Hw. Zandbergen et al., THE STRUCTURE OF THE 21-K SUPERCONDUCTOR THPDXB6-2X, X=0.65, DETERMINED BY QUANTITATIVE ELECTRON-DIFFRACTION AND THROUGH-FOCUS ELECTRON HOLOGRAPHY, Philosophical magazine letters, 71(2), 1995, pp. 131-138
Through-focus electron holography and quantitative electron diffractio
n have been applied to determine the structure of the 21 K superconduc
tor ThPd(x)B6-2x with xalmost-equal-to0.65. This compound adopts a cub
ic structure (a = 0.42 nm; space group, Pm3BARm), which is an intermed
iate between the structures of the CaB6 and Cu3Au. Short-range orderin
g results in a superstructure as is evident from diffuse streaks in th
e electron diffraction pattern.