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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Applications of experimental mineralogy to Te containing systems: Crystal structures, phase relations
 Laufek, František ; Rieder, Milan (advisor) ; Palatinus, Lukáš (referee) ; Johan, Zdeněk (referee)
This dissertation contributes to the crystal chemistry of Te. The primary goals of the thesis are synthesis and crystal structure analysis of new Te-bearing ternary phases. The first part of the thesis shows significance of experimental mineralogy in research of Te containing systems. It briefly describes a novel approach to the study of new mineral species - the possibility of using synthetic analogues for their detailed mineralogical characterization. The results of the experimental mineralogical study in the Ni-Sb-Te ternary system at 400řC are reported in the second part. According to the performed experiments, two solid solutions λ1- Ni(Sb1-xTex)1+y (0<x<1, where 109.09.0 ≤≤⇒≥≈∀ yx ) and λ2 - NiSb1-xTe2x (0.28<x<0.66) dominate the system at 400řC. A characteristic feature of most phases present in the Ni-Sb-Te system at 400řC is apparent tendency to the Sb - Te substitution. The third part deals with the characterisation of the new mineral pašavaite Pd3Pb2Te2, which was found at the Noril'sk-Talnakh Ni-Cu camp, Russia. The synthetic Pd3Pb2Te2 phase was used for thorough mineralogical characterization of this new mineral species. Pašavaite displays orthorhombic symmetry, space group Pmmn. The structural identity between natural grains and synthetic Pd3Pb2Te was supported by the EBSD study. The...
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Preparation of Cu3(Si0.5Ge0.5) Nanoplatelets
 Dřínek, Vladislav ; Fajgar, Radek ; Palatinus, Lukáš ; Klementová, Mariana ; Novotný, F.
The nanoplatelets possess composition corresponding to Cu3(Si0.5Ge0.5). The 3D collection of electron diffraction patterns has shown that the rooom-temperature structure of the nanoplatelets corresponds to the ?-Cu3Si phase. Evaluation of the diffraction pattern shows that the structure has trigonal symmetry with long period incommensurate modulation. it can be approximately described in a 36-fold superstructure with trigonal unit cell and cell dimensions a=b=16.1A6, c=21.8A6.
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