Polarization measurements have been made on CaF2 using cells of the type Ca-Pb(1) I CaF2(s) I Fe(s) (D Xca ----0.9 and Fe(s) I CaF2(s) i Ca-Bi(1) (II) XCa --0.25 * Electrochemical Society Active Member.
An apparatus is described which is suitable to study fused chlorides by the polarographic technique. Dropping bismuth is used in a way analogous to dropping mercury. Polarographic waves are shown for
PbCl2
,
ZnCl2
, and
CdCl2
in a
normalLiCl‐normalKCl
eutectic melt at 450°C. The method serves as an analytical tool at high temperatures, besides yielding physicochemical information such as diffusion coefficients by application of the Ilkovic equation.
The electronic conductivity of molten NaC1-Na solutions was determined as a function of the activity of Na at 850 ~ and 900~ by using the Wagner polarization technique. A transient technique was used to determine the diffusion coefficient and the mobility of electrons. A thermodynamic defect model was applied for calculating the concentration of defects as a function of the activity of Na in NaC1.Recent in situ investigations of surface states on semiconductors immersed in an electrolyte have centered on capacitance-voltage (1-4), conductance-voltage (1, 2), modulated and steady-state photocurrents (5, 6) as well as electroreflectance (7-10). We have concentrated on the first two techniques in an initial study of induced surface states on tungsten diselenide which, to the authors' knowledge, has not been done previously.WSe2 is one of the semiconducting members of the transition metal dichalcogenide family. The metal atoms are in hexagonally packed planes that are sandwiched between chalcogen layers. Strong covalent bonds within a sandwich alternate with weak, van der Waals type bonds between sandwiches. Surfaces relatively free of defects, i.e., steps and dangling bonds, can therefore be prepared by simply peeling away successive sandwiches with sticky
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