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  • Journal of Alloys and Compounds
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  • 1
    Language: English
    In: Journal of Alloys and Compounds, Nov 5, 2015, Vol.648, p.1083(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2015.07.025 Byline: Vijay Singh Abstract: Gadolinium activated BaZrO.sub.3 phosphor has been prepared by the solution combustion method. Powder X-ray diffraction and scanning electron microscopy methods are used to characterize the prepared phosphor. Electron paramagnetic resonance (EPR) spectra of un-doped and gadolinium activated BaZrO.sub.3 phosphor has been studied. Pure BaZrO.sub.3 exhibits an EPR spectrum which is a superposition of spectra from two distinct centers. One of the centers (center I) with an isotropic g factor 2.0016 is tentatively assigned to an F.sup.+ -type center (singly ionized oxygen vacancy). Center II with an axially symmetric g-tensor with principal values g.sub.|| = 1.955 and g.sub.a[yen] = 1.973 is identified as a Zr.sup.3+ ion. The EPR spectrum of gadolinium activated BaZrO.sub.3 samples exhibit resonance signals with the effective g values at g [approximately equal to] 1.94 and g [approximately equal to] 4.10. The signal at g [approximately equal to] 1.94 has been attributed to Gd.sup.3+ ions disposed in a weak cubic symmetry field between the Gd.sup.3+ ion and the phosphor lattice. The excitation spectrum exhibits a dominant band with a maximum at 275 nm (36364 cm.sup.-1). Upon excitation at 275 nm (36364 cm.sup.-1), the emission spectrum exhibits a well defined ultraviolet B emission band with a maximum at 314 nm (31847 cm.sup.-1) corresponding to.sup.6P.sub.7/2 [right arrow].sup.8S.sub.7/2 transition. Author Affiliation: Department of Chemical Engineering, Konkuk University, Seoul 143-701, Republic of Korea Article History: Received 22 May 2015; Revised 1 July 2015; Accepted 3 July 2015
    Keywords: Gadolinium ; Rare Earth Metal Compounds
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 2
    Language: English
    In: Journal of Alloys and Compounds, Feb 5, 2013, Vol.549, p.238(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2012.09.059 Byline: Raghvendra, Prabhakar Singh, Rajesh Kumar Singh Keywords: Ceramics; Oxide materials; Dielectric response; Grain boundaries; Ion conduction Abstract: a* Dynamics of charge particle is probed using impedance spectroscopic technique. a* Total conductivity shows three different regions with different activation energy. a* Scaling behaviour of the system explains the ion dynamics in these three regions. a* Dielectric relaxation is clearly observed in the dielectric measurement data. a* Structural characterization is done using Raman, FTIR, UV, XRD and SEM techniques. Author Affiliation: Department of Applied Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India Article History: Received 24 July 2012; Revised 11 September 2012; Accepted 13 September 2012
    Keywords: Zirconium -- Electric Properties ; Zirconium Oxide -- Electric Properties
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Journal of Alloys and Compounds, Sept 25, 2015, Vol.644, p.172(8)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2015.04.180 Byline: Devinder Singh, Arun Mahajan Abstract: * Rare earth chromium manganites have been synthesized by sol-gel method. * Upon Nd doping on La site, unit cell volume and the B-O-B bond angle are reduced. * The magnetic interactions are predominantly ferromagnetic. * The Curie temperature decreases with increasing Nd content. * Electric transport behavior can be described by the small polaron hoping model. Article History: Received 16 March 2015; Revised 10 April 2015; Accepted 25 April 2015
    Keywords: Ferromagnetism – Analysis
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 4
    Language: English
    In: Journal of Alloys and Compounds, May 15, 2012, Vol.523, p.30(6)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2012.01.130 Byline: Gurvinderjit Singh, V.S. Tiwari Keywords: Electro-caloric; Relaxor ferroelectric; Antiferroelectrics; Polarization Abstract: a* The electro-caloric (EC) effect in a solid solution of relaxor (lead magnesium niobate: PMN) and anti-ferroelectric (lead zirconate: PZ) has been studied. a* The maximum electro-caloric coefficient ([DELTA]T/E) for this solid solution is [approximately equal to]0.33Kmm/kV. a* At room temperature the electro-caloric coefficient is highest for x =0.30 ([approximately equal to]0.14Kmm/kV) and it is significantly higher than PZT (0.021Kmm/kV). a* A shift in the temperature of electro-caloric maximum ([DELTA]T [approximately equal to]35K) was observed with increase in electric field, for relaxor compositions. a* For ferroelectric composition this shift is much lower ([DELTA]T [approximately equal to]8K). Author Affiliation: Laser Materials Development and Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India Article History: Received 8 November 2011; Revised 4 January 2012; Accepted 24 January 2012
    Keywords: Ceramics
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 5
    Language: English
    In: Journal of Alloys and Compounds, Nov 5, 2015, Vol.648, p.698(8)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2015.06.272 Byline: Paritosh Singh, Hitesh Borkar, B.P. Singh, V.N. Singh, Ashok Kumar Abstract: The integration of inorganic fillers in polymer matrix is useful for superior mechanical strength and functional properties of polymer-ceramic composites. We report the fabrication and characterization of polyvinylidene fluoride-CoFe.sub.2O.sub.4 (PVDF-CFO) (wt% 80:20, respectively) and PVDF-Pb(Zr.sub.0.52Ti.sub.0.48)O.sub.3-CoFe.sub.2O.sub.4 (PVDF-PZT-CFO) (wt% 80:10:10, respectively) free standing 50 [mu]m thick ferroelectric-polymer-ceramic composites films. X-ray diffraction (XRD) patterns and Raman spectra revealed the presence of major semi-crystalline [beta]-PVDF along with [alpha]-phase which is responsible for ferroelectric nature in both the composite systems. Ferroelectric, dielectric and mechanical strength measurements were performed in order to evaluate the effects of CFO and PZT inorganic fillers in PVDF matrix. The inclusion of CFO and PZT micro-/nano-particles in PVDF polymer matrix improved the polarization behavior, dielectric properties and mechanical strength. The energy density was calculated by polarization-electric field hysteresis loop and found in the range of 6-8 J/cm.sup.3 may be useful for microelectronics. Author Affiliation: (a) CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012, India (b) Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory (CSIR-NPL) Campus, Dr. K. S. Krishnan Road, New Delhi, 110012, India Article History: Received 6 April 2015; Revised 29 June 2015; Accepted 30 June 2015
    Keywords: Capacitors – Analysis ; Capacitors – Mechanical Properties ; Electronic Components – Analysis ; Electronic Components – Mechanical Properties ; Electrical Conductivity – Analysis ; Electrical Conductivity – Mechanical Properties ; Raman Spectroscopy – Analysis ; Raman Spectroscopy – Mechanical Properties ; Electronic Components Industry – Analysis ; Electronic Components Industry – Mechanical Properties ; Polyvinylidene Fluoride – Analysis ; Polyvinylidene Fluoride – Mechanical Properties ; Ceramics – Analysis ; Ceramics – Mechanical Properties ; Dielectric Materials – Analysis ; Dielectric Materials – Mechanical Properties
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 6
    Language: English
    In: Journal of Alloys and Compounds, June 15, 2013, Vol.562, p.150(6)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2013.02.034 Byline: Supriya Singh, Pratibha Srivastava, Gurdip Singh Keywords: Metals and alloys; Catalysis; Thermal analysis; X-ray diffraction Abstract: Prepared Co-Ni-Cu ternary nanocrystals were characterized by XRD, EDS, FE-SEM, TEM, HR-TEM and SAED micrographs. The catalytic effect of these nanocrystals was evaluated on the thermal decomposition of ammonium perchlorate using TG and TG-DSC techniques. The kinetics of thermal decomposition of AP was evaluated using isothermal TG data by model fitting as well as isoconversional method. Display Omitted Author Affiliation: Department of Chemistry, DDU Gorakhpur University, Gorakhpur 273 009, India Article History: Received 7 December 2012; Revised 28 January 2013; Accepted 3 February 2013
    Keywords: Alloys -- Chemical Properties ; Alloys -- Analysis ; Cobalt -- Chemical Properties ; Cobalt -- Analysis ; Cobalt Compounds -- Chemical Properties ; Cobalt Compounds -- Analysis
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 7
    Language: English
    In: Journal of Alloys and Compounds, Feb 5, 2014, Vol.585, p.805(6)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2013.09.201 Byline: Hemant Singh, K.L. Yadav Abstract: acents Synthesized nanocomposites of xNiFe.sub.2O.sub.4-(1-x)BiFeO.sub.3 (x = 0.1, 0.2, 0.3, 0.4). acents The average particles size is around 30-70nm. acents Anomaly in dielectric constant is a signature of magnetoelectric coupling ([gamma]). acents [gamma] calculated from fractional change of [DELTA]E[approximately equal to][gamma]M.sup.2 by varying magnetic field. acents Magnetic properties greatly enhanced with increase in nickel ferrite content. Article History: Received 8 July 2013; Revised 23 September 2013; Accepted 29 September 2013
    Keywords: Nanotechnology -- Magnetic Properties ; Nanotechnology -- Methods ; Iron Compounds -- Magnetic Properties ; Iron Compounds -- Methods
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 8
    Language: English
    In: Journal of Alloys and Compounds, Jan 5, Vol.546, p.224(5)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2012.08.105 Byline: D.P. Singh, Gurinder Pal Singh Keywords: X-ray diffraction; Optical properties; FTIR Abstract: a* Fe.sub.2O.sub.3 introduction helps to convert the covalent to ionic behavior of glasses. a* These glasses can be used to make solid state ionic devices. a* Band gap decreases due to presence of Ce.sup.3+, Ce.sup.4+ and BO.sub.4 units. Author Affiliation: Department of Physics, Guru Nanak Dev University, Amritsar 143005, India Article History: Received 3 June 2012; Revised 17 August 2012; Accepted 23 August 2012
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 9
    Language: English
    In: Journal of Alloys and Compounds, April 5, 2012, Vol.519, p.129(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2011.12.137 Byline: Namrata Singh, Nitish Kumar Singh, Devendra Kumar, Om Parkash Keywords: Ceria; Impedance analysis; Ionic conductivity; Solid oxide fuel cells Abstract: a* Single phase formation. a* Variation of ionic conductivity is in accordance with 'Mori Criteria' of effective index. a* No additional enhancement due to co-doping of La and Mg. Author Affiliation: Department of Ceramic Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221005, India Article History: Received 28 November 2011; Revised 27 December 2011; Accepted 27 December 2011
    Keywords: Cerium -- Analysis ; Cerium -- Electric Properties
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 10
    Language: English
    In: Journal of Alloys and Compounds, Feb 5, 2012, Vol.513, p.499(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2011.10.100 Byline: Gurdip Singh, Inder Pal Singh Kapoor, Reena Dubey, Pratibha Srivastava Keywords: Copper oxalate nanocrystals; Ammonium perchlorate; Composite solid propellants; Burning rate; Kinetics Abstract: Prepared copper oxalate nanocrystals were characterized by FE-SEM and bright field TEM micrographs. Its catalytic activity was evaluated on the thermal decomposition of ammonium perchlorate using TG and TG-DSC techniques. Display Omitted Author Affiliation: Department of Chemistry, DDU Gorakhpur University, Gorakhpur 273009, India Article History: Received 1 June 2011; Revised 22 October 2011; Accepted 29 October 2011 Article Note: (footnote) [star] Part 78.
    Keywords: Oxalic Acid ; Oxalates ; Copper (Metal)
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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