Pnictides and Chalcogenides II: Ternary Lanthanide by W. Suski, T. Palewski (auth.), H.P.J. Wijn (eds.)

By W. Suski, T. Palewski (auth.), H.P.J. Wijn (eds.)

The quantity is a part of the sequence III/27, that covers magnetic homes of non-metallic inorganic compounds in keeping with transition parts. The subvolumes III/27B are to hide the entire lanthanide pnictides and lanthanides chalcogenides. the current quantity 27B5 is split into 3 chapters, each one comprising a survey, figures and tables, and a listing of references. the 1st bankruptcy, facing ternary lanthanide chalcogenides in keeping with transition metals (d-electron elements), keeps the previous subvolume B4. The final bankruptcy comprises the opposite ternary lanthanide chalcogenides, i.e. these according to s-, p- or f-electron parts, in addition to ternary lanthanide pnictides. The intermediate bankruptcy is made of misfit compounds, i.e. ternary lanthanide chalcogenides with a layered crystal structure.

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154. BaLaCuX3. Diffuse reflective VV-visible spectra at RT for (a) BaLaCuS3, (b) BaLaCuSe3, primarily the β phase, and (c) α-BaLaCuSe3 [94C1]. The insert shows the short wavelength details. The reflectivity of BaLaCuS3 displays a sharp decrease around 600 nm that corresponds to the absorption edge. 00(2) eV. The spectra of the two phases of BaLaCuSe3, however, do not show such sharp transitions. There is a structure in the high energy end of all these spectra. Both phases of the selenide have a reflectivity maximum at 330 nm, but there is another maximum at 260 and 300 nm for the β and α phases, respectively.

At high temperatures, above 200 K, ln n/n0 increases linearly with increasing temperature. The activation energy was calculated in the range above 200 K by using the equation N(T) = A exp[–Ea/2kBT], where A is the temperature-independent constant. The activation energy Ea = 16 meV is small, and this value can be explained by the impurity donor level present below the bottom of the conduction band. 0 Fig. 171. BaLa2MnS5. The Hall mobility versus temperature (ln-ln scale) [99M1], T0=1 K, µ0=1 m2V–1s–1.

11i. La2Fe2S5. c. The orthorhombic structure with Cmc2 (SG) projected on the {bc} plane [77B1]. Chains of polyhedra composed of sulphur atoms tetrahedrally or octahedrally coordinating centrally located iron atoms give a monodimensional character to the structure.

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