Academic literature on the topic 'Dielectric Spectra - Glass Network Structure'

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Journal articles on the topic "Dielectric Spectra - Glass Network Structure"

1

Xu, Xing Jun, Yun Long Yue, Hai Tao Zhang, and Zhao Du. "Effect of MgO on Structure and Properties of CaO-Al2O3-SiO2 Glass System." Advanced Materials Research 306-307 (August 2011): 531–34. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.531.

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CaO-Al2O3-SiO2system glasses with MgO were prepared by melt quenching. The glass structure was characterized by Infrared spectra (IR) and Differential Thermal Analysis (DTA). Dielectric properties, devitrification and chemical durability have been studied. IR spectra and DTA indicated that glass network structure change by doping MgO. The glass chemical improved and dielectric constant decreased after doping with MgO. The glass shows a severe tendency of phase separation.
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2

Rani, S., S. Sanghi, A. Agarwal, and N. Kishore. "Study of Structure and Li+ Ions Dynamics in Presence of Fe2O3 in Bi2O3∙B2O3 Glasses." Solid State Phenomena 161 (June 2010): 51–61. http://dx.doi.org/10.4028/www.scientific.net/ssp.161.51.

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Glasses having composition xLi2O∙(30-x)Fe2O3∙20Bi2O3∙50B2O3 (0 ≤ x ≤ 30, in mol%) have been prepared using normal melt-quench technique. The variation in density and molar volume with composition has been investigated in terms of the structural modification that takes place in the glass matrix on decreasing Fe2O3. Infrared spectra of these glasses were recorded over continuous spectral range (400-4000 cm-1) in an attempt to study their structure systematically. IR spectra show that with increase in Li2O/Fe2O3 ratio there is formation of more structural units (e.g. [FeO4/2]-Li+) in the glass ne
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3

Modak, D. K., G. Banerjee, M. Karar, et al. "Nonlinear physical properties of some nonconventional semiconducting Bi–Pb–Ba–O glasses." Journal of Materials Research 13, no. 8 (1998): 2328–33. http://dx.doi.org/10.1557/jmr.1998.0325.

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Semiconducting Bi1−xPbxBaO3−δ (or BPB) glasses with x = 0 to 0.8 have been prepared by fast quenching from the melt. Interesting anomalies in the temperature-dependent polaronic conductivity and dielectric constant have been observed in all these glass compositions at temperatures, Tp, varying from 310 to 330 K (depending on Pb concentration). This nonlinear behavior is considered to be associated with the local ordering or the displacements of the BiO3 type pyramidal structural units present in the glass matrix (observed from the infrared spectra of these glasses). This type of ordering/displ
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4

Yan, Hong Qiang, Hua Qing Wang, Jie Cheng, and Zheng Ping Fang. "Cure of Neat Resins and Properties of Composites for Interpenetrating Polymer Networks from the Novel Bismaleimide and Cyanate Containing Naphthalene." Advanced Materials Research 233-235 (May 2011): 1636–41. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.1636.

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To obtain attractive properties, such as increased resistance to moisture absorption, low dielectric constant and low dielectric loss, the novel bismaleimide, viz. 2,7-bis(4-maleimidophenoxy) naphthalene (BMPN), and dicyanate ester, viz. 2,7-dihydroxynaphthalene dicyanate (DNCY), containing naphthalene ring and ether linkages, have been synthesized. The cure process of the blends including of 0.11mmol/mol Fe(AcAc)3 and 2% nonylphenol is characterized by in-situ FTIR. The result obtained from in-situ FTIR spectra of cured resin illuminates that the cure reaction is homo-polymerized respectively
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5

Basu, S., J. R. Macdonald, and D. Chakravorty. "Conductivity relaxation in the interfacial phase of iron core–iron oxide shell nanocomposites." Journal of Materials Research 21, no. 7 (2006): 1704–11. http://dx.doi.org/10.1557/jmr.2006.0231.

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The alternating current electrical conductivity of a gel-derived glass of composition 55Fe2O3⋅45SiO2 (mol%) was measured over a frequency range of 100 Hz to 6 MHz. The gel was subjected to a reduction treatment at 923 K for ½ h and subsequently heated in ordinary atmosphere at a temperature 773 K for ½ h to grow a Fe-core Fe3O4 shell nanostructure with a median diameter of 6.2 nm. This formed a percolative network within the silica gel. Mossbauer spectra confirmed the presence of Fe3O4 in the nanoshell. Electrical measurements were also carried out on these nanocomposites at different frequenc
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6

Singh, N. L., Chaitali Gavade, and P. K. Khanna. "Swift Heavy Ion Induced Modification in Physical Properties of Poly Methylmethacrylate (PMMA)/Nickel (Ni) Nanocomposites." Defect and Diffusion Forum 341 (July 2013): 51–68. http://dx.doi.org/10.4028/www.scientific.net/ddf.341.51.

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We have These films were irradiated with 85 MeV C-ions at the fluences of 1 x 1011 and 1 x 1012 ions/cm2. Changes in the optical, structural, dielectric, magnetic and thermal properties of (PMMA)/Ni nanocomposites of different concentrations of nickel nanoparticles (5%, 10%, 15%) due to swift heavy ion irradiation were studied by means of UVvisible spectroscopy, X-ray diffraction, impedance gain phase analyzer, SQUID and differential scanning calorimetry. Optical properties like band gap were estimated for pure polymer and nanocomposite films from their optical absorption spectra in the wavele
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7

Yuan, X. M., S. M. Lu, X. H. Zhang, Y. J. Cui, H. T. Wu, and Y. L. Yue. "Effects of CaO Additions on the Structure and Dielectric Properties of Aluminoborosilicate Glasses." Advanced Materials Research 710 (June 2013): 127–31. http://dx.doi.org/10.4028/www.scientific.net/amr.710.127.

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Glasses with compositions xCaO-(60-x)SiO2-5MgO-15Al2O3-20B2O3 (x=0, 3, 6 and 9 mol %) were prepared by conventional melting method. Fourier-transform infrared spectroscopy (FTIR) indicated that the addition of CaO converted trigonal boron ([B) to tetrahedral boron ([B). The glass transition temperatures (Tg) were determined using a differential scanning calorimetry (DSC). Tg increased with increasing CaO content. Thus, the addition of CaO instead of SiO2 strengthened the glass network. The dielectric εr and loss tanδ were measured for the MgO-B2O3-Al2O3-SiO2 glass system in the frequency range
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8

Shao, Hui, Hong Qing Zhou та Xiao Dong Shen. "The Influence of B2O3 on the Microstructures and Properties of CaO-B2O3-SiO2-Al2O3 Glass-Ceramics (α-Al2O3) System". Advanced Materials Research 189-193 (лютий 2011): 4466–71. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.4466.

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The glass composition CaO-Al2O3-B2O3-SiO2 as an alternative glass composition, and commercial α-Al2O3 as a ceramic material was used. The structure of the glass was analyzed by infrared spectra; the glass-ceramics thermal expansion coefficient was measured by dilatometer, the phase separation of the sample was investigated by scanning electron microscope and the component of phase was analyzed by X-ray. The results show that [BO3] increases and [BO4] decreases in the glass structure with the increasing of B2O3 content added into CaO-Al2O3-B2O3-SiO2 glass. The relative density and dielectric co
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9

DU, ZHAO, XUEHONG ZHANG, YUNLONG YUE, and HAITAO WU. "EFFECT OF MgO ON STRUCTURE AND DIELECTRIC PROPERTIES OF CaO–Al2O3–B2O3–SiO2 GLASSES." Surface Review and Letters 19, no. 06 (2012): 1250063. http://dx.doi.org/10.1142/s0218625x12500631.

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The effect of MgO on structure and dielectric properties of aluminoborosilicate glasses was investigated. FTIR data indicated that glass network was mainly built by tetrahedral [ SiO4 ], [ BO4 ], [ AlO4 ] and trigonal [ BO3 ]. A small amount of AlO5 or AlO6 units also existed. The glass system was characterized with lower dielectric constant (4.17 ~ 4.6) and dielectric loss (12.3 × 10-4 ~ 14.77 × 10-4) at 1 MHz. With the increase of MgO content, the quantity of AlO5 or AlO6 units decreased. The variation of density showed a decreasing tendency. The dielectric constant and loss were all found t
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10

Herrmann, Andreas, Mohamed Zekri, Ramzi Maalej, and Christian Rüssel. "The Effect of Glass Structure on the Luminescence Spectra of Sm3+-Doped Aluminosilicate Glasses." Materials 16, no. 2 (2023): 564. http://dx.doi.org/10.3390/ma16020564.

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Peralkaline Sm3+-doped aluminosilicate glasses with different network modifier ions (Mg2+, Ca2+, Sr2+, Ba2+, Zn2+) were investigated to clarify the effect of glass composition and glass structure on the optical properties of the doped Sm3+ ions. For this purpose, the Sm3+ luminescence emission spectra were correlated with the molecular structure of the glasses derived by molecular dynamics (MD) simulations. The different network modifier ions have a clear and systematic effect on the peak area ratio of the Sm3+ emission peaks which correlates with the average rare earth site symmetry in the gl
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