Electrical response of bivalent modifier cations into a vanadium–tellurite glassy matrix

Terny, S.; Cardillo, E.; diPrátula, P.E.; Villar, Marcelo A.; Frechero, M.A.

doi:10.1016/j.jnoncrysol.2013.12.036

Cited by 17 publications

(6 citation statements)

References 23 publications

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“…However, the thermal behavioro ft ernary (80-x )TeO 2 -20ZnOx BaO is distinctive because this property improves thermals tability and increases T g ,a lthough the glass networkopens because NBO is created [40]. Similar observations have been made in (50- [42] glass systemsinwhich T g increases as NBO increases. Nevertheless, structural changes alone are insufficient to explain details of the observedt hermal behavior.…”

Section: Introductionsupporting

confidence: 59%

Optical properties and weakening of elastic moduli with increasing glass transition temperature (T _g) in (80–x)TeO₂-xBaO-20ZnO glasses

Ismail

Supardan

Yahya

et al. 2015

International Journal of Materials Research

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Optical properties and weakeningofelastic moduli with increasing glass transition temperature ( T g ) in (80-x )TeO 2x BaO-20ZnOglassesBaO addition to ternary(80-x )TeO 2 -20ZnO-x BaO ( x=0-20 mol.%) glasses resulted in adecrease in ultrasonic velocities and independent elastic moduli; this result indicated that the rigidity of the glass networkweakened possibly because non-bridgingoxygen increased.Thermal analysis results showed that glass transition temperature increased as BaO content increasedb ecause of the stabilizing effect of Ba 2+ on the glass network. Additional analyses using bulk compression and ring deformation models revealed that the ratio between theoretical bulk modulus and experimental bulkm odulus increased;t his result indicated that the compression mechanism mainly involved isotropic ring compression. Furthermore, the increase in non-bridging oxygen formationw ith BaO addition caused ad ecrease in optical energy gap and an increase in refractive index. An increase in Urbach energy indicated that the degree of disorder in the glass system also increased.

show abstract

Section: Introductionsupporting

confidence: 59%

Optical properties and weakening of elastic moduli with increasing glass transition temperature (T _g) in (80–x)TeO₂-xBaO-20ZnO glasses

Ismail

Supardan

Yahya

et al. 2015

International Journal of Materials Research

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“…The lack of welldefined peak indicates absence of any long range order and confirms the amorphous nature of all the samples. 37 The IR absorption spectra of all the glass samples are shown in Figure 2, while the deconvolution of the spectrum for the x = 2 mol% glass sample is shown in Figure 3. Four major IR absorption bands were observed, namely, 447-475, 574-587, 666-696, and 788-804 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Anomalous dielectric constant and AC conductivity in mixed transition-metal-ion xFe2O3–(20 – x)MnO2–80TeO2 glass system

et al. 2016

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Glasses with xFe 2 O 3 -(20−x MnO 2 -80TeO 2 (x = 2, 5, 10, 15, and 20 mol%) composition were prepared by meltquenching technique to investigate the effects of mixed-transition metal ion Fe 2+/3+/ /Mn 3+/4+ on AC conductivity and dielectric properties using impedance spectroscopy. Dielectric constant showed strong variation with Fe 2 O 3 at a frequency ≥10 kHz, where decreased to a minimum value at x = 10 mol% before increasing for x > 10%. The decrease in may be attributed to some form of hindrance effect on heavy dipoles caused by the mixed transition-ion effect (MTE). Meanwhile, variation of AC conductivity with Fe 2 O 3 showed non-linear increase for x ≤ 10 mol% before dropping to a minimum at 15 mol% Fe 2 O 3 . This result was attributed to Anderson localization because of the disorder in the glass system. Conductivity analysis showed that the conduction mechanism at the dispersion region for x = 2 mol% followed the correlated barrier hopping (CBH) model, while the mechanism transformed to the overlapping large polaron tunnelling (OLPT) model at higher Fe 2 O 3 , content (x > 2 mol%). The electric modulus of the investigated samples showed asymmetric peak of the imaginary part of electric modulus (M ), which reflected a non-Debye type relaxation.

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“…BaO increases nonbridging oxygen, but Ba 2+ stabilizes the glass network in this study and thus, increase in T g seemed to be attributable to increase in contents. [11][12][13] ZrO 2 plays the role of both the forming agent and intermediate agent and Zr 4+ increases bridging oxygen within glass network and thus, the more content of ZrO 2 the higher T g . 14,15) Figure 2 shows refractive index of the glasses depending on variation in the content of BaO and ZrO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…It's well known that more content of BaO and ZrO 2 , the higher refractive index. [10][11][12][13][14][15] To increase the refractive index of the glass based on such fact, the content of BaO was increased from 25 mol% to 40 mol% and refractive index of the glass depending on change to the content of ZrO 2 was checked. Consequently, refractive index of the glass when the content of BaO was 40 mol%, was higher than 25 mol%.…”

Section: Resultsmentioning

confidence: 99%

Effect of Zirconium Dioxide in BaO-ZnO-B2O3-SiO2 system on Optical Properties of Color Conversion Glasses

Jeong

Jeon

Kim

et al. 2016

J. Korean Ceram. Soc

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The effect of zirconium dioxide (ZrO 2) on the properties of color conversion glasses was examined in the BaO-ZnO-B 2 O 3-SiO 2 system. The difference in refractive index between glass and phosphor affect the optical properties of the color conversion glass because of light scattering. Reducing the difference in refractive index is a method to improve the luminous efficacy of color conversion glasses. As a reference, a type of glass that contains 25 mol% of each component was used. To increase the refractive index of the glass samples, the BaO content was increased from 25 to 40 mol%, and ZrO 2 was added at levels of 1, 3, and 5 mol%. Color conversion glasses were prepared by sintering a mixture of glass and 5 wt% YAG:Ce 3+ phosphor. As a result, the refractive index of the glass was found to be dependent on the BaO and ZrO 2 contents in the BaO-ZnO-B 2 O 3-SiO 2 system. As the BaO and ZrO 2 contents were increased, the luminous efficacy of the color conversion glass was improved because the refractive index difference between the glass and the YAG:Ce 3+ phosphor decreased.

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Electrical response of bivalent modifier cations into a vanadium–tellurite glassy matrix

Cited by 17 publications

References 23 publications

Optical properties and weakening of elastic moduli with increasing glass transition temperature (T _g) in (80–x)TeO₂-xBaO-20ZnO glasses

Optical properties and weakening of elastic moduli with increasing glass transition temperature (T _g) in (80–x)TeO₂-xBaO-20ZnO glasses

Anomalous dielectric constant and AC conductivity in mixed transition-metal-ion <I>x</I>Fe<SUB>2</SUB>O<SUB>3</SUB>–(20 – <I>x</I>)MnO<SUB>2</SUB>–80TeO<SUB>2</SUB> glass system

Effect of Zirconium Dioxide in BaO-ZnO-B2O3-SiO2 system on Optical Properties of Color Conversion Glasses

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Electrical response of bivalent modifier cations into a vanadium–tellurite glassy matrix

Cited by 17 publications

References 23 publications

Optical properties and weakening of elastic moduli with increasing glass transition temperature (T g) in (80–x)TeO2-xBaO-20ZnO glasses

Optical properties and weakening of elastic moduli with increasing glass transition temperature (T g) in (80–x)TeO2-xBaO-20ZnO glasses

Anomalous dielectric constant and AC conductivity in mixed transition-metal-ion <I>x</I>Fe<SUB>2</SUB>O<SUB>3</SUB>–(20 – <I>x</I>)MnO<SUB>2</SUB>–80TeO<SUB>2</SUB> glass system

Effect of Zirconium Dioxide in BaO-ZnO-B2O3-SiO2 system on Optical Properties of Color Conversion Glasses

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Optical properties and weakening of elastic moduli with increasing glass transition temperature (T _g) in (80–x)TeO₂-xBaO-20ZnO glasses

Optical properties and weakening of elastic moduli with increasing glass transition temperature (T _g) in (80–x)TeO₂-xBaO-20ZnO glasses