Mixed polaronic-ionic conduction in lithium borate glasses and glass-ceramics containing copper oxide

Khalil, Magda M. I.

doi:10.1007/s00339-006-3802-y

Cited by 12 publications

(8 citation statements)

References 23 publications

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“…Experimental IR data indicate that only very small variations are observed when transition metal oxides are Iron (II), Fe +2 3d 7 Cobalt (II), Co +2 5.601 3d 8 Nickel (II), Ni +2 5.612 3d 9 Copper (II), Cu +2 5.568 Table 1 and the experimental IR spectra are realized and interpreted in the following points:…”

Section: Resultsmentioning

confidence: 97%

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The Elusory Role of Low Level Doping Transition Metals in Lead Silicate Glasses

Abdelghany

2010

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A deconvolution method based iterative system was employed for the analysis of Infrared (IR) absorption spectra of some prepared lead silicate unfilled glasses together with samples filled with a low doping level of one of the first 3d-transition metal oxides (TMO's) (TiO 2 →CuO) in the region of 4,000-400 cm -1 . The IR spectra were analyzed to determine, evaluate, differentiate the various vibrational modes and to retrace precisely the role of low level doping of the different TMO's in the structural changes. The first examination reveals a close similarity between the different transition metals doped samples, but careful inspection indicates there are some minor differences depending on the type of TM ions. These observed data are correlated with the similarity of the 3d orbitals in the neutral atoms and when the atoms are ionized. It was also observed that the 3d orbitals become more stable than the 4s orbitals.

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Section: Resultsmentioning

confidence: 97%

“…The physical properties, electrical, optical and mechanical properties [8,9] of various transition-metal ions doped glasses have been under investigation in recent years in view of their technological applications especially in lasers, phosphors, solar energy converters, plasma display panels and in a number of electronic devices.…”

Section: Introductionmentioning

confidence: 99%

The Elusory Role of Low Level Doping Transition Metals in Lead Silicate Glasses

Abdelghany

2010

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“…The lower of the two values is related to hopping of small polarons [43]. The mixed polaronic-ionic conductivity was investigated for Li 2 B 8 O 13 glasses doped with different amounts of CuO [44]. The temperature of transition from polaronic to ionic conductivity varied from 420 K to approximately 450 K depending on CuO concentrations, and activation energy of ionic conductivity varied from 0.8 to 1.22 eV [44].…”

Section: Thermoluminescence Mechanisms and Trapsmentioning

confidence: 99%

“…The mixed polaronic-ionic conductivity was investigated for Li 2 B 8 O 13 glasses doped with different amounts of CuO [44]. The temperature of transition from polaronic to ionic conductivity varied from 420 K to approximately 450 K depending on CuO concentrations, and activation energy of ionic conductivity varied from 0.8 to 1.22 eV [44]. The investigations of charge transport in undoped Li 2 B 4 O 7 single crystals and glasses [38] demonstrated high activation energy of conductivity through Li + ion hopping (1.22 eV).…”

Section: Thermoluminescence Mechanisms and Trapsmentioning

confidence: 99%

Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms

Ratas¹,

Danilkin²,

Kerikmäe³

et al. 2012

Proc. Estonian Acad. Sci.

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Thermoluminescence curves, kinetics, and Electron Paramagnetic Resonance (EPR) data were compared for Li 2 B 4 O 7 :Mn and Li 2 B 4 O 7 :Mn,Be radiation detectors. Analysis of the experimental data, both our own and published by other investigators, in connection with features of the crystal lattice structure allowed us to build models of traps and thermoluminescence mechanisms. The thermoluminescence peaks used in dosimetry are connected with the release of holes trapped at bridging oxygen near Mn 2+ (or Be 2+ ), substituting for tetrahedrally coordinated B 3+ . The luminescence occurs at Mn 2+ substituting for Li + . Two types of Mn 2+ centres give different luminescence and EPR spectra. The effects of Mn 2+ interaction with surrounding oxygen atoms are discussed both for the Mn 2+ luminescence band and for the hyperfine structure of EPR. Kinetics measurements revealed an additional "hopping" barrier for a hole to get to a recombination centre after it has been released from a trap. A simple kinetics model is suggested to describe the experimental data. The studies of optical stimulation spectra and optically stimulated emptying of traps demonstrated the possibility of using Li 2 B 4 O 7 :Mn and Li 2 B 4 O 7 :Mn,Be radiation detectors with optically stimulated readout systems.

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“…Physical, electrical, optical and mechanical properties [9] of various transition-metal ions doped glasses have been under investigation in recent years in view of their technological applications especially in lasers, phosphors, solar energy converters, plasma display panels and in a number of electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Infrared Absorption Spectra of Some Na-Borosilicate Glasses Containing AgBr and Cu2O (Photochromic Glasses) in Addition to One of Transition Metal Oxide

Saad

ElBatal

Fayad

et al. 2011

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Infrared absorption spectroscopy measurements for a number of Na-borosilicate glasses containing AgBr and Cu 2 O were carried out in order to elucidate the structure of these glasses and the forms in which the transition metal ions exist in it. The raw materials used were of chemically pure grade and were finely pulverized. The temperature of the melting was 1,450°C for 2 h and the samples were then annealed at 480°C. The prepared glasses studied were then heat treated at 600°C for 1 h and cooled inside the furnace. The absorption measurements in the Infrared region of the spectrum were recorded in range of (4,000-400) cm −1 using a Jacso FT-IR 300E Infrared spectrophotometer for all glasses studied. The experimental results obtained showed characteristic variations of the position and intensity of the absorption bands with the glass composition. The effect of the different transition metal oxides on the deformation of the groups present was investigated.

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Mixed polaronic-ionic conduction in lithium borate glasses and glass-ceramics containing copper oxide

Cited by 12 publications

References 23 publications

The Elusory Role of Low Level Doping Transition Metals in Lead Silicate Glasses

The Elusory Role of Low Level Doping Transition Metals in Lead Silicate Glasses

Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms

Infrared Absorption Spectra of Some Na-Borosilicate Glasses Containing AgBr and Cu2O (Photochromic Glasses) in Addition to One of Transition Metal Oxide

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Mixed polaronic-ionic conduction in lithium borate glasses and glass-ceramics containing copper oxide

Cited by 12 publications

References 23 publications

The Elusory Role of Low Level Doping Transition Metals in Lead Silicate Glasses

The Elusory Role of Low Level Doping Transition Metals in Lead Silicate Glasses

Li2B4O7:Mn for dosimetry applications: traps and mechanisms

Infrared Absorption Spectra of Some Na-Borosilicate Glasses Containing AgBr and Cu2O (Photochromic Glasses) in Addition to One of Transition Metal Oxide

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Product

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Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms