A differential method for determining the
thermoelectric power of titanium/platinum thermocouples is described. The
results of the differential measurements are compared with data obtained in
direct e.m.f. versus temperature determinations. From the thermoelectric power
results, the temperature dependency of the following properties has been
deduced : (a) the Peltier coefficient of the titanium/platinum couple ; (b) the
difference between the Thomson coefficients of titanium and platinum ; (c) the
absolute thermoelectric power of titanium. It is shown that abrupt changes in
thermoelectric properties accompany the α-β transformation in refined
titanium, the transition temperature range being 883 � 1 to 887 � 2 �C. In a
commercial grade of titanium, the transformation occurs over the range 868 to
970 �C. Some effects due to preferred orientation and the elimination thereof
are also reported.
