6.6 Three-Phase Regions, Quenched
85
Fig. 6.8 XRD patterns of the
four samples found at the
corners of the three-phase
regions for samples heated in
oxygen and quenched. The
peak indices are indicated
based on JCPDS #89-4619
for the ordered rocksalt phase
and #52-0457 for the layered
phases. The spinel peaks have
the same indices as the
ordered rocksalt; though
there are no (200), (331), and
(422) reflections in the spinel
structures and the (220) peak
is weak. The M-layered
structure is indexed to a
hexagonal structure as
discussed in the text. The
N-layered peaks have the
same indices, though the
(018) and (110) peaks are not
separated
Fig. 6.9 XRD patterns
generated at the four corners
of the three-phase regions
obtained by quenching (left)
and regular cooling (right).
The coordinates are (Li, Mn)
where Li is the lithium metal
fraction and Mn is the
manganese metal fraction
6.6 Three-Phase Regions, Quenched
Figure 6.10 shows a number of XRD scans obtained within the three-phase regions of
quenched samples. The patterns were complex with a number of overlapping peaks.
The whole pattern fits were obtained as linear combinations of the four fits generated