Materials Transactions Online

Materials Transactions, Vol.46 No.08 (2005) pp.1798-1801
© 2005 The Japan Institute of Metals

High-Pressure Synthesis of Novel Hydrides in Mg--TM Systems (TM = Zr, Nb and Mo)

Yasuyuki Goto, Takayuki Hayashi, Riki Kataoka, Hirofumi Kakuta, Atsunori Kamegawa, Hitoshi Takamura and Masuo Okada

Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

New hydrides of Mg--TM--H systems, where TM = Zr, Nb and Mo, have been prepared by using cubic-anvil-type apparatus, and their crystal structure and hydrogen content have been investigated. The high-pressure synthesis was performed at 1073--1173 K under 2--5 GPa. In the Mg--Zr--H system, a new hydride Mg2Zr3Hy with a monoclinic structure (a = 0.8591(1) nm, b = 0.33539(5) nm, c = 0.5816(1) nm, β = 103.06(3)°) was obtained by exposing a mixture of MgH2 and ZrH2 to pressure of 2 to 5 GPa at 1073 K for 2 h. In the Mg--Mo system, a new hydride Mg3MoH6 was synthesized by exposing a mixture of MgH2 and Mo to 5 GPa at 1173 K for 2 h. The hydride was found to have a hexagonal structure (a = 0.49958(6) nm, c = 0.8840(2) nm). In the Mg--Nb--H system, a new hydride Mg4NbHy was also synthesized by exposing a mixture of MgH2 and Nb to 5 GPa at 1073 K for 2 h.

(Received 2005/4/26; Accepted 2005/7/28; Published 2005/8/15)

Keywords: high pressure synthesis, new hydride, Magnesium--Molybdenum--Hydrogen system, Magnesium--Niobium--Hydrogen system, X-ray diffraction

PDF(Free)PDF (Free) Table of ContentsTable of Contents

REFERENCES

  1. B. Huang and K. Yvon: J. Alloys Compd. 197 (1993) 97--99.
  2. W. Bronger, K. Jansen and K. Yvon: J. Alloys Compd. 199 (1993) 47--51.
  3. M. Bortz, B. Bertheville, K. Yvon, E. A. Movlaev, V. N. Verbetsky and F. Fauth: J. Alloys Compd. 279 (1998) L8--L10.
  4. H. Blomqvist, E. R"onnebro, D. Kyoi, T. Sakai and D. Nor'eus: J. Alloys Compd. 358 (2003) 82.
  5. D. Kyoi, E. R"onnebro, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama and T. Sakai: J. Alloys Compd. 361 (2003) 252--256.
  6. D. Kyoi, T. Sato, E. R"onnebro, Y. Tsuji, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Nor'eus and T. Sakai: J. Alloys Compd. 375 (2004) 253--258.
  7. D. Kyoi, T. Sato, E. R"onnebro, N. Kitamura, A. Ueda, M. Ito, S. Katsuyama, S. Hara, D. Nor'eus and T. Sakai: J. Alloys Compd. 372 (2004) 213--217.
  8. H. Takamura, H. Kakuta, A. Kamegawa and M. Okada: J. Alloys Compd. 330--332 (2002) 157--161.
  9. H. Kakuta, A. Kamegawa, H. Takamura and M. Okada: Mater. Sci. Forum 350--351 (2000) 329--332.
  10. H. Kakuta, T. Miyashita, Y. Goto, A. Kamegawa, H. Takamura and M. Okada: Mater. Trans. 42 (2001) 443--445.
  11. H. Takamura, H. Kakuta, Y. Goto, A. Kamegawa and M. Okada: Mater. Trans. 42 (2001) 1301--1304.
  12. Y. Goto, H. Kakuta, A. Kamegawa, H. Takamura and M. Okada: Mater. Trans. 42 (2001) 1850--1853.
  13. Y. Goto, H. Kakuta, A. Kamegawa, H. Takamura and M. Okada: PRICM4, JIM (2001) 1219--1222.
  14. Y. Goto, A. Kamegawa, H. Takamura and M. Okada: Mater. Trans. 43 (2002) 2717--2720.
  15. H. Takamura, Y. Goto, A. Kamegawa and M. Okada: Mater. Trans. 44 (2003) 583--588.
  16. Y. Goto, H. Kakuta, A. Kamegawa, H. Takamura and M. Okada: Sci. Tech. Adv. Mater. 4 (2003) 333--338.
  17. H. Takamura, Y. Goto, A. Kamegawa and M. Okada: Mater. Sci. Forum 419--422 (2003), 983--988.
  18. Y. Goto, H. Kakuta, A. Kamegawa, H. Takamura and M. Okada: Mater. Sci. Forum 475--479 (2004) 2521--2526.
  19. H. Watanabe, Y. Goto, H. Kakuta, A. Kamegawa, H. Takamura and M. Okada: Mater. Trans. 45 (2004) 1350--1354.
  20. C. X. Shang, M. Bououdina, Y. Song and Z. X. Guo: Inter. J. Hydrogen. Energy 29 (2004) 73--80.


[JIM HOME] [JOURNAL ARCHIVES]

© 2002 The Japan Institute of Metals
Comments to us : editjt@jim.or.jp