Structural and electrical characteristics of LiNbO3 embedded in a 34% SiO2 glass matrix

Graça, M.P.F.; Silva, M.G. Ferreira da

doi:10.1016/j.jeurceramsoc.2007.09.045

Cited by 31 publications

(14 citation statements)

References 20 publications

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“…3. To understand the conduction process in partially crystallized glasses, microstructure including the size and orientation of crystallized grains and the nature of crystalline phases must be considered [23,24]. Generally, when a glass undergoes massive crystallization conductivity drops significantly and shows a several order lower magnitude than that of the parent glass.…”

Section: Discussionmentioning

confidence: 99%

Electrical properties of Cr2O3–Fe2O3–P2O5 glasses. Part II

Šantić

Kim

Day

et al. 2010

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 99%

Electrical properties of Cr2O3–Fe2O3–P2O5 glasses. Part II

Šantić

Kim

Day

et al. 2010

Journal of Non-Crystalline Solids

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“…The permittivity was calculated using Equation (2). [30][31][32][33] where C p and R p represent the measured capacitance and resistance, d is the sample thickness, A the electrode area and ɛ 0 the permittivity of the empty space (8.8542 × 10 −12 F/m). The AC conductivity, σ AC , was calculated using the relation (3) [31][32][33][34] :…”

Section: Structural and Morphological Characterizationmentioning

confidence: 99%

Nontoxic glasses: Preparation, structural, electrical and biological properties

Gavinho

Prezas

Ramos

et al. 2019

Int J Applied Ceramic Tech

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Bacterial infections affect about 1 in 5 patients who receive a dental implant within 5 years of surgery. To avoid the implant rejection it is necessary for the development of innovative biomaterials, with addition or substitution of the ions, for implant coatings that promote a strong bond with the new host bone and antibacterial action. The objective of this work was to synthesize a bioactive glass with different silver concentrations to evaluate their antibacterial performance. The glasses were synthesized with up to 2% silver content by melt‐quenching. Structural, morphological, biological, and electrical properties of all samples were studied. The biological behavior was evaluated through cytotoxicity tests and antibacterial activity. The structural analysis shows that the introduction of silver do not promote significant changes, not altering the advantageous properties of the bioglass of the bioglass. It was verified that the glasses with a silver content from 0.5% to 2%, completely prevented the growth of both Staphylococcus aureus and Escherichia coli while being nontoxic toward mammalian cells. Therefore, these bioglasses are promising materials to be used in the production of dental implants with antimicrobial activity.

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“…The temperature was controlled by an Oxford IT-C4 and measured using a platinum sensor; temperatures ranged from 150 to 350 K, in 5 K steps. The real (ε 0 ) and imaginary (ε 0 0 ) parts of the permittivity were calculated using the following relations (El-Mallawany 2011, Graça et al 2007, Belattar et al 2010, and Graça et al 2008:…”

Section: Impedance Measurementsmentioning

confidence: 99%

“…This technique is widely used on material characterization (Graça et al, 2008), but few studies are done on rocks (Silva et al, 2014). Moreover, other dielectric relaxations developed at low temperatures that are of interest for fundamental and Manuscript received by the Editor 4 October 2014; revised manuscript received 4 March 2015; published online 26 May 2015.…”

Section: Introductionmentioning

confidence: 99%

Adsorbed water clusters in garnet cracks detected by impedance and Raman spectroscopies at the supercooled water phase transition

et al. 2015

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The combination of electric impedance and Raman spectroscopies at the analysis of the supercooled water phase transition enables the detection of adsorbed water clusters in garnet minerals of leucogranite samples. This transition is revealed by a change in the parameters measured by both techniques at low temperatures, T c ∼ 220 K, and it is attributed to adsorbed water clusters in the walls of garnet cracks. The study of this transition gives important insights into the water-rock interaction, one of the most important points in the study of rock alteration. The dielectric spectra were fitted to the Havriliak-Negami model of dielectric relaxation and enabled the estimation of the activation energy of the dielectric relaxation process as E a ∼ 76 AE 3 kJ mol −1 , which is higher than the energy attributed to water molecule reorientation in bulk ice. We determined that this energy should be related with the interaction forces between the adsorbed water clusters and the crack walls that hinder the reorientation of those molecules. The logarithmic frequency dependence of the critical transition temperature was also verified. Raman spectra allowed the identification of the water cluster vibration band, ∼3680 cm −1 , in the garnet minerals. The band disappears for temperatures around 423 K where the joint action of the laser beam and the temperature evaporates the adsorbed water clusters. This excludes the possibility that the observed supercooled phase transition could be related with structural water in chlorite minerals. The samples had low apparent porosity ∼1.29%, specific surface area, and adsorption average crack width (using the BrunauerEmmett-Teller method) of ∼0.18 m 2 g −1 and ∼7.92 nm, respectively.

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Structural and electrical characteristics of LiNbO3 embedded in a 34% SiO2 glass matrix

Cited by 31 publications

References 20 publications

Electrical properties of Cr2O3–Fe2O3–P2O5 glasses. Part II

Electrical properties of Cr2O3–Fe2O3–P2O5 glasses. Part II

Nontoxic glasses: Preparation, structural, electrical and biological properties

Adsorbed water clusters in garnet cracks detected by impedance and Raman spectroscopies at the supercooled water phase transition

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