Open AccessAN EXAFS STUDY OF THE STRUCTURAL MORPHOLOGY OF Ni IN SYNTHETIC DIAMOND
Author(s) -
Chenxi Li,
Lu Kun-Quan,
Yaqin Zhao,
Shen Zhu-Tong
Publication year - 1990
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.39.19
Subject(s) - extended x ray absorption fine structure , materials science , diamond , metal , synthetic diamond , impurity , transition metal , carbon fibers , nickel , crystallography , catalysis , metallurgy , absorption spectroscopy , composite material , chemistry , composite number , optics , physics , organic chemistry , biochemistry
The structral morphology of metal catalyst Ni in the synthetic diamond was measured by using the fluorecence EXAFS technique. The nickle impurities found exist as fee structure, which is similar to the pure metal Ni. The results obtained from the amount of C atoms coordinated surround Ni and the dilation of Ni-Ni distance show about 9 at-% carbon in the metal Ni matrix which is much more than the limit of earbon solubility 2.7 at-% in metal Ni at normal pressure. The coordination number of Ni in diamond found is less than that in pure metal. This shows that the nickle in the diamond distributes as small particles with dimension about 20?.