantitatively and self-consistently analysed. Comparison is made with other magnetic polaron effects in other members of the family of magnetic semiconductors to which this material belongs

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Section: Electronic Propertiesmentioning

confidence: 95%

Small magnetic polaron effect in lithium iron phosphates

Mauger

Zaghib

Giligny

et al. 2007

Ionics

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“…Similar behavior has been also observed for all the other compositions. This plateau is attributed to the long-range translational motion of ions contributing to dc conductivity dc [16]. At lower frequency the ac conductivity is approximately equal to the measured σ dc conductivity.…”

Section: Ac and DC Conductivity Measurementsmentioning

confidence: 74%

“…Figure 5(b) represents an increase in the dielectric constant (ε \ ) values with the increase of WO 3 content of the glass. This behavior explained as WO 3 content increase, a gradual conversion of W +5 to W + 6 ions in the glass network takes place [16] . W + 6 ions act as modifiers, weaken the glass network and ,thus create pathways suitable for migration of free ions that build up space charge.…”

Section: The Dielectric Constant ε \ and The Dielectric Loss Tan δmentioning

confidence: 90%

“…The conductivity of alkali metal containing glasses is ionic [8]. However in tungsten phosphate glasses the electronic conduction was attributed to hopping of electrons from the W +5 to W +6 ions [16]. Thus It can be assumed that with the addition of WO 3 up to 10 mol% a mixed ionic-electronic conduction mechanisms operation are simultaneously obtained, where formation of ion-polaron pair tend to decrease the conductivity and increase in the ΔE dc values in agreement with observed by [13].…”

Section: Ac and DC Conductivity Measurementsmentioning

confidence: 99%

“…It has also been reported that in some glasses containing both alkali metal cations and transition metal ions, electrical transport is mainly electronic since alkali metal cations have small mobility. [13,14,16]. The relation between the ac conductivity and the WO 3 concentration are represented in Fig.…”

Section: Ac and DC Conductivity Measurementsmentioning

confidence: 99%

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Dielectric properties and scaling behavior of lithium tungsten phosphate glasses

Shaaban

2012

J Electroceram

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In the present study a series of ternary (30 Li 2 O, (70-x) P 2 O 5 , xWO3) glasses were prepared and their dielectric properties and ac conductivity were investigated. The measurements have been taken in the frequency range from 100 Hz to 100 kHz and over the temperature range from 296 K to 578 K. The temperature dependence of ac conductivity can be adequately explained by considering the contributions from mixed ionic and electronic mechanisms. In the studied glasses it is found that the ac conductivity increases with increasing frequency. By investigating the relation between temperature and the frequency exponent "s" of the power law σ ac 0Aω s , it is found that the Correlated Barrier Hopping model (CBH) is appropriate for describing the conduction mechanism in the samples. In an attempt to investigate the universality of ac conductivity in these glasses, it is found that the data obtained follow Rolling scaling model. When considering the dielectric properties, it is found that the M″vs. M′ plots give master ColeCole curves at all temperatures. These results can be considered as an indication of the presence of space charge or accumulation of charges in some regions inside the samples. The relation between M″/ M max″ and f/f p represent a master plot at different temperatures. These scaling suggest the existence of a distribution of potential wells, in which the carriers are trapped.

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Interface‐Driven Thermoelectric Switching Performance of VO⁺‐Diffused Soda‐Lime Glass

Alphonse

Muralikrishna

Tyler

et al. 2021

Physica Rapid Research Ltrs

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Strongly confined NaVO+ segregation and its thermoresponsive functionality at the interface between simple sputter‐deposited amorphous vanadium oxide thin films and soda‐lime glass is substantiated in this work by in situ temperature‐controlled time‐of‐flight secondary‐ion mass spectrometry (ToF‐SIMS). The obtained ToF‐SIMS depth profiles provide unambiguous evidence for a reversible transformation that causes systematic switching of the NaVO+/Na+ and Na+/VO+ intensities upon cycling the temperature between 25 and 340 °C. Subsequently, NaVO complexes are found to be reversibly formed (at 300 °C) in vanadium oxide‐diffused glass, leading to thermoresponsive electrical behavior of the thin‐film glass system. This new segregation and diffusion‐dependent multifunctionality of NaVO+ point toward applications as an advanced material for thermoelectrical/optical switches, in smart windows or in thermal sensors.

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Electronic and ionic relaxations in oxide glasses

Cited by 64 publications

References 24 publications

Small magnetic polaron effect in lithium iron phosphates

Small magnetic polaron effect in lithium iron phosphates

Dielectric properties and scaling behavior of lithium tungsten phosphate glasses

Interface‐Driven Thermoelectric Switching Performance of VO⁺‐Diffused Soda‐Lime Glass

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Electronic and ionic relaxations in oxide glasses

Cited by 64 publications

References 24 publications

Small magnetic polaron effect in lithium iron phosphates

Small magnetic polaron effect in lithium iron phosphates

Dielectric properties and scaling behavior of lithium tungsten phosphate glasses

Interface‐Driven Thermoelectric Switching Performance of VO+‐Diffused Soda‐Lime Glass

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Interface‐Driven Thermoelectric Switching Performance of VO⁺‐Diffused Soda‐Lime Glass