Standard enthalpies of formation of some 5d transition metal silicides
by
high temperature direct synthesis calorimetry
Journal of Alloys and Compounds, (1998)Abstract
The standard enthalpies of formation for some 5d transition metal
silicides have been measured by high temperature direct synthesis
calorimetry at 147362 K. The following results in kJ/mole of atoms
are reported: HfSi (270.962.0); Ta Si (238.161.7); TaSi 5 3 2
(246.062.5); WSi (227.362.0); Re Si (212.762.5); Os Si (230.562.1);
IrSi (264.462.6); PtSi (259.662.1); Pt Si (263.362.3). 2 2 2 3 2
In addition to the values for the 5d silicides we are also reporting
results for three additional compounds. These are: LaGe1.6
(275.462.2); Re Ge (2.162.7); OsAl (244.962.2). The results are compared
with some earlier values obtained by calorimetry or 3 7 2
derived from EMF or vapor pressure measurements. They are also compared
with predicted values from the semiempirical model of
Miedema and coworkers and with available enthalpies of formation for
3d and 4d transition metal silicides and with values for 5d
germanides and aluminides. � 1998 Elsevier Science S.A. All rights
reserved.