Fig. 3. m-XRD patterns from (a) LaPO4, (b) YbPO4, (c) La0.7Yb0.3PO4, and (d) La0.3Yb0.7PO4 materials implanted with three different doses of Au ions (1 1014, 5 1014, and
1 1015 ions/cm2
) are shown. Bulk powder XRD patterns from the as-synthesized materials are also shown. The dot symbol in (b) indicates the presence of an anomalous peak. The
peak labelled with an asterisk symbol in (d) arises from both the monazite phase [(0 1 2) peak] and unreacted Yb2O3 [(2 2 2) peak]. Diffraction peaks from the impurity phase,
Yb2O3, observed in the pattern from YbPO4 and La0.3Yb0.7PO4 are represented by a diamond symbol.