Properties of mixed Li2O and Na2O molybdenum phosphate glasses

Abbas, L.; Bih, L.; Nadiri, A.; Amraoui, Y. El; Mezzane, D.; Elouadi, Brahim

doi:10.1016/j.molstruc.2007.06.018

Cited by 40 publications

(21 citation statements)

References 26 publications

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“…Moreover, glasses containing molybdenum ions have interesting optical and electrical properties depending on the type and composition of glass and the different valence states of molybdenum ions [3]. Such peculiar properties are related to the ability of molybdenum ions to exist in glasses in four possible valences, namely Mo 3 þ , Mo 4 þ , Mo 5 þ and Mo 6 þ [4][5][6]. The conductivity process in transition metal ion glasses, such as Mo, V, etc.…”

Section: Introductionmentioning

confidence: 99%

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Physical properties and electrochemical performance of molybdenum–lead-germanate glasses and glass ceramics

Rada¹,

Culea²,

Chelcea³

et al. 2013

Ceramics International

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Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10]. The electrical conduction can take place by a transfer of electrons from Mo 5 þ to Mo 6 þ ions [4]. The Mo 6 þ ions participate in the glass network within the [MoO 4 ] and [MoO 6 ] structural units while the Mo 5 þ ions act as modifiers.…”

Section: Introductionmentioning

confidence: 99%

Physical properties and electrochemical performance of molybdenum–lead-germanate glasses and glass ceramics

Rada¹,

Culea²,

Chelcea³

et al. 2013

Ceramics International

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“…[8][9][10] Further, increase in the concentration of the modifier oxide has been found to have profound effect on transport, physical, chemical and optical properties of glasses. [11][12][13][14][15] It is expected that transition metal oxide doped with alkali-modified glasses exhibit both ionic and electronic (polaronic) conduction. 10,16 Generally, alkali-rich glasses exhibit dominant ion conductivity, while TMI-rich glasses exhibit dominant electronic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Conductivity studies on microwave synthesized glasses

et al. 2015

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Conductivity measurements have been made on xV 2 O 5 − (100 − x) [0.5 Na 2 O + 0.5 B 2 O 3 ] (where 10 ≤ x ≤ 50) glasses prepared by using microwave method. DC conductivity (σ ) measurements exhibit temperatureand compositional-dependent trends. It has been found that conductivity in these glasses changes from the predominantly 'ionic' to predominantly 'electronic' depending upon the chemical composition. The dc conductivity passes through a deep minimum, which is attributed to network disruption. Also, this nonlinear variation in σ dc and activation energy can be interpreted using ion-polaron correlation effect. Electron paramagnetic resonance (EPR) and impedance spectroscopic techniques have been used to elucidate the nature of conduction mechanism. The EPR spectra reveals, in least modified (25 Na 2 O mol%) glasses, conduction is due to the transfer of electrons via aliovalent vanadium sites, while in highly modified (45 Na 2 O mol%) glasses Na + ion transport dominates the electrical conduction. For highly modified glasses, frequency-dependent conductivity has been analysed using electrical modulus formalism and the observations have been discussed.

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“…Conduction for semi-conducting behavior in these glasses is strongly influenced by the simultaneous presence of the transition metal ion in two different valence states in the glass network and conduction can occur by the electron transfer from ions in a lower valence state to those in a higher valence state. The charge transport in these glasses is usually considered in terms of the small polaron hopping theory [3,4]. Alkali oxides when added to the oxide glasses, act as network modifiers by giving rise to non-bridging oxygens (NBOs) in the structure.…”

Section: Introductionmentioning

confidence: 99%

“…Alkali oxides when added to the oxide glasses, act as network modifiers by giving rise to non-bridging oxygens (NBOs) in the structure. The modifiers induce defects and further doping has been found to have a profound effect on a number of physical and chemical properties of glasses [3,5,7]. It is expected that in TMO glasses containing modifier ions, a mixture of ionic and polaronic conduction will exist [8].…”

Section: Introductionmentioning

confidence: 99%

Optical properties of glasses in the Li2O–MoO3–P2O5 system

Azmoonfar

Hekmatshoar

Mirzayi

et al. 2008

Ionics

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Glasses xLi 2 O-(50-x)(MoO 3 ) 2 -50P 2 O 5 with x= 10, 20, 30, and 40 mol% were prepared and their optical and electrical properties were investigated. Analysis of the IR spectra revealed that the Li + ions act as a glass modifier that enter the glass network by breaking up other linkages and creating non-bridging oxygens in the network. The optical absorption edge of the glasses was measured for specimens in the form of thin blown films and the optical absorption spectra of those were recorded in the range 200-800 nm. From the optical absorption edges studies, the optical band gap (E opt ) and the Urbach energy (E e ) values have been evaluated by following the available semiempirical theories. The linear variation of (αhν) 1/2 with hν, is taken as evidence of indirect interband transitions. The E opt values were found to decrease with increasing Li 2 O content by causing increase in the number of nonbridging oxygens in network. The Urbach tail analysis gives the width of localized states between 0.48 and 0.74 eV.

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Properties of mixed Li2O and Na2O molybdenum phosphate glasses

Cited by 40 publications

References 26 publications

Physical properties and electrochemical performance of molybdenum–lead-germanate glasses and glass ceramics

Physical properties and electrochemical performance of molybdenum–lead-germanate glasses and glass ceramics

Conductivity studies on microwave synthesized glasses

Optical properties of glasses in the Li2O–MoO3–P2O5 system

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