Single crystals of garnet-type trimanganese(II) dichrom-i-um(III) tris-[orthogermanate(IV)], Mn(II) (3)Cr(III) (2)(GeO(4))(3), were obtained by utilizing a chemical transport reaction. Corres-ponding to the mineral garnet with the general formula A(II) (3)B(III) (2)(SiO(4))(3), each of the four elements occupies only one crystallographically distinct position. Mn(2+) occupies the respective A position (Wyckoff site 24c, site symmetry 2.22), being surrounded by eight O atoms that form a distorted cube [d(Mn-O) = 2.291 (2) and 2.422 (2) Å, 4× each], while Cr(3+) on the B position (Wyckoff site 16a, site symmetry .-3.) is situated in a slightly distorted octa-hedron of six O(2-) anions [d(Cr-O) = 1.972 (2) Å, 6×]. In addition, the O atoms on general site 96h form isolated [GeO(4)](4-) tetra-hedra with Ge(4+) on site 24d [site symmetry -4..; d(Ge-O) = 1.744 (2) Å, 4×].
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http://dx.doi.org/10.1107/S1600536812016832 | DOI Listing |
J Am Chem Soc
November 2024
Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
Mixed-anion chalcogenides make up a versatile class of materials with properties that can be fine-tuned for specific applications. While chalcogen anions (Q = S, Se, or Te) tend to form solid solutions in simple binary systems, ordering does occur in structures that have more than one unique anion site. Here, we use crystallographic analysis and hard-soft acid-base principles to predict the Wyckoff positions that secondary chalcogens will occupy in a range of single-anion hosts.
View Article and Find Full Text PDFSensors (Basel)
October 2024
School of Physical Therapy, San Diego State University, San Diego, CA 92182, USA.
Background: Motion Tape (MT) is a low-profile, disposable, self-adhesive wearable sensor that measures skin strain. Preliminary studies have validated MT for measuring lower back movement. However, further analysis is needed to determine if MT can be used to measure lower back muscle engagement.
View Article and Find Full Text PDFJ Phys Condens Matter
October 2024
Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, Gujarat 390002, India.
Triply degenerate nodal point (TP) fermions, lacking elementary particle counterparts, have been theoretically anticipated as quasiparticle excitations near specific band crossing points constrained by distinct space-group symmetries instead of Lorentz invariance. Here, based oncalculations and symmetry analysis, we demonstrate the presence of TP fermions in Heusler alloys. Furthermore, we predict that these Heusler alloys are dynamically stable, exhibiting TP fermions along four distinctaxes in the F-43m space group.
View Article and Find Full Text PDFActa Crystallogr B Struct Sci Cryst Eng Mater
December 2024
Department of Chemistry, IIT Kharagpur, Kharagpur 721 302, India.
A detailed structural analysis of the Zn-rich δ-MnZn phase using single-crystal X-ray diffraction is presented. The δ phase has been synthesized by the high-temperature synthetic route. The structure crystallizes in space group P6/mmc (Pearson symbol hP556) with unit-cell parameters: a = b = 12.
View Article and Find Full Text PDFInorg Chem
July 2024
Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstraße 30, 48149 Münster, Germany.
GdAlRh was synthesized from the elements using arc-melting techniques, along with subsequent annealing. The title compound adopts the hexagonal MgZn type structure (space group 6/, 12, Wyckoff sequence ) with the Gd atoms found on the Mg positions (4), the Rh (2) and Al (6) atoms occupying the two Zn sites of the prototype. In addition, mixing of Rh and Al on both crystallographic positions is observed.
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