B. Lambertandron et al., THE COEXISTENCE OF 2 PHASES WITH ORDERED AND DISORDERED VACANCIES IN PRGE1.6, Journal of physics. Condensed matter, 6(42), 1994, pp. 8725-8732
The PrGe1.6 compound shows two coexistent crystallographic structures,
which are ordered and disordered variants of the ThSi2 structure, the
ordered phase resulting from the ordering of Ge vacancies. Comparison
is made with CeGe1.6 and Ce and Pr silicides, which exhibit the same
type of phase separation.