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  • AIP Publishing  (58)
  • 2010-2014  (58)
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  • AIP Publishing  (58)
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  • 2010-2014  (58)
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  • 1
    Online Resource
    Online Resource
    An experimental study on SrB4O7:Sm2+ as a pressure sensor
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 113, No. 2 ( 2013-01-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 113, No. 2 ( 2013-01-14)
    Abstract: A pressure sensor of SrB4O7:Sm2+ has been synthesized and the pressure shift of its 7D0-5F0 fluorescence line has been recalibrated at room temperature up to 48 GPa and 127 GPa hydrostatically and non-hydrostatically, respectively. Different from previous study, our results show that the calibrated relation in the quasi-hydrostatic pressure environment is quite different from that in the non-hydrostatic pressure environment. The yield strength of SrB4O7:Sm2+ as a function of the pressure has been determined by the pressure gradient method in a diamond anvil cell. The results show that the yield strength of SrB4O7:Sm2+ increases from 2.85 GPa at a pressure of 7.9 GPa to 4.22 GPa at 25.4 GPa and is much smaller than that of ruby. The relatively small high-pressure yield strength of SrB4O7:Sm2+ is at the same level of the most sample materials. This would result in a small pressure difference with the coexisting sample, thus lead to a small error in the pressure measurement. The smaller yield strength and excellent fluorescent spectral characters of SrB4O7:Sm2+ make it a good substitute for ruby as a pressure scale in high-pressure experiments, especially under non-hydrostatic pressure environments.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4774113
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    A new model for optimization of organic light-emitting device by concurrent incorporation of electrical and optical simulations
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 112, No. 8 ( 2012-10-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 112, No. 8 ( 2012-10-15)
    Abstract: To optimize the performance of organic light-emission devices (OLEDs), optical simulation or electrical simulation is often used to help designing the device structures. However, employing electrical or optical simulation separately to optimize the device might lead to incorrect conclusions. A few researches have combined optical and electrical simulations to design OLED structures by merely inserting the maximum carrier recombination rate calculated from electrical simulation into optical simulation programs, which is still insufficient for optimization of OLEDs due to lack of considering the influence of optical interference positions. In this paper, we investigate the OLED performance by using three simulation methods, pure optical, pure electrical, or combination of both, to design the devices. Using the models incorporating both electrical and optical simulations, we found that the optimal emission position occurs neither at the place with the best optical interference nor at the point where carrier recombination rate is the maximum. In order to verify the simulation results, we design the testing devices, red fluorescence OLEDs of bi-layer structures, with various positions of recombination emission. It is found that the position of recombination emission has major impact on the device performance of OLEDs, which lead to some important design rules. With integration of electrical and optical simulations, the real emission position could be predicted with excellent agreements to the experimental results. Applying this method to design the red fluorescent bi-layer OLEDs, the device with very high efficiency of 8.44 cd/A was achieved.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4759257
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Short-range and medium-range order in Ca7Mg3 metallic glass
    AIP Publishing ; 2010
    In:  Journal of Applied Physics Vol. 107, No. 8 ( 2010-04-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 107, No. 8 ( 2010-04-15)
    Abstract: A molecular dynamics simulation has been performed on the rapid quenching processes of Ca7Mg3 alloy including 100 000 atoms. The structures of short-range order (SRO) and medium-range order (MRO) in Ca7Mg3 metallic glass are investigated by means of several structural analysis methods. It is found that the SRO in Ca7Mg3 metallic glass can be modeled by neither a uniquely prescribed stereo-chemical structure nor five Bernal polyhedra but rather various types of basic clusters in which the icosahedron is dominant. The local energy together with the geometrical constraint plays very important roles in the favorable local structure in metal glasses. The MRO in Ca7Mg3 metallic glass is characterized by certain types of extended icosahedral clusters combined by intercross-sharing atoms in the form of chains or dendrites, which is different from the fcc or icosahedral building schemes for the MRO in metallic glasses with significant chemical SRO. The size distributions of these MRO clusters present a magic number sequence of 19, 23, 25, 27, 29, 31, 33, 35, 37, 41, 43,…, and the magic clusters can be classed into three types according to their compactness.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3357304
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    CO2 Pressure Shift and Broadening of Water Lines Near 790 nm
    AIP Publishing ; 2014
    In:  Chinese Journal of Chemical Physics Vol. 27, No. 1 ( 2014-02-27), p. 1-4
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 27, No. 1 ( 2014-02-27), p. 1-4
    Abstract: Carbon dioxide pressure-broadened ro-vibrational transitions belonging to the v2+3v3 band of H216O have been measured with a sensitive cavity ring-down spectrometer. Water vapor of relatively low pressures ( & lt;0.5 Torr) was used to limit the self-collisions among water molecules. After the calibration using the precise atomic transitions of Rb and a thermostabilized Fabry-Pérot interferometer, 10−5 cm−1 frequency accuracy has been achieved. Line parameters are derived from least-squares fitting of the spectra using the “soft” collision model. The retrieved line parameters can be applied in the study of water absorption in the CO2-rich atmospheres of planets like Venus and Mars.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/27/01/1-4
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 5
    Online Resource
    Online Resource
    Infrared Spectroscopy of CO Isolated in Solid Nitrogen Matrix
    AIP Publishing ; 2014
    In:  Chinese Journal of Chemical Physics Vol. 27, No. 1 ( 2014-02-27), p. 5-8
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 27, No. 1 ( 2014-02-27), p. 5-8
    Abstract: The infrared absorption spectra of the CO monomer isolated in solid N2 have been recorded at various temperatures between 4.5 and 30 K. The absorption features of the fundamental stretching mode show its linewidth and matrix-induced frequency shift to be weakly temperature-dependent. As the temperature of the matrix was raised, an increase in the linewidth together with a redshift in the central frequency was observed. These observations were explained in terms of the quenching of the CO rotational states by the N2 matrix into closely-lying librational states. A quantitative model was then used to calculate the energy difference between these librational states. Results show that they can be thermally populated through the absorption of matrix phonons.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/27/01/5-8
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 6
    Online Resource
    Online Resource
    Extensive Computational Study on Conformations of Microsolvated Leucine Complexes
    AIP Publishing ; 2012
    In:  Chinese Journal of Chemical Physics Vol. 25, No. 4 ( 2012-08-01), p. 409-418
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 25, No. 4 ( 2012-08-01), p. 409-418
    Abstract: The conformations for leucine (Leu) hydrated with one to three water molecules, Leu-(H2O)n(n=1–3), were carefully searched by considering the trial structures generated by all possible combinations of rotamers of Leu combined with all likely hydration modes. The structures were optimized at the BHandHLYP/6-31+G* level and the single point energies were calculated at the BHandHLYP/6-311++G** level. Good correspondence between the conformations of Leu-(H2O)n and bare Leu is found, showing that the conformations of Leu-(H2O)n may be efficiently and reliably determined by the hydration of Leu conformers. The simulated IR spectra of canonical and zwitterionic conformers of Leu-(H2O)n are compared with the experimental result of Leu in aqueous solution. The IR spectrum of zwitterionic Leu-(H2O)3 provides the best description of the experiment. The result demonstrates that the IR spectrum of solute in solution may be simulated by the solute hydrated with an adequate number of water molecules in the gas phase.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/25/04/409-418
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 7
    Online Resource
    Online Resource
    Observation on asymmetric magnetization reversal in exchange-biased egg-shaped nanoparticles
    AIP Publishing ; 2010
    In:  Journal of Applied Physics Vol. 108, No. 3 ( 2010-08-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 108, No. 3 ( 2010-08-01)
    Abstract: For an egg-shaped nanoparticle model consisting of an antiferromagnetic (AFM) core and a ferromagnetic shell, Monte Carlo methods with a modified Metropolis algorithm are performed. We unambiguously demonstrate the dependence of exchange bias (EB) and magnetization reversal mechanism on cooling field, radius, and position of AFM core by observing the microscopic spin configurations and the microscopic spin energy distributions. The results show that the influence factors for EB and magnetization reversal mechanism are different. The effects of cooling field and radius of AFM core on EB are strong. However, the magnetization reversal mechanism is influenced strongly by the radius and position of AFM core. This work will stimulate further theoretical and experimental investigations of the relation between EB and magnetization reversal mechanism.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3452332
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    Electronic structure and transport properties of single and double filled CoSb3 with atoms Ba, Yb and In
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 109, No. 11 ( 2011-06-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 109, No. 11 ( 2011-06-01)
    Abstract: We report an investigation of the electronic structures and electrical transport properties of the single-filled and double-filled CoSb3 skutterudites with Ba, Yb and In atoms by density functional calculations and Boltzmann transport theory. The band structure and the density of states of single and double filled CoSb3 are calculated and discussed. Based on the results of the band structure, the temperature dependence of Seebeck coefficients, the electrical conductivity, the power factor and the carrier concentration are computed, which are generally in good agreement with the experimental data. The results indicate that the combination of (Ba, In) could greatly improve the thermoelectric properties while the combination of (In, Yb) and (Ba, Yb) would have negative effect on the power factors, due to the fact that the interaction of Yb atoms with CoSb3 would result in a reduction of the electron mobility.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3596811
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 9
    Online Resource
    Online Resource
    Electromechanical responses of Cu strips
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 113, No. 18 ( 2013-05-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 113, No. 18 ( 2013-05-14)
    Abstract: Electrical-thermal-mechanical behavior of materials plays an important role in controlling the structural integrity of electromechanical structures of small volumes. The electromechanical response of Cu strips was studied by passing an electric current through the strips with electric current densities in the range of 12.34 to 29.60 kA/cm2. The passage of the electric current of high current densities introduced electrical-thermal-mechanical interactions, which caused grain growth and grain rotation in both the melted region and heat-affected zone. The electrothermal interactions led to the elastoplastic buckling of the Cu strips with the maximum deflection of the Cu strips increasing with the increase of the electric current density. The total strain is a quadratic function of the electric current density. There was a quasi-steady state in which the electric resistance of the Cu strips linearly increased with time before the occurrence of electric fusing. A power-law relation was used to describe the dependence of the time-to-failure (electric fusing) on the electric current density. For the region of relatively low current densities, the current exponent ranged from 17.9 to 44.6, and for the region of high current densities, the current exponent ranged from 2.5 to 5.2. The current exponent for relatively low current densities decreased with increasing the length of Cu strips, showing size-dependence. Finite element analyses were performed to analyze the current-induced deflection of a Cu strip. The simulation results showed that the maximum deflection for the electric current density larger than or equal to 5 kA/cm2 is a linear function of the current density in agreement with the experimental observation.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4804938
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 10
    Online Resource
    Online Resource
    Exchange bias and its propagation in ferromagnetic/antiferromagnetic/ferromagnetic trilayers
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 114, No. 15 ( 2013-10-21)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 114, No. 15 ( 2013-10-21)
    Abstract: We establish a simple ferromagnetic/antiferromagnetic/ferromagnetic trilayer model, where the lower-interface coupling is varied and study its combined effect with cooling field or temperature on the upper-interface exchange bias effect. Exchange bias field is almost independent of cooling field, if the lower-interface coupling is ferromagnetic and large. Otherwise, its value becomes sensitive to cooling field, and the evolution trend of exchange bias with increasing cooling field depends on the sign and strength of lower-interface coupling. On the other hand, the blocking temperature, below which exchange bias emerges, is reduced (or elevated) in the trilayers with a large ferromagnetic (or antiferromagnetic) lower-interface coupling. The numerical results obtained are interpreted well in terms of the magnetization behaviors in the respective layers. A cooling field creates a low-temperature frozen configuration in the antiferromagnetic layer after cooling to generate exchange bias, while such a configuration related to exchange bias and blocking temperature may be rearranged due to existence of the second ferromagnetic layer on the backside of the antiferromagnetic layer. This work provides an insight into the exchange bias effect and its propagation in such a trilayer stack employing a rather thin antiferromagnetic layer.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4824752
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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