Uttsum


Yagi T and Utsumi W 1993 Direot oonversion of graphite into hexagonal diamond under high pressure New Funct. Mater. C 99  [c.1964]

H. Koyama and K. Utsumi-Oda, / Chem. Soc, Perkin Trans. 2, 1531—1536 (1977).  [c.175]

The most important commercial products of high-pressure science are the extremely hard materials, synthetic diamond [40, 4T and 42] and (c-BN) [43]. At ambient pressure, diamond is less stable than the less dense allotrope, graphite. c-BN also may be less stable than the less dense h-BN isomer with its graphitic stnichire of rings of alternating B and N atoms. Diamond and c-BN with four equivalent sp bonds per atom are denser than graphite and h-BN with tlnee sp bonds, each shorter than an sp bond and one very long intennolecular van der Waals bond per atom. The volume change, AF, for the transfonnations from graphite to diamond is negative. Thus, the A(PF) = PAV contribution to the change of enthalpy or Gibbs free energy is negative and becomes even more negative at higher pressures, so the denser fonns of each material become more stable at higher pressures. Rearranging the bonds around each atom involves high-energy barriers that separate the low and high density fonns (for a historical review of these processes see [44])- Although Yagi and Utsumi [45] showed that the graphite converted to the hexagonal fonn of diamond at  [c.1959]

I. Utsunomiya, M. Fuji, T. Sato and M. Natsume, Chem. Pharm. Bull. 41. 854 (1993).  [c.98]

K. Utsumi, Y. Shimada, and H. Takamizawa, "Monolithic Multicomponent Ceramic (MMC) Substrate," iu K. A. Jackson, R. C. Pohanka, D. R. Ulhmaim, and D. R. Ulrich, eds.. Electronic Packaging Materials Science, Materials Research Society, Pittsburgh, Pa., 1986, pp. 15—26.  [c.316]

Figure 9 SFM image of Langmuir-Blodgett film (top) and associated Fourier transform (bottom). (Courtesy of T. Kato, Utsunomiya UniversKy) Figure 9 SFM image of Langmuir-Blodgett film (top) and associated Fourier transform (bottom). (Courtesy of T. Kato, Utsunomiya UniversKy)
Y. Tobe, N. Utsumi, K. Kawabata, and K. Naemura, Tetrahedron Lett., 37, 9325 (1996).  [c.658]

Mori, Y, K. Hiyikata, and K Utsunomiya, The Effect of Noncondensable Gas on Film Condensation Along a Vertical Plate in an Enclosed Chamber, ASME Journal Heat Trans., V. 99, May (1977) p. 257.  [c.287]


See pages that mention the term Uttsum : [c.289]    [c.18]    [c.483]    [c.288]    [c.351]    [c.466]    [c.468]    [c.8]    [c.59]    [c.163]    [c.163]    [c.188]    [c.328]    [c.100]    [c.404]    [c.163]    [c.285]    [c.123]    [c.253]    [c.1565]    [c.1751]   
Organic syntheses based on name reactions and unnamed reactions (1994) -- [ c.31 , c.34 , c.372 ]