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Effects of In-situ Generated Coinage Nanometals on Crystallization and Microstructure of Fluorophlogopite Mica Containing glass-ceramics

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Journal of Materials Science & Technology 2015年第1期31卷 110-119页

作者： Mrinmoy Garai Nibedita Sasmal Atiar Rahaman Molla Anal Tarafder Basudeb Karmakar glass Science & Technology Section Glass DivisionCSIR-Central Glass & Ceramic Research Institute

The effects of in-situ generated coinage nanometals（Cu,Ag and Au） on crystallization behavior,microstructure,thermal and mechanical properties of SiO2-MgO-Al2O3-B2O3-K2O-MgF2（BMAPS） glassceramics were systematically *** addition of coinage nanometai,the glass transition temperature（Tg） is increased by 20-30 ℃,crystallization temperature（Tc） by 30-50 ℃ and dilatometric softening temperature（Td） by 10-25 ℃.It was found that the density of Cu-containing glass was 2.59 g cm-3and for other glasses it was in the range of 2.56-2.57 g *** the non-isothermal differential scanning calorimetry study,the activation energy of crystallization for BMAPS base glass was calculated as 344 kJ/mol,and changed to 406,334 and 274 kJ/mol on addition of Cu,Ag and Au-nanometals,*** evolved in the opaque BMAPS glass-ceramics derived by controlled heat treatment,were identified as fluorophlogopite mica(KMg3(AlSi3O10)F2) by X-ray diffraction（XRD） technique and confirmed by Fourier transformed infrared *** of copper,silver and gold nanometals were also identified by XRD *** is found from field emission scanning electron microscopy that the interlocked grain like microstructure developed in BMAPS glass-ceramics（being heat-treated at 1050 ℃ for 4 h） changed to denser house-of-cards like microstructure（containing smaller sized mica crystals） on addition of coinage *** of BMAPS base glass-ceramic was 2.60 g cm-3and marginally changed to 2.61-2.62 g cm-3on addition of Cu,Ag and *** change in microstructure resulted in the decrease of Vickers micro hardness value from 5.37 to 4.12,4.20 and 4.58 GPa on addition of Cu,Ag and Au,*** nanometai doped mica glass-ceramics containing interlocked microstructure with higher thermal expansion coefficient,hence,is suitable for high temperature sealing application（like solid oxide fuel cell）.

关键词： glass Crystallization X-ray diffraction Microstruc

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Development of non-shrinkable ceramic composites for use in high-power microwave tubes

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 516-522页

作者： N.Dandapat S.Ghosh Bioceramics and Coating Division CSIR-Central Glass and Ceramic Research Institute

Al_2O_3–CaO–SiC-based ceramic composites with four different compositions were sintered at 1700℃ for 3 h in an air furnace. The phase analysis, microstructural characterization, and elemental composition determination of the developed composites were performed by X-ray diffraction(XRD), field-emission scanning electron microscopy(FESEM), and energy-dispersive X-ray(EDAX) analysis, respectively. The shrinkage, thermal properties, and electrical resistivity of the composites were also studied. The experimental results showed the effects of adding silicon carbide and calcia to alumina on the thermal, electrical, and shrinkage properties of the resultant composites. Among the four investigated ceramic composites, the one composed of 99 wt% alumina, 0.5 wt% CaO, and 0.5 wt% SiC exhibited the best characteristics for use as a potting material in a dispenser cathode of a microwave tube. The material exhibited slight expansion instead of shrinkage during drying or firing. Other properties of the composite powder, such as its thermal properties and electrical resistivity, were comparable to those of a commercial alumina powder.

关键词： Al2O3-CaO-SiC composite expansion potting material dispenser cathode microwave tube

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Observation of trapped light induced by Dwarf Dirac-cone in out-of-plane condition for photonic crystals

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Chinese Physics B 2016年第10期25卷 314-322页

作者： Subir Majumder Tushar Biswas Shaymal K Bhadra Fiber Optics and Photonics Division CSIR-Central Glass and Ceramic Research Institute

Existence of out-of-plane conical dispersion for a triangular photonic crystal lattice is reported. It is observed that conical dispersion is maintained for a number of out-of-plane wave vectors（k;）. We study a case where Dirac like linear dispersion exists but the photonic density of states is not vanishing, called Dwarf Dirac cone（DDC） which does not support localized modes. We demonstrate the trapping of such modes by introducing defects in the crystal. Interestingly, we find by k-point sampling as well as by tuning trapped frequency that such a conical dispersion has an inherent light confining property and it is governed by neither of the known wave confining mechanisms like total internal reflection, band gap guidance. Our study reveals that such a conical dispersion in a non-vanishing photonic density of states induces unexpected intense trapping of light compared with those at other points in the continuum. Such studies provoke fabrication of new devices with exciting properties and new functionalities.

关键词： band structure photonic band gap materials multilayers superlattices photonic structures meta-materials

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Effect of Nd^(3+) on spectroscopic properties of lithium borate glasses

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Journal of Rare Earths 2014年第12期32卷 1148-1153页

作者： D.D.Ramteke K.Annapurna V.K.Deshpande R.S.Gedam Department of Applied Physics Visvesvaraya National Institute of Technology glass Science and Technology Section CSIR-Central Glass and Ceramic Research Institute

The spectroscopic properties of lithium borate glasses as a function of Nd3＋ ions concentration were *** absorption spectra of these glasses showed a number of absorption bands in ultra violet and visible *** absorption edge was found to shift towards the longer wavelength（red shift） with increase in *** spectra revealed three major bands at 902, 1063 and 1334 nm which was due to 4F3/2→4I9/2, 11/2 ＆13/2 transitions of Nd3＋ *** intensity was maximum for 1 mol.% Nd2O3 and further increase in Nd2O3 resulted in luminescence *** luminescence quenching behavior at higher concentration of Nd2O3 was attributed to the Nd3＋-Nd3＋ interaction in the glass *** absorption and emission property of these glasses suggested that these glasses could be useful for 1.06 μm infrared laser applications.

关键词： glasses optical properties luminescence laser rare earths

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Layered double hydroxide using hydrothermal treatment： morphology evolution, intercalation and release kinetics of diclofenac sodium

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Frontiers of Materials Science 2017年第4期11卷 395-409页

作者： Mathew JOY SrividhyaJ. IYENGAR Jui CHAKRABORTY Swapankumar GHOSH Project Management Division CSIR-Central Glass & Ceramic Research Institute Kolkata-700032 India Bioceramics & Coating Division CSIR-Central Glass & Ceramic Research Institute Kolkata-700032 India

The present work demonstrates the possibilities of hydrothermal trans- formation of Zn-AI layered double hydroxide （LDH） nanostructure by varying the synthetic conditions. The manipulation in washing step before hydrothermal treatment allows control over crystal morphologies, size and stability of their aqueous solutions. We examined the crystal growth process in the presence and the absence of extra ions during hydrothermal treatment and its dependence on the drug （diclofenac sodium （Dic- Na）） loading and release processes. Hexagonal plate-like crystals show sustained release with -90% of the drug from the matrix in a week, suggesting the applicability of LDH nanohybrids in sustained drug delivery systems. The fits to the release kinetics data indicated the drug release as a diffusion-controlled release process. LDH with rod-like morphology shows excellent colloidal stability in aqueous suspension, as studied by photon correlation spectroscopy.

关键词： layered double hydroxide crystal morphology hydrothermal treatment drug loading

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Preparation,crystallization,microstructure and dielectric properties of lead bismuth titanate borosilicate glass ceramics

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Journal of Advanced ceramics 2014年第3期3卷 194-206页

作者： Chandkiram RGAUTAM Abhishek MADHESHIYA Ranabrata MAZUMDER Advanced glass and glass ceramic Research Laboratory Department of PhysicsUniversity of LucknowLucknow 226007India Department of ceramic Engineering National Institute of TechnologyRouerkela 769008India

Various bulk and transparent glasses were prepared by rapid melt quenching technique in the glass system 55[(Pb_(x)Bi_(1-x))TiO_(3)]-44[2Si_(O)2B_(2)O_(3)]-La2O3(x=0-0.7).The X-ray diffraction(XRD)studies of the glass samples confirmed the amorphous *** differential thermal analyses(DTA)were carried out from room temperature to 900℃with a heating rate of 10℃/*** DTA patterns of the samples showed one or more exothermic sharp peaks shifting towards lower temperature side with increasing concentration of bismuth oxide(BiO).On the basis of DTA results,the solid solution of bismuth titanum oxide(Bi_(2)Ti_(2)O_(7))/lead bismuth titanium oxide(Pb3Bi4Ti6O21)was precipitated in borosilicate glassy matrix as a major *** glasses were subjected to 4 h and 8 h heat treatment schedules to convert into glass *** analysis of these glass ceramic samples showed that the major crystalline phase of the entire glass ceramic samples with 0≤x≤0.5 is found to have cubic crystal structure,while it is tetragonal for glass ceramic sample with x=*** scanning electron microscopy(SEM)micrographs indicated the uniform distribution of Bi_(2)Ti_(2)O_(7)and Pb3Bi4Ti6O21 crystallites in the glassy matrix.

关键词： lead bismuth titanate differential thermal analysis(DTA) crystallization scanning electron microscopy(SEM) dielectric behavior

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Spectroscopic investigation confirms retaining the pristine nature of single-walled carbon nanotubes on dissolution in aniline

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Frontiers of Materials Science 2017年第3期11卷 276-283页

作者： Somdutta SINGHA Swapankumar GHOSH Project Management Division CSIR-Central Glass & Ceramic Research Institute Kolkata-700032 India

Carbon nanotubes in all forms are very much insoluble in both organic and inorganic solvents due to its high agglomeration and entangled morphology. General methods for dissolution of single-walled carbon nanotubes （SWNTs） are mostly associated with complexation or polymerization or addition of macromolecules which change the physical or chemical properties of SWNTs and the pristine nature of SWNTs is lost. Dissolution of SWNTs in a solvent like aniline is practiced here which is a very simple reaction method. Here aniline is capable to form a SWNT-aniline charge transfer complex without attachment of macromolecules or polymer which is also soluble in other organic solvents. Solvation of SWNTs by this method is also capable of maintaining the similarity between the structure of SWNTs before and after the dissolution, which means that the pristine nature of SWNTs is preserved. Formation of charge transfer complex in this reaction has been proven by UV-Vis/NIR absorption and photoluminescence spectroscopy. Raman spectroscopy and electron microscopy （FESEM and TEM） are the evidences for protection of the pristine nature of SWNTs even after high-temperature complexation reaction with aniline and also after solubilization in organic solvents.

关键词： single-walled carbon nanotubes aniline dissolution organic solvent spectroscopy

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Structural and electrical transport properties of a rare earth double perovskite oxide:Ba_2ErNbO_6

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Journal of Rare Earths 2014年第4期32卷 334-342页

作者： Rajesh Mukherjee Binita Ghosh Sujoy Saha Chandrahas Bharti T.P.Sinha Department of Physics Ramananda College Department of Physics Bose Institute Sensor and Actuator Division CSIR-Central Glass and Ceramic Research Institute

The double perovskite oxide barium erbium niobate, Ba2ErNbO6 （BEN） was synthesized by solid state reaction technique. Rietveld refinement of the X-ray diffraction pattern of the sample showed cubic （Fm3m） phase at room temperature. Fourier trans-form infrared spectrum showed two primary phonon modes of the sample at around 387 and 600 cm-1. Raman spectrum of the sam-ple taken at 488 nm excitation wavelength showed four primary strong peaks at 106, 382, 747 and 814 cm-1. Lorentzian lines with 10 bands were used to fit the Raman spectrum. A group theoretical study was performed to assign all the Raman modes. Impedance spectroscopy was applied to investigate the ac electrical conductivity of BEN in a temperature range from 303 to 673 K and in a fre-quency range from 100 Hz-1 MHz. The dielectric relaxation mechanism was discussed in the frame work of permittivity, conduc-tivity, modulus and impedance formalisms. The complex plane plot of the impedance data was modeled by an equivalent circuit con-sisting of two serially connected R-CPE units, （one for the grain and the other for the grain boundary）, each containing a resistor （R） and a constant phase element （CPE）. The R-CPE units were used to incorporate the non-ideal character of the polarization phenome-non instead of an ideal capacitive behaviour. The relaxation time corresponding to dielectric loss was found to obey the Arrhenius law with activation energy of 0.85 eV. The frequency dependent conductivity spectra followed the Jonscher power law. The Cole-Cole model was used to investigate the dielectric relaxation mechanism in the sample.

关键词： perovskites Rietveld refinement Raman spectroscopy impedance spectroscopy rare earths

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Core Shell Au Ag Nanoparticles in Dielectric Nanocomposites with Plasmon-Enhanced Fluorescence: A New Paradigm in Antimony glasses

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Nano Research 2009年第8期2卷 607-616页

作者： Tirtha Som Basudeb Karmakar glass Technology Laboratory Glass DivisionCentral Glass and Ceramic Research Institute(Council of Scientifi c and Industrial Research)196Raja S.C.Mullick RoadKolkata 700032India

The nano era demands the synthesis of new nanostructured materials,if possible by simplified techniques,with remarkable properties and versatile ***,we demonstrate a new single-step reproducible melt-quench methodology to fabricate core-shell bimetallic(Au0 Ag0)nanoparticles(2889 nm)embedded glasses(dielectrics)by the use of a new reducing glass matrix,K_(2)O B_(2)O_(3) Sb_(2)O_(3)(KBS)without applying any external reducing agent or multiple processing *** surface plasmon resonance(SPR)band of these nanocomposites embedded in KBS glass is tunable in the range 554-681 *** remarkably,taking advantage of the selective reduction capability of Sb_(2)O_(3),this single-step methodology is used to fabricate inter-metallic:rare-earth ions co-embedded(AuAg:Sm^(3+))dielectric(glass)-based-dnanocomposites and study the effect of enhanced local fi eld on the red upconversion fl uorescence of Sm^(3+)ions at 636 *** enhancement is found to be about 2 *** single-step in-situ selective reduction approach can be used to fabricate a variety of hybrid-nanocomposite devices for laser based applications(see supplementary information).

关键词： Gold-silver nanostructures core-shell morphology surface plasmon resonance antimony glass metal-enhanced rare earth fl uorescence

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Clean Steel Technologies Based on Interactions of Refractory Filtering Materials with Steel Melt

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China's Refractories 2016年第3期25卷 1-10页

作者： Christos G.ANEZIRIS Enrico STORTI Steffen DUDCZIG Harry BEREK Anne SCHMIDT Jana HUBALKOVA institute of ceramic Glass and Construction MaterialsTechnical University of Freiberg

New carbon bonded filters with “active and reactive coatings ” for higher filtration efficiency of alumina based inclusions as well as nano-engineered filters with nano-scaled additives are explored with the aid of impingement tests and are evaluated according to their cold crushing strengths at room temperature. The combination of carbon nanotubes and alumina nanosheets additives leads to in situ formation of Al3 CON. Both the nanoscaled additives as well as the extra alumina “active”coating lead to improved mechanical performance of the carbon bonded filters and open the horizon for filter macrostructures with higher filtration capacities in means of bigger dimensions. In a further step MWCNT（ multi walled carbon nanotubes） in combination with a synthetic pitch have been used as a functional coating on the surface of alumina carbon bonded filters. These filters have then been evaluated also with uncoated filters in a special casting simulator and the interactions between steel and filtering material have been investigated.

关键词： filtering materials nanoscaled additive carbon bonded compositions

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