Pressure dependencies of thermoelectric power of the lanthanides: (a) lanthanum (from Ref. 42), (b) cerium, (c) praseodymium, (d) neodymium, (e) samarium, (f) gadolinium, (g) terbium, (h) dysprosium, (i) holmium, (j) erbium, and (k) ytterbium. The dependences were obtained for the first pressurization cycle. The dashed rectangles schematically show the stability regions of different phases, summarized in Table I. The numbers 1-5 label data taken from the literature: 1—Ref. 68, 2—Ref. 72, 3—Ref. 70, 4—Ref. 38, and 5—Ref. 35.
Examples of dependencies of thermoelectric signal U on applied temperature difference ΔT between sample edges. A thermopower value S is found as an inverted linear coefficient between them: S = –U/ΔT. Thermopower values found by this method (fixed pressure and variable temperature difference ΔT) well agree with those presented in Fig. 1 obtained by pressure variation at fixed ΔT. Notice that Figs. 1 and 2 show representative data for different experimental runs and different samples of the same element, and hence some minor divergences between Figs. 1 and 2 are possible.
Examples of evolution of pressure dependencies of thermoelectric power of the lanthanides under pressure cycling: (a) samarium, (b) terbium, and (c) holmium. The numbers 1-2 and the dashed rectangles correspond to those in Fig. 1. Cycle numbers are given near the curves. Directions of pressure variation are shown by arrows.
Structural and thermoelectric properties of the lanthanides in the pressure range below 20 GPa.
Article metrics loading...
Full text loading...