Speaker
Dr
Chris Benmore
(Argonne National Laboratory)
Description
We present diffraction data that yields the oxygen-oxygen
pair distribution function, g_OO (r), over the range -20 to
+93 deg.C. The running O-O coordination number, which
represents the integral of the pair distribution function as a
function of radial distance, is found to exhibit an isosbestic
point at 3.30(5)Å. The probability of finding an oxygen atom
surrounding another oxygen at this distance is therefore
shown to be independent of temperature and corresponds to
an O-O coordination number of 4.3(2). Moreover, the
experimental data also shows a continuous transition
associated with the second peak position in g_OO (r),
concomitant with the compressibility minimum at 46.5 deg.C.
