Thermal conductivity and Lorenz function of gadolinium, terbium, and holmium single crystals

Fabrication of setup for high temperature thermal conductivity measurement

“…Its ferromagnetic-antiferromagnetic transition occurs near room temperature. 14 Our data of gadolinium sample measured from 315 K to 590 K shows increasing behavior. Its thermal conductivity at T =315 K is 7.76 W/m.K, with temperature κ increases and at at T =590 K, its value is 10.9 W/m.K.…”

Transport properties of Gd-Th, Gd-Mg, and Y-Th alloys

“…Both the magnetic properties (40) and transport properties (8,40,41,42) of and c-axis Gd-Th alloys, respectively. The Gd data is given by Nell is (34). The significant effect on the thermal conductivity caused by form ing a disordered alloy by adding an element with a different valence is to sharply reduce the low temperature peak which is present in the pure metal.…”

“…The two thermocouples anchored to the heat sink and inserted at the cold end of the sample were also used to determine the absolute temperature. The thermocouple calibration procedure and the temperature gradient measuring circuit are described by Nell is in his thesis(34).The thermocouple voltage corresponding to the'absolute temperature was measured with a Leeds and Northrup K-3 potentiometer and a Leeds and Northrup model 9834 null detector. The absolute accuracy of the cali bration procedure is about 0.5°K, but the relative accuracy of a tempera ture measurement was 0.1°K.…”

“…shows the c-axis electrical resistivity for the same Gd-Th concentrations as shown inFigure 15. The Gd data is given by Nell is(34) and is again shown for comparison. These curves all have essentially the same shape, but again, the features are not as well pronounced in the alloys as in the pure metal.…”