C. Huhnt et al., FIRST-ORDER AND 2ND-ORDER PHASE-TRANSITIONS IN TERNARY EUROPIUM PHOSPHIDES WITH THCR2SI2-TYPE STRUCTURE, Physica. B, Condensed matter, 252(1-2), 1998, pp. 44-54
The ThCr2Si2- type compounds EuFe2P2 and EuRu2P2 exhibit as a function
of pressure continuous phase transitions which are accompanied by ext
remely strong changes of the lattice parameters and particularly of th
e P-P distance d(P-P) along the tetragonal c-axis. In the isostructura
l integralvalent LaT2P2 compounds similar phase transitions of second
(T = Fe) and first order (T = Co) occur as a Function of pressure indi
cating that the T element essentially determines the nature of the pha
se transition. The different types of phase transitions are explained
phenomenologically. (C) 1998 Elsevier Science B.V, All rights reserved
.