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  • 1
    facet.materialart.
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    Magnetic, ferroelectric, and spin phonon coupling studies of Sr3Co2Fe24O41 multiferroic Z-type hexaferrite (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-08-04
    Description: The magnetic, Raman, ferroelectric, and in-field 57 Fe Mössbauer studies of polycrystalline multiferroic Sr 3 Co 2 Fe 24 O 41 are reported in this paper. From the magnetization studies, it is observed that the sample is soft magnetic in nature with low temperature magnetic spin transitions like longitudinal to transverse conical structure around 130 K and change in magnetic crystalline anisotropy from conical to planar structure at 250 K. Ferroelectric studies of the sample exhibit the spontaneous polarization at low temperature. Strong spin phonon and spin lattice coupling is observed through low temperature Raman spectroscopy. From the in-field 57 Fe Mössbauer spectroscopy, spin up and spin down site occupations of Fe ions are calculated in the unit cell.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
    Electronic Resource
    Electronic Resource
    Microprocessor-based boxcar signal averager (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1945-1947 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A boxcar signal averager using Intel 8085AH, an 8-bit microprocessor developed for processing free-induction decay (FID) signals from a pulsed nuclear-magnetic-resonance (NMR) spectrometer, is described. The boxcar signal averager works either in single-point mode or in scan mode. In addition to the software developed, the constructional features, circuit details, and the operation of the boxcar are discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139494
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  • 3
    Electronic Resource
    Electronic Resource
    Cation distribution of Li-Ti mixed ferrites (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6125-6125 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lithium-titanium mixed ferrites of different compositions have been prepared by the well known ceramic technique. Thermo power studies of these samples, after usual characterization by x-ray diffraction (XRD), bulk density, porosity, etc. have been measured by the differential method. Room temperature values of the Seebeck coefficient are found to vary from 2.3 to 114 μV/K. It is an established fact that the thermo power measurement would also be used to study the cation distributions on octahedral and tetrahedral sublattices of ferro spinel. This technique was successfully used in the study of cation distribution of Fe3O4, Fe3O4-TiFe2O4, etc. As such the cation distribution of Li-Ti mixed ferrites of P.I. has been arrived at using thermo-power data by assuming that small polorans rather than electrons/holes are responsible for the process of conduction. A knowledge of cation distribution among octahedral sites of a spinel ferrite is essential to understand the mechanism responsible for electrical properties like electrical conductivity, thermo power, dielectric properties, etc. Saturation magnetization of all the samples has also been obtained by the well known oscillation method. From the cation distribution it has been observed that the concentration of Ti4+ on octahedral sites is found to increase while those of Fe3+ and Fe2+ are found to decrease rapidly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355483
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  • 4
    Electronic Resource
    Electronic Resource
    Theoretical analysis of power generation in gasdynamic lasers (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5231-5237 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The power generation in a gasdynamic laser (GDL) has been theoretically studied. Quasi-one-dimensional unsteady flow equations are numerically solved simultaneously with the rate equation for the laser intensity inside the laser cavity. Steady-state coupled solutions for the field variables and the laser intensity inside the GDL cavity are obtained by a time-dependent numerical technique. The laser intensity variations along the axis of the flow (across the laser cavity) are computed for different laser gas mixture compositions and reservoir conditions. The analysis predicts a sharp spike in the laser intensity at the leading edge of the laser cavity followed by a sharp fall from which it recovers to a uniform constant value for the lower H2O concentrations. It is shown that the H2O concentration above 2% in the CO2-N2-H2O gas mixture is detrimental to the power generation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350232
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  • 5
    Electronic Resource
    Electronic Resource
    Power extraction studies in a gasdynamic laser (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3800-3806 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A generalized two-dimensional flow-radiation coupled model to extract power from a gasdynamic laser is proposed. The model is used for the study of power extraction from a 9.4-μm CO2 downstream-mixing gasdynamic laser, where a cold CO2+H2 stream is mixed with a vibrationally excited N2 stream at the nozzle exits. This model is developed by coupling radiation with the two-dimensional, unsteady, laminar and viscous flow modeling needed for such systems. The analysis showed that the steady-state value of 9.4-μm intensity as high as 5×107 W/m2 can be obtained from the system studied. The role of H2 relaxant in the power extraction process has also been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348481
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  • 6
    Electronic Resource
    Electronic Resource
    Laser-like mechanoluminescence in ZnMnTe-diluted magnetic semiconductor (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 460-462 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser-like mechanoluminescence is reported in the spintronic material ZnMnTe. The luminescence was also observed when the material was exposed to UV and x-rays. Photoluminescence spectra consisted of peaks at 386.5 and 648 nm, which may be attributed to band gap, and Mn2+ levels, respectively. Lattice contraction, sharpness of the x-ray diffraction peak, and the blueshift in the energy gap confirm the nanostructure of the material. A possible mechanism for lasing is also suggested. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1494116
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of a cascade-pumped 16 μm CO2-N2 downstream-mixing gasdynamic laser (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 852-854 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The generation of a 16 μm laser beam through cascading in a downstream-mixing CO2 gasdynamic laser is studied. To simulate actual lasing action, a generalized, two-dimensional, flow-radiation-coupled power extraction model for a gasdynamic laser is used. Also, to model the cascade process a new four-mode CO2-N2 vibrational kinetic model has been proposed. The steady-state intensity obtained for an exclusive 9.4 μm transition is of the order of 5×107 W/m2. In the cascade mode of operation the steady-state intensities for 9.4 and 16 μm transitions of the order of 5×107 W/m2 and 1.0×106 W/m2, respectively, have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103386
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  • 8
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    Enhanced bolometric properties of TiO2−x thin films by thermal annealing (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-07-14
    Description: The effect of thermal annealing on the bolometric properties of TiO 2−x films was investigated. The test-patterned TiO 2−x samples were annealed at 300 °C temperature in order to enhance their structural and electrical properties for effective infrared image sensor device applications. The crystallinity was changed from amorphous to rutile/anatase in annealed TiO 2−x films. Compared to the as-deposited samples, a decrement of the band gap and a decrease of the electrical resistivity were perceived in annealed samples. We found that the annealed samples show linear current-voltage (I−V) characteristic performance, which implies that ohmic contact was well formed at the interface between the TiO 2−x and the Ti electrode. Moreover, the annealed TiO 2−x sample had a significantly low 1/f noise parameter (1.21 × 10 −13 ) with a high bolometric parameter (β) value compared to those of the as-deposited samples. As a result, the thermal annealing process can be used to prepare TiO 2−x film for a high‐performance bolometric device.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 9
    Electronic Resource
    Electronic Resource
    The Baldet–Johnson (B 2Σ+–A 2Πi) system of 13C18O+ (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 1972-1977 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational structure of the 1–0, 0–0, and 0–1 bands of the Baldet–Johnson (B 2Σ+–A 2Πi) system of the molecular ion 13C18O+, excited in the cathode glow of a hollow-cathode discharge tube, was recorded in the spectral region 3700–4225 A(ring) and analyzed. An effective Hamiltonian proposed by Brown et al. [J. M. Brown, E. A. Colbourn, J. K. G. Watson, and F. D. Wayne, J. Mol. Spectrosc. 74, 294 (1979)] was used to obtain the molecular constants from the wave number data of these three bands. These molecular constants were first "merged'' together and the resulting constants were then "merged'' with those of the comet-tail (A 2Πi–X 2Σ+) system of 13C18O+ recently reported by us [C. V. V. Prasad and S. P. Reddy, J. Chem. Phys. 90, 3010 (1989)] to obtain a unique set of constants for the X 2Σ+, A 2Πi, and B 2Σ+ states. Some of the derived constants of 13C18O+ (in cm−1) are for X 2Σ+: Be=1.794 28(4), αe=0.016 61(3), ωe =2110.27(2), and ωexe =13.81(6); for A 2Πi : Be=1.441 92(4), αe=0.016 76(1), ωe =1488.99(2), ωexe =12.454(7), and ωeye =0.0279(8); for B 2Σ+: Be=1.632 62(4), αe=0.025 49(2), ωe=1657.56, and ωexe =27.42.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457647
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of conductance of the Li+, Cs+, and Cl− ions in water: Molecular dynamics simulation (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 7104-7110 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The continuum theory of Hubbard–Onsager predicts for the friction coefficient Δζ (defined as a difference between friction coefficient and the slip Stokes friction coefficient) the following behavior: Δζ〉0 and ∂Δζ/∂T〈0. In case of the Li+ ion in water these predictions are confirmed by experiment. In contrast, experimental observations on Cs+ and Cl− ions in water show that at low temperatures Δζ〈0 and ∂Δζ/∂T〉0. To explain the observed behavior of Δζ(Cs+), the passage through cavities (PTC) mechanism was proposed by Nakahara et al. The molecular dynamics computer simulation technique was used to find out if the PTC mechanism is responsible for the nonclassical behavior of Δζ. No passage through cavities was observed in the computer simulations. Computer simulations were performed on the Li+ ion in water, the Cs+ ion in water, and the Cl− ion in water at temperatures T=268 K and T=298 K. Our results indicate that the observed behavior of Δζ for Li+, Cl−, and Cs+ ions is related to the difference in the reorientation times of water molecules in the ion solvation shell and in the bulk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454360
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