Mar'yana Lukachuk

Max Planck Institute for Solid State Research, Stuttgart, Baden-Württemberg, Germany

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Publications (6)11.51 Total impact

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    ABSTRACT: The title compound was synthesized from Gd, GdI 3 and Zn under Ar atmosphere at 850 degrees C. It crystallizes in the space group R3 (No. 148) with lattice constants a=15.686(1) A and c=10.4882(8) A. The structure features isolated Zn-centered Gd 6 octahedra with all edges and corners capped by I atoms. The disorder of the Gd atoms is rationalized via electron microscopic techniques. A computational analysis using the extended Hückel method has been carried out in order to understand the bonding of this compound. The structure of isotypic La 7I12Co is also remarked (a=16.040(1) A and c=10.905(2) A).
    Inorganic Chemistry 07/2008; 47(11):4656-60. · 4.59 Impact Factor
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 01/2008; 39(37).
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    ABSTRACT: Two new layered rare earth boride halides, La2XB3 (X = Cl, Br) have been synthesized. They crystallize in the space group (No. 174) with a = 7.872(1) Å, c = 8.219(2) Å, V = 441.1(1) Å3 for the chloride, and with a = 7.834(1) Å, c = 8.440(1) Å, V = 448.6(1) Å3 for the bromide compound, respectively. The crystals of La2ClB3 are twinned resulting in an apparent symmetry P6/mmm (No. 191). In the crystal structure of La2XB3, trigonal La6 prisms are condensed into sheets in the a-b plane, and the halogen atoms X sandwich the La double layers. The connection of B atoms which center the prisms and rectangular prism faces leads to B nets of B3, B6 and B8 rings embedded between the La atom double layers. The chemical bonding is analyzed for the well ordered bromide, and the characteristic disorder in the chloride is discussed.
    Zeitschrift für anorganische Chemie 06/2007; 633(9):1359 - 1365. · 1.16 Impact Factor
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    ABSTRACT: The title compounds were synthesized from RE, REX3, and Ge under an Ar atmosphere at 1200-1370 K. Y2GeI2 and Gd2GeI2 crystallize in space group Rm with lattice constants a = 4.2135(3) and 4.2527(1) A and c = 31.480(2) and 31.657(1) A, respectively. Gd2GeBr2 crystallizes in two modifications, the 1T-type (space group Pm1; a = 4.1668(2) A, c = 9.8173(6) A) and the 3R-type (space group Rm; a = 4.1442(9) A, c = 29.487(7) A). The structural motifs of RE2GeX2 compounds are Ge-centered slightly distorted RE6 octahedra connected via their common edges and extending in the a and b directions. The resulting close-packed double layers are separated by halogen atoms. The electrical resistivity measurements revealed semiconductor behavior for Y2GeI2 and Gd2GeI2 and a metal-semiconductor transition for 1T-Gd2GeBr2. Magnetic susceptibility and heat capacity measurements show long-range magnetic ordering for Gd2GeI2 and 1T-Gd2GeBr2 at approximately 15 and approximately 13 K, respectively.
    Inorganic Chemistry 05/2007; 46(8):3231-5. · 4.59 Impact Factor
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
    ChemInform 01/2007; 38(28).
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    ABSTRACT: The power of electron microscopy techniques for the determination of structure and composition of marginal byproducts is demonstrated for rare earth metal cluster compounds. Small amounts of the new phase Gd4GaI6 in samples with the nominal composition Gd7GaI12 could only be identified by a combined approach of EDX, electron diffraction and HRTEM. The structure of Gd4GaI6 can be assigned to the Y4BBr6-type containing chains of Gd6 octahedra which are centered by Ga atoms. The results of the electron microscopy study initiated the synthesis of homogeneous samples of the new compound Gd4GaI6 by applying the correct ratio of the starting materials.
    Zeitschrift für anorganische Chemie 01/2007; 633(10):1708-1712. · 1.16 Impact Factor