Phase-Change Memory from Molecular Tellurides.

Phase-change memory (PCM) is an emerging memory technology based on the resistance contrast between the crystalline and amorphous states of a material. Further development and realization of PCM as a mainstream memory technology rely on innovative materials and inexpensive fabrication methods. Here, we propose a generalizable and scalable solution-processing approach to synthesize phase-change telluride inks in order to meet demands for high-throughput material screening, increased energy efficiency, and advanced device architectures.

Flux Growth, Crystal Structure, and Chemical Bonding of YbPdGe, an AlB Superstructure within the Rare-Earth Series.

The complete structure revision of the PdGe ( = rare-earth metal) series revealed that YbPdGe is the only AlB ordered superstructure. Good-quality single crystals of this compound were successfully grown from molten indium flux, enabling accurate single-crystal investigations. YbPdGe crystallizes with the CeCoSi-type structure in the hexagonal space group 6/ (no.

Unpredicted but It Exists: Trigonal ScRu with a Significant Metal-Metal Charge Transfer.

The ScRu compound, obtained by high-temperature synthesis, was found to crystallize in a new trigonal 45 structure type [space group 3̅1; = 9.3583(9) Å and = 11.285(1) Å]: Ru@Sc cubes, Ru@Sc icosahedra, and uncommon Ru@Sc sphenocoronae are the building blocks of a unique motif tiling the whole crystal space.

LaPdGe and NdPdGe Compounds: Chemical Bonding and Physical Properties.

The two LaPdGe and NdPdGe compounds, crystallizing in the 40-UCoGe crystal structure, were targeted for analysis of their chemical bonding and physical properties. The compounds of interest were obtained by arc melting and characterized by differential thermal analysis, scanning electron microscopy, and X-ray diffraction both on powder and on a single crystal (for the La analogue), to ensure the high quality of the samples and accurate crystallographic data. Chemical bonding was studied by analyzing the electronic structure and effective QTAIM charges of LaPdGe.

Polar-Covalent Bonding Beyond the Zintl Picture in Intermetallic Rare-Earth Germanides.

A comparative chemical bonding analysis for the germanides La MGe (M=Li, Mg, Al, Zn, Cu, Ag, Pd) and Y PdGe is presented, together with the crystal structure determination for M=Li, Mg, Cu, Ag. The studied compounds adopt the two closely related structure types oS72-Ce (Ga Ge ) and mS36-La AlGe , containing zigzag chains and corrugated layers of Ge atoms bridged by M species, with La/Y atoms located in the biggest cavities. Chemical bonding was studied by means of the quantum chemical position-space techniques QTAIM (quantum theory of atoms in molecules), ELI-D (electron localizability indicator), and their basin intersections.

A new glance on RMGe (R = rare earth metal, M = another metal) compounds. An experimental and theoretical study of RPdGe germanides.

The RPdGe series (R = rare earth metal) was structurally characterized, and the results achieved were extended for a comprehensive study on RMGe (M = another metal) compounds, employing symmetry-based structural rationalization and energy calculations. Directly synthesized RPdGe exists for almost all R-components (R = Y, La-Nd, Sm and Gd-Lu) and even if with La is probably metastable. Several single crystal X-ray analyses (R = Y, Ce, Pr, Nd, Er and Lu) indicated oS72-Ce(GaGe) as the correct structure.

Yb9+xCuMg4-x (x = 0.034): A κ-Phase Formed by Lanthanoids.

Atom order in the crystal structures of Yb2Cu2-xMg (x = 0.17; Mo2FeB2-type; P4/mbm; a = 0.75592(2) nm; c = 0.

Vacancy ordering as a driving factor for structural changes in ternary germanides: the new R2Zn(1-x)Ge6 series of polar intermetallics (R = rare-earth metal).

Synthesis and structural characterization of the new compounds R2Zn1-xGe6 (R = La-Nd, Sm, Gd-Ho) is reported. A structural change was revealed along this series by careful analysis of single-crystal X-ray diffraction data. For light rare earths up to Tb the orthorhombic oS72-Ce2(Ga0.

New ternary germanides La4Mg5Ge6 and La4Mg7Ge6: crystal structure and chemical bonding.

The synthesis, structural characterization, and chemical-bonding peculiarities of the two new polar lanthanum-magnesium germanides La(4)Mg(5)Ge(6) and La(4)Mg(7)Ge(6) are reported. The crystal structures of these intermetallics were determined by single-crystal X-ray diffraction analysis. The La(4)Mg(5)Ge(6) phase crystallizes in the orthorhombic Gd(4)Zn(5)Ge(6) structure type [Cmc2(1), oS60, Z = 4, a = 4.

Anti-mackay polyicosahedral clusters in La-Ni-Mg ternary compounds: synthesis and crystal structure of the La(43)Ni(17)Mg(5) new intermetallic phase.

The crystal structure of the complex La(43)Ni(17)Mg(5) ternary phase was solved and refined from X-ray single crystal diffraction data. It is characterized by a very large unit cell and represents a new structure type: La(43)Ni(17)Mg(5) - orthorhombic, Cmcm, oS260, a = 10.1895(3), b = 17.