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Chinese Physics C> 2014, Vol. 38> Issue(3) : 038001 DOI: 10.1088/1674-1137/38/3/038001

In-situ EXAFS study on the thermal decomposition of TiH2

  • Thermal decomposition behaviors of TiH2 powder under a owing helium atmosphere and in a low vac- uum condition have been studied using an in situ EXAFS technique. By an EXAFS analysis containing the multiple scattering paths including H atoms, the changes of the hydrogen stoichiometric ratio and the phase transformation sequence are obtained. The results demonstrate that the initial decomposition temperature is dependent on experi- mental conditions, which occurs, respectively, at about 300 and 400℃ in a low vacuum condition and under a owing helium atmosphere. During the decomposition process of TiH2 in a low vacuum condition, the sample experiences a phase change process:δ(TiH2)→δ (TiHx)→δ(TiHx)+β(TiHx)→δ(TiHx)+β(TiHx)+α(Ti)→β(TiHx)+α(Ti)→α(Ti)+β(Ti). This study o ers a way to detect the structural information of hydrogen. A detailed discussion about the decomposition process of TiH2 is given in this paper.
      PCAS:
    • 61.05.cj(X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.)

  • References

    [1] Antonov V E, Bashkin I O, Fedotov V K et al. Physical Review B, 2006, 73(5): 6[2] Beeferman D, Lucas W F. United States Patent, vol. 5340012, 1994[3] Dillon A C, Gennett T, Alleman J L et al. Carbon Nanotube Materials for Hydrogen Storage. Proceedings of the 1999 U.S DOE Hydrogen Program Review. NREL/CP-570-26938, 1999[4] JIA F Q, Tsang S C. Fuel, 2006, 85(14-15): 2141[5] Reilly J J, Wiswall R H. Inorganic Chemistry, 1974, 13(1): 218[6] Moon K I, Lee K S. Journal of Alloys and Compounds, 1998, 264: 258[7] Bhosle V, Baburaj E G, Miranova M et al. Materials Science and Engineering A, 2003, 356(1-2): 190[8] Bhosle V, Baburaj E G, Miranova M et al. Metallurgical and Materials Transactions A, 2003, 34: 2793[9] Jiménez C, Garcia-Moreno F, Pfretzschner B et al. Acta Materialia, 2011, 59(16): 6318[10] Jiménez C, Garcia-Moreno F, Rack A et al. Scripta Materialia, 2012, 66(10): 757[11] Lengeler B. Physical Review Letters, 1984, 53(1): 74[12] Yakel H L. Acta Crystallographica, 1958, 11(1): 46[13] LI J, Sheshin G A, Roggatz I et al. Journal of Low Temperature Physics, 1996, 102(1-2): 61[14] Schoenfelder C W, Swisher J H. Journal of Vacuum Science and Technology, 1973, 10(5): 862[15] FRAHM R. Nuclear Instruments and Methods in Physics Research A, 1988, 270: 578[16] Ravel B, Newville M. Journal of Synchrotron Radiation, 2005, 12(Pt 4): 537[17] Rehr J J, Albers R C. Reviews of Modern Physics, 2000, 72(3): 621[18] Alefeld G, Vlkl J. Hydrogen in Metals I. Topics in Applied Physics v 28, Berlin, New York: Springer-Verlag, 1978. 19[19] Numakura H, Koiwa M. Hydride Precipitation in Titanium. Acta Metallurgica, 1984. 32(10): 1799-1807[20] Woo O T, Weatherly G C, Coleman C E et al. Acta Metallurgica, 1985, 33(10): 1897[21] San-Martin A, Manchester F D. Bulletin of Alloy Phase Diagrams, 1987, 8(1): 30[22] XU Q C, Van der Ven A. Physical Review B, 2007, 76(6): 064207[23] Matysina Z A, Shchur D V. Russian Physics Journal, 2001, 44(1): 1237[24] Bashkin I O, Malyshev V Y, Ponyatovsky E G. Zeitschrift Fur Physikalische Chemie, 1993, 179: 119[25] Spreadborough J, Christian J W. Proceedings of the Physical Society of London, 1959, 74(479): 609

  • References

    [1] Antonov V E, Bashkin I O, Fedotov V K et al. Physical Review B, 2006, 73(5): 6[2] Beeferman D, Lucas W F. United States Patent, vol. 5340012, 1994[3] Dillon A C, Gennett T, Alleman J L et al. Carbon Nanotube Materials for Hydrogen Storage. Proceedings of the 1999 U.S DOE Hydrogen Program Review. NREL/CP-570-26938, 1999[4] JIA F Q, Tsang S C. Fuel, 2006, 85(14-15): 2141[5] Reilly J J, Wiswall R H. Inorganic Chemistry, 1974, 13(1): 218[6] Moon K I, Lee K S. Journal of Alloys and Compounds, 1998, 264: 258[7] Bhosle V, Baburaj E G, Miranova M et al. Materials Science and Engineering A, 2003, 356(1-2): 190[8] Bhosle V, Baburaj E G, Miranova M et al. Metallurgical and Materials Transactions A, 2003, 34: 2793[9] Jiménez C, Garcia-Moreno F, Pfretzschner B et al. Acta Materialia, 2011, 59(16): 6318[10] Jiménez C, Garcia-Moreno F, Rack A et al. Scripta Materialia, 2012, 66(10): 757[11] Lengeler B. Physical Review Letters, 1984, 53(1): 74[12] Yakel H L. Acta Crystallographica, 1958, 11(1): 46[13] LI J, Sheshin G A, Roggatz I et al. Journal of Low Temperature Physics, 1996, 102(1-2): 61[14] Schoenfelder C W, Swisher J H. Journal of Vacuum Science and Technology, 1973, 10(5): 862[15] FRAHM R. Nuclear Instruments and Methods in Physics Research A, 1988, 270: 578[16] Ravel B, Newville M. Journal of Synchrotron Radiation, 2005, 12(Pt 4): 537[17] Rehr J J, Albers R C. Reviews of Modern Physics, 2000, 72(3): 621[18] Alefeld G, Vlkl J. Hydrogen in Metals I. Topics in Applied Physics v 28, Berlin, New York: Springer-Verlag, 1978. 19[19] Numakura H, Koiwa M. Hydride Precipitation in Titanium. Acta Metallurgica, 1984. 32(10): 1799-1807[20] Woo O T, Weatherly G C, Coleman C E et al. Acta Metallurgica, 1985, 33(10): 1897[21] San-Martin A, Manchester F D. Bulletin of Alloy Phase Diagrams, 1987, 8(1): 30[22] XU Q C, Van der Ven A. Physical Review B, 2007, 76(6): 064207[23] Matysina Z A, Shchur D V. Russian Physics Journal, 2001, 44(1): 1237[24] Bashkin I O, Malyshev V Y, Ponyatovsky E G. Zeitschrift Fur Physikalische Chemie, 1993, 179: 119[25] Spreadborough J, Christian J W. Proceedings of the Physical Society of London, 1959, 74(479): 609

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ZHOU Ying-Li, ZHENG Li-Rong, CHU Sheng-Qi, WU Min, AN Peng-Fei, ZHANG Jing and HU Tian-Dou. In-situ EXAFS study on the thermal decomposition of TiH2[J]. Chinese Physics C, 2014, 38(3): 038001. doi: 10.1088/1674-1137/38/3/038001
ZHOU Ying-Li, ZHENG Li-Rong, CHU Sheng-Qi, WU Min, AN Peng-Fei, ZHANG Jing and HU Tian-Dou. In-situ EXAFS study on the thermal decomposition of TiH2[J]. Chinese Physics C, 2014, 38(3): 038001.  doi: 10.1088/1674-1137/38/3/038001 shu
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Received: 2013-04-22
Revised: 1900-01-01
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In-situ EXAFS study on the thermal decomposition of TiH2

    Corresponding author: ZHOU Ying-Li,
    Corresponding author: HU Tian-Dou,
  • Received Date: 2013-04-22
  • Accepted Date: 1900-01-01
  • Available Online: 2014-03-05

Abstract: Thermal decomposition behaviors of TiH2 powder under a owing helium atmosphere and in a low vac- uum condition have been studied using an in situ EXAFS technique. By an EXAFS analysis containing the multiple scattering paths including H atoms, the changes of the hydrogen stoichiometric ratio and the phase transformation sequence are obtained. The results demonstrate that the initial decomposition temperature is dependent on experi- mental conditions, which occurs, respectively, at about 300 and 400℃ in a low vacuum condition and under a owing helium atmosphere. During the decomposition process of TiH2 in a low vacuum condition, the sample experiences a phase change process:δ(TiH2)→δ (TiHx)→δ(TiHx)+β(TiHx)→δ(TiHx)+β(TiHx)+α(Ti)→β(TiHx)+α(Ti)→α(Ti)+β(Ti). This study o ers a way to detect the structural information of hydrogen. A detailed discussion about the decomposition process of TiH2 is given in this paper.

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