Conveners
Inorganic crystal structures
- Joachim Breternitz (Helmholtz-Zentrum Berlin für Materialien und Energie)
Inorganic crystal structures
- Thomas Doert (Technische Universität Dresden)
Inorganic crystal structures
- Thomas Schleid (Institute for Inorganic Chemistry, University of Stuttgart)
The mineral khurayyimite Caenter code here Zn$_4$(Si$_2$O$_7$)$_2$(OH)$_{10}$·4H$_2$O, (IMA 2018-140) was found in small cavities in altered spurrite marbles, in the northern part of the Siwaqa pyrometamorphic rock area, Central Jordan. It is a low-temperature, hydrothermal mineral and it forms at a temperature of ca. 100 °C. It builds nearly 50 μm white or colourless, platy crystals arranged...
Starting from the elements, the new compounds with the composition REGaTe2 (RE = La - Nd) could be obtained, which crystallize in the non-centrosymmetric space group Pmc21. As a possible unique feature, the presence of monovalent Ga atoms can be found for these compounds, resulting in a description of these compounds according to RE(III)Ga(I)Te(-II)2. For this an investigation of the bond...
Pale yellow crystals of $Ln$Sb$_2$O$_4$Br ($Ln$ = Eu – Tb) were synthesized via high temperature solid-state reactions from antimony sesquioxide, the respective lanthanoid sesquioxides and tribromides. Single-crystal X-ray diffraction studies revealed a layered structure in the monoclinic space group $P2_1/c$. In contrast to hitherto reported quaternary lanthanoid(III) halide...
The simultaneous reaction of oxygen, its heavier homologs, and metals usually lead to the formation of substances characterized by the presence of covalent O-Ch (Ch = S, Se) bonds within complex anions like sulfates or selenides. Examples for compounds containing both, O$^{2-}$ and Ch$^{2-}$ without any attractive interaction between these species are far less known. Only a few examples...
The structures of the rare earth metal polychalcogenides $REX_{2-\delta}$ (X = S, Se, Te; $0 \leq \delta \leq 0.2$) share a common motive of alternating stacks of a puckered [REX] double layer and planar [X] layer, which are structurally related to the ZrSSi type. This class of compounds adopts different (super)structures, according to the chalcogen defects in their planar layers. The...
Intriguing properties of mixed nitride networks have led to a range of viable applications. Nitrido(litho)aluminates, e.g. Sr[LiAl$_3$N$_4$]:Eu$^{2+}$ and Sr$_2$[MgAl$_5$N$_7$]:Eu$^{2+}$, are an important part of developments in the lightening industry due to their chemical and thermal stability and luminescence.$^{[1, 2]}$ Likewise, nitridosilicophosphates and nitridophosphates contain rare...
Homonuclear dinitrogen anions are common intermediates in biological and organometallic synthetic chemistry, and play an important role in the processes of nitrogen reduction to ammonia. In extended solid-state compounds, nitrogen is typically present in the form of a nitride anion N3− and does not form catenated polyanions. However at high-pressure conditions MN2 dinitride compounds of...
Magnetic topological insulators (MTIs) are a hot topic of materials science, promising future availability of spintronics with low energy consumption, quantum computing and phenomena like the Quantized Anomalous Hall Effect (QAHE) [1-2]. MTIs are chemically and structurally akin to the original non-magnetic topological insulators. Of those, the tetradymites Bi2Te3 and Sb2Te3 have recently...
The charge density wave (CDW) is a collective phenomenon where electrons at the Fermi level form a density wave with an additional periodicity as compared to the atomic lattice. RE$_2$Ru$_3$Ge$_5$ (RE = Pr, Sm, Dy) crystallize in the Sc$_2$Fe$_3$Si$_5$-type structure (space group $P$4/$nmc$). They show peculiar CDW-induced lattice modulations in a certain temperature range below which...
The crystal chemistry of AIBIIXO4 (AI = Alkali ion, BII = alkali-earth ion, X = P, V, As) is very rich and has been widely investigated, particularly the phosphate family [1]. In recent years, we have been investigated the crystal structures [2,3] and magnetic properties of some compositions within the AIBIIXO4 series [4]. However, despite its simple chemistry NaSrPO4 has never been reported...
The crystal structure of the mineral tetradymite Bi2S2Te has inspired discussions about its details for a long time.[1,2] Variations of this structure led to a large family of chalcogenides composed of slabs with alternating cation and anion layers stacked in rocksalt-type fashion, which show characteristic van der Waals gaps between anion layers.[3] These compounds are of interest not only...
Crystal Structures and Anisotropic Expansion of Coordination Compounds from the Mg(SCN)2 · x H2O/THF System
- Introduction
Magnesium halides and pseudo-halides are essential compounds for many applications ranging from biochemistry to construction and building materials. These phases exhibit a great variety of chemical and structural properties and hence, were extensively studied....
Transition-metal carbides exhibit high melting points, high hardness, and metallic conductivity that make these materials attractive candidates for different technological applications and for material science studies. Carbon has the capability of forming various bonding states affecting the structures and properties of transition metal carbides. High pressure can be used to alter bonding...
