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Title: Temperature-dependent structure evolution in liquid gallium

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1420023
Grant/Contract Number:
ED-AC02-07CH11358
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 128; Journal Issue: C; Related Information: CHORUS Timestamp: 2018-02-09 12:18:04; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Xiong, L. H., Wang, X. D., Yu, Q., Zhang, H., Zhang, F., Sun, Y., Cao, Q. P., Xie, H. L., Xiao, T. Q., Zhang, D. X., Wang, C. Z., Ho, K. M., Ren, Y., and Jiang, J. Z. Temperature-dependent structure evolution in liquid gallium. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.02.038.
Xiong, L. H., Wang, X. D., Yu, Q., Zhang, H., Zhang, F., Sun, Y., Cao, Q. P., Xie, H. L., Xiao, T. Q., Zhang, D. X., Wang, C. Z., Ho, K. M., Ren, Y., & Jiang, J. Z. Temperature-dependent structure evolution in liquid gallium. United States. doi:10.1016/j.actamat.2017.02.038.
Xiong, L. H., Wang, X. D., Yu, Q., Zhang, H., Zhang, F., Sun, Y., Cao, Q. P., Xie, H. L., Xiao, T. Q., Zhang, D. X., Wang, C. Z., Ho, K. M., Ren, Y., and Jiang, J. Z. Sat . "Temperature-dependent structure evolution in liquid gallium". United States. doi:10.1016/j.actamat.2017.02.038.
@article{osti_1420023,
title = {Temperature-dependent structure evolution in liquid gallium},
author = {Xiong, L. H. and Wang, X. D. and Yu, Q. and Zhang, H. and Zhang, F. and Sun, Y. and Cao, Q. P. and Xie, H. L. and Xiao, T. Q. and Zhang, D. X. and Wang, C. Z. and Ho, K. M. and Ren, Y. and Jiang, J. Z.},
abstractNote = {},
doi = {10.1016/j.actamat.2017.02.038},
journal = {Acta Materialia},
number = C,
volume = 128,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.actamat.2017.02.038

Citation Metrics:
Cited by: 6works
Citation information provided by
Web of Science

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  • Temperature-dependent atomistic structure evolution of liquid gallium (Ga) has been investigated by using in situ high energy X-ray diffraction experiment and ab initio molecular dynamics simulation. Both experimental and theoretical results reveal the existence of a liquid structural change around 1000 K in liquid Ga. Below and above this temperature the liquid exhibits differences in activation energy for selfdiffusion, temperature-dependent heat capacity, coordination numbers, density, viscosity, electric resistivity and thermoelectric power, which are reflected from structural changes of the bond-orientational order parameter Q6, fraction of covalent dimers, averaged string length and local atomic packing. This finding will trigger more studiesmore » on the liquid-to-liquid crossover in metallic melts.« less
  • Near edge x-ray absorption fine structure (NEXAFS) spectroscopy has been employed to obtain the temperature dependent evolution of the electronic structure of acid treated carbon nanotubes, which were further modified by dielectric barrier discharge plasma processing in an ammonia atmosphere. The NEXAFS studies were performed from room temperature up to 900 deg. C. The presence of oxygen and nitrogen containing functional groups was observed in C K edge, N K edge, and O K edge NEXAFS spectra of the multiwalled carbon nanotubes. The N K edge spectra revealed three types of {pi}* features, the source of which was decisively identifiedmore » by their temperature dependent evolution. It was established that these features are attributed to pyridinelike, NO, and graphitelike structures, respectively. The O K edge indicated that both carbonyl (C=O), {pi}*(CO), and ether C-O-C, {sigma}*(CO), functionalities were present. Upon heating in a vacuum to 900 deg. C the {pi}*(CO) resonances disappeared while the {sigma}*(CO) resonances were still present confirming their higher thermal stability. Heating did not produce a significant change in the {pi}* feature of the C K edge spectrum indicating that the tabular structure of the nanotubes is essentially preserved following the thermal decomposition of the functional groups on the nanotube surface.« less
  • We have studied the temperature-dependent evolution of the electronic and local atomic structure in the cubic colossal magnetoresistive manganite La{sub 1-x}Sr{sub x}MnO{sub 3} (x= 0.3-0.4) with core and valence level photoemission (PE), x-ray absorption spectroscopy (XAS), x-ray emission spectroscopy (XES), resonant inelastic x-ray scattering (RIXS), extended x-ray absorption fine structure (EXAFS) spectroscopy and magnetometry. As the temperature is varied across the Curie temperature T{sub c}, our PE experiments reveal a dramatic change of the electronic structure involving an increase in the Mn spin moment from {approx} 3 {micro}B to {approx} 4 {micro}B, and a modification of the local chemical environmentmore » of the other constituent atoms indicative of electron localization on the Mn atom. These effects are reversible and exhibit a slow-timescale {approx}200 K-wide hysteresis centered at T{sub c}. Based upon the probing depths accessed in our PE measurements, these effects seem to survive for at least 35-50 {angstrom} inward from the surface, while other consistent signatures for this modification of the electronic structure are revealed by more bulk sensitive spectroscopies like XAS and XES/RIXS. We interpret these effects as spectroscopic fingerprints for polaron formation, consistent with the presence of local Jahn-Teller distortions of the MnO{sub 6} octahedra around the Mn atom, as revealed by the EXAFS data. Magnetic susceptibility measurements in addition show typical signatures of ferro-magnetic clusters formation well above the Curie temperature.« less
  • Cited by 6
  • The luminescent lifetime of cerium-doped yttrium aluminum garnet has been determined as a function of temperature and as a function of gallium content. We have shown that increasing gallium content decreases the decay lifetime and results in luminescence quenching at lower temperatures. The results are quantitatively explained using a configurational coordinate diagram.