- Phase equilibria and decomposition of solid solutions in the YbTe–SnTe–PbTe system
-
Phase equilibria in the YbTe–SnTe–PbTe system have been studied using differential thermal analysis, X-ray diffraction, scanning electron microscopy, and emf measurements on YbTe concentration cells. We have mapped out a number of vertical sections, the 400-K isothermal section of the YbTe–SnTe–PbTe phase diagram, and projections of its liquidus and solidus surfaces. The results demonstrate that the system is characterized by the formation of a continuous series of high-temperature solid solutions with a cubic structure (NaCl type), which undergo decomposition below ~1050 K. At room temperature, the YbTe solubility in the Sn1–xPbxTe solid solution system is ~33–35 mol %, whereas the extent of the YbTe-based solid solution series does not exceed 3 mol %.
- Aliev,Ibadova,Imamaliyeva,Yusibov, Yu. A.,Babanly
-
-
Read Online
- Yb-Sn-Te ternary system
-
Phase equilibria in the Yb-Sn-Te ternary system were studied for the first time by physicochemical methods. Phase diagrams were constructed for the Yb-Sn binary subsystem and YbTe-SnTe, YbSn-SnTe, Yb5Sn3-YbTe, YbSn-YbSnTe2
- Aliev,Akhmedova,Ragimova,Azhdarova,Bakhshalieva
-
-
Read Online
- Phase diagram of the YbTe-Sb2Te3-Bi 2Te3 quasi-ternary system
-
The phase equilibria in the YbTe-Sb2Te3-Bi 2Te3 quasi-ternary system were investigated by means of differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscope with energy disper
- Aliev, Ziya S.,Rasulova, Konul D.,Amiraslanov, Imamaddin R.,Tedenac, Jean-Claude,Babanly, Mahammad B.
-
-
Read Online
- Ba2Ln1-xMn2Te5(Ln = Pr, Gd, and Yb; X = Ln vacancy): Syntheses, crystal structures, optical, resistivity, and electronic structure
-
Three new isostructural quaternary tellurides, Ba2Ln1-xMn2Te5 (Ln = Pr, Gd, and Yb), have been synthesized by the molten-flux method at 1273 K. The single-crystal X-ray diffraction studies at 298(2) K showed that Ba2Ln1-xMn2Te5 crystallize in the space group -C2/m of the monoclinic crystal system. There are six unique crystallographic sites in this structure's asymmetric unit: one Ba site, one Ln site, one Mn site, and three Te sites. The Ln site in the Ba2Ln1-xMn2Te5 structure is partially filled, which leaves about one-third of the Ln sites vacant (□) for Pr and Gd compounds. These structures do not contain any homoatomic or metallic bonding and can be charge-balanced as (Ba2+)2(Gd/Pr3+)2/3(Mn2+)2(Te2-)5. The refined composition for the Yb compound is Ba2Yb0.74(1)Mn2Te5 and can be charge-balanced with a mixed valence state of Yb2+/Yb3+. The crystal structures of Ba2Ln1-xMn2Te5 consist of complex layers of 2∞[Ln1-xMn2Te5]4- stacked along the [100] direction, with Ba2+ cations separating these layers. The Ln atoms are bound to six Te atoms that form a distorted octahedral geometry around the central Ln atom. Each Mn atom in this structure is coordinated to four Te atoms in a distorted tetrahedral fashion. These LnTe6 and MnTe4 units are the main building blocks of the Ba2Ln1-xMn2Te5 structure. The optical absorption study performed on a polycrystalline Ba2Gd2/3Mn2Te5 sample reveals a direct bandgap of 1.06(2) eV consistent with the DFT study. A semiconducting behavior was also observed for polycrystalline Ba2Gd2/3Mn2Te5 from the resistivity study. The temperature-dependent magnetic studies on a polycrystalline sample of Ba2Gd2/3Mn2Te5 did not reveal any long-range magnetic order down to 5 K. The effective magnetic moment (μeff) of 10.37μB calculated using the Curie-Weiss law is in good agreement with the theoretical value (μcal) of 10.58μB.
- Panigrahi, Gopabandhu,Jana, Subhendu,Ishtiyak, Mohd,Narayanswamy,Bhattacharjee, Pinaki P.,Ramanujachary,Niranjan, Manish K.,Prakash, Jai
-
supporting information
p. 6688 - 6701
(2021/05/26)
-
- Reduced ternary rare-earth-transition metal tellurides for the smaller rare-earth elements. An exploration and an explanation of the marked stability differentiation among the rare-earth elements in these phases
-
The existence of further metal-rich condensed cluster compounds in R-Z-Te systems has been synthetically explored for R = Sc, Y, Pr, Dy, Er, Tm, Yb, Lu and, mainly, Z = Ru, Rh, Pd, Ag, Ir, Pt, Au. Ten new examples of orthorhombic Er7Ni2/s
- Herzmann, Nina,Gupta, Shalabh,Corbett, John D.
-
p. 848 - 854
(2009/10/09)
-
- THERMODYNAMICS OF VAPORIZATION OF SAMARIUM(II) TELLURIDE AND YTTERBIUM(II) TELLURIDE: A DISCUSSION OF THE THERMOCHEMISTRY OF THE DIVALENT LANTHANOID AND ALKALINE EARTH TELLURIDES.
-
The congruent vaporization of the solid monotellurides of ytterbium and samarium, both of practically stoichiometric composition, was studied over the temperature ranges 1606-1764 and 1732-1922 K, respectively, by the Knudsen effusion weight-loss technique. Using enthalpy and entropy data from the literature for gaseous LnTe, Ln, Te//2, and Te, and estimated data for solid LnTe(Ln equals Yb, Sm) it could be concluded from thermodynamic calculations that within the given temperature ranges-Ln and Te are the principal vapor species and that less than equivalent to 2. 8 and less than equivalent to 0. 9 mol percent of the vapor is present as YbTe and SmTe, respectively.
- Petzel,Ludwigs
-
-