Nitrates of cerium and samarium deposit on human enamel independently of a salivary pellicle.

Objectives: The aim of this study was to analyze the precipitation of Cerium(III)nitrate hexahydrate [Ce(NO)] or Samarium(III)nitrate hexahydrate [Sm(NO)] solutions on human enamel with and without a salivary pellicle. Investigated parameters were At%Ce and At%Sm measured using energy dispersive x-ray spectroscopy (EDX) after test solution (two concentrations) application.

Materials And Methods: Precipitation of Ce(NO) and Sm(NO) solutions was examined on human enamel with and without a salivary pellicle.

Enhanced sodium ion mobility in sodium tellurosilicates and crystal structures of NaSiTe and NaSiTe with isolated [SiTe] tetrahedra and isolated Te anions.

The sodium tellurosilicates NaSiTe, NaSiTe, NaSiTe and NaSiTe were synthesized by ball milling and subsequent high temperature solid state reactions and analyzed by electrochemical impedance spectroscopy. All compounds show moderate to remarkable sodium ion conductivities. The crystal structures of the novel materials NaSiTe and NaSiTe were determined by X-ray diffraction.

Cerium- and samarium-nitrate interaction and accumulation on human dentin.

Objective: To investigate the accumulation of cerium-nitrate and samarium-nitrate on dentin without or with smear-layer and to test their antibacterial activity.

Design: 24 dentin-enamel slices were cut from 24 extracted molars. 12 slices underwent smear-layer creation (320 grit, 200 g, 5 s), the other 12 smear-layer removal (20 % EDTA, 300 s).

The cubic structure of LiAs stabilized by substitution - LiTtAs (Tt = Si, Ge) and LiTtAs (Tt = Si, Ge, Sn) and their lithium ion conductivity.

The new lithium arsenidotetrelates LiSiAs, LiGeAs, LiSiAs, LiGeAs and LiSnAs were synthesized ball milling and structurally characterized by Rietveld analysis of X-ray powder diffraction data. The aliovalent substitution of lithium in hexagonal LiAs by introducing a tetravalent tetrel cation stabilizes cubic structures for LiTtAs (Tt = Si, Ge) in the space group 3̄ and for the lithium richer compound LiTtAs (Tt = Si, Ge, Sn) in the higher symmetrical space group 3̄ (no. 225).

Chemical Bonding Induces One-Dimensional Physics in Bulk Crystal BiIrSe.

One-dimensional (1D) systems persist as some of the most interesting because of the rich physics that emerges from constrained degrees of freedom. A desirable route to harness the properties therein is to grow bulk single crystals of a physically three-dimensional (3D) but electronically 1D compound. Most bulk compounds which approach the electronic 1D limit still field interactions across the other two crystallographic directions and, consequently, deviate from the 1D models.

Synthesis and Characterization of NaSiSe-24 and NaSiSe-48, Two Polymorphs with Different Anionic Structures.

Two different polymorphs of the new selenosilicate NaSiSe were synthesized by solid-state reactions. The high-temperature polymorph NaSiSe-24 crystallizes in the tetragonal space group 4/ (No. 132) with lattice parameters = 7.

Synthesis of an aqueous, air-stable, superconducting 1T'-WS monolayer ink.

Liquid-phase chemical exfoliation can achieve industry-scale production of two-dimensional (2D) materials for a wide range of applications. However, many 2D materials with potential applications in quantum technologies often fail to leave the laboratory setting because of their air sensitivity and depreciation of physical performance after chemical processing. We report a simple chemical exfoliation method to create a stable, aqueous, surfactant-free, superconducting ink containing phase-pure 1T'-WS monolayers that are isostructural to the air-sensitive topological insulator 1T'-WTe.

Surface Accumulation of Cerium, Self-Assembling Peptide, and Fluoride on Sound Bovine Enamel.

The accumulation of caries-preventive compounds on sound enamel is crucial in order to improve the inhibition of carious lesion initiation. The aim of this research was to investigate the initial accumulation of cerium, oligopeptide p11-4, and fluoride from NaF or amine fluoride (AmF) on sound enamel in vitro by means of energy dispersive X-ray spectroscopy (EDX). Polished bovine enamel specimens (n = 120 from 60 teeth) were fabricated.

Polymorphism and optical, magnetic and thermal properties of the either phyllo- or inosilicate-analogous borosulfate Cu[B(SO)].

Two polymorphs of the borosulfate Cu[B(SO)] can be selectively prepared by solvothermal syntheses. The crystal structures of inosilicate-analogous α-Cu[B(SO)] (1̄, no. 2, = 5.

Strong Lewis and Brønsted Acidic Sites in the Borosulfate Mg [H O→B(SO ) ].

Borosulfates provide fascinating structures and properties that go beyond a pure analogy to silicates. Mg [H O→B(SO ) ] is the first borosulfate featuring a boron atom solely coordinated by three tetrahedra. Thus, the free Lewis acidic site forms a Lewis acid-base adduct with a water molecule.

A Second Modification of Beryllium Bromide: β-BeBr.

The synthesis of a second beryllium bromide modification, β-BeBr, was accomplished through recrystallization of α-BeBr from benzene in the presence of -decamethylpentasiloxane. This phase was analyzed via single-crystal X-ray diffraction and IR and Raman spectroscopy as well as density functional theory calculations. This enabled a comparison to α-BeBr and the α and β phases of beryllium chloride and iodide.

From S-O-S to B-O-S to B-O-B Bridges: Ba[B(SO)] as a Model System for the Structural Diversity in Borosulfate Chemistry.

Various different possible connection patterns of sulfate and borate tetrahedra enable a vast structural diversity in borosulfates, a rather new class of silicate-analogous compounds. Here we unravel a direct relationship from S-O-S to B-O-S to B-O-B bridges for the first time in borosulfate chemistry. Solvothermal synthesis in pure oleum (65% SO) yielded the first alkaline earth metal borosulfate comprising S-O-S bridges: Ba[B(SO)] (2/, = 4, = 1160.

Synthesis-Controlled Polymorphism and Optical Properties of Phyllosilicate-Analogous Borosulfates M[B (SO ) ] (M=Mg, Co).

Increased synthetic control in borosulfate chemistry leads to the access of various new compounds. Herein, the polymorphism of phyllosilicate-analogous borosulfates is unraveled by adjusting the oleum (65 % SO ) content. The new polymorphs β-Mg[B (SO ) ] and α-Co[B (SO ) ] both consist of similar layers of alternating borate and sulfate tetrahedra, but differ in the position of octahedrally coordinated cations.

Soft Chemical Synthesis of HCrS: An Antiferromagnetic Material with Alternating Amorphous and Crystalline Layers.

We report a new HCrS-based crystalline/amorphous layered material synthesized by soft chemical methods. We study the structural nature and composition of this material with atomic resolution scanning transmission electron microscopy (STEM), revealing a complex structure consisting of alternating layers of amorphous and crystalline lamellae. Furthermore, the magnetic properties show evidence for increased magnetic frustration compared to the parent compound NaCrS.

The very first normal-pressure tin borate SnBO, and the intermediate Sn[BO]F.

Aside from amorphous phases, only a single crystalline tin borate had been synthesised so far under high pressure. In this work, we present the very first crystalline ternary tin borate Sn3B4O9 synthesised under ambient pressure by decomposition of Sn3[B3O7]F above 500 °C. The crystal structure of Sn3B4O9 (P21/c, Z = 4, a = 768.

Synthesis and Characterization of the Tin Iodide Borate Sn[BO]I.

The tin iodide borate Sn[BO]I was synthesized via a hydrothermal synthesis and crystallizes in the centrosymmetric space group Pbca (no. 61) possessing lattice parameters of a = 1071.8(3), b = 852.

From Laboratory Press to Spins with Giant Effects.

Parallelly aligned spins in Co-Kagome nets have provided several reasons for researchers to celebrate: Liu et al. and Wang et al. have reported discoveries of unique combinations of properties: Sn Co S =Co Sn S =SnCo S exhibits giant anomalous Hall effects that exceed those of known materials by orders of magnitude.

Synthesis and Characterization of the First Tin Fluoride Borate Sn [B O ]F with Second Harmonic Generation Response.

The new non-centrosymmetric tin fluoride borate Sn [B O ]F was synthesized hydrothermally, and was characterized by single-crystal and powder X-ray diffraction, vibrational spectroscopy, DFT calculations, second harmonic generation (SHG) measurements, thermogravimetry, and differential scanning calorimetry. Its SHG response is about 12 times that of quartz. The compound crystallizes in the non-centrosymmetric orthorhombic space group Pna2 with lattice parameters a=922.

A facile synthesis for BeCl, BeBr and BeI.

Here we present a facile synthesis for anhydrous BeCl2, BeBr2 and BeI2 from the elements under mild conditions. While this method delivers pure BeI2 directly, BeCl2 and BeBr2 were further purified by vacuum sublimation. Complete sets of solid state IR and Raman spectroscopic and X-ray powder diffraction data of these beryllium halides were collected including the previously missing IR and Raman spectra of BeBr2 and BeI2.

The First Alkaline-Earth Fluorooxoborate Ba[B O F ]-Characterisation and Doping with Eu.

The very first alkaline-earth fluorooxoborate Ba[B O F ] was synthesised by solid state methods starting from Ba(BF ) , β-BaB O , and B O . The crystal structure derived from single-crystal X-ray diffraction (P2 /n, a=6.6384(2) Å, b=7.

Mo B O -Connecting Borate and Metal-Cluster Chemistry.

We report on the first thoroughly characterized molybdenum borate, which was synthesized in a high-pressure/high-temperature experiment at 12.3 GPa/1300 °C using a Walker-type multianvil apparatus. Mo B O incorporates tetrahedral molybdenum clusters into an anionic borate crystal structure-a structural motif that has never been observed before in the wide field of borate crystal chemistry.

Synthesis and Characterization of the High-Pressure Nickel Borate γ-NiBO.

γ-NiBO was synthesized in a high-pressure/high-temperature experiment at 5 GPa and 900 °C. The single-crystal structure analysis yielded the following results: space group P622 (No. 179), a = 425.

Black Arsenic-Phosphorus: Layered Anisotropic Infrared Semiconductors with Highly Tunable Compositions and Properties.

New layered anisotropic infrared semiconductors, black arsenic-phosphorus (b-AsP), with highly tunable chemical compositions and electronic and optical properties are introduced. Transport and infrared absorption studies demonstrate the semiconducting nature of b-AsP with tunable bandgaps, ranging from 0.3 to 0.

Synthesis, structural characterization, and physical properties of Cs2Ga2S5, and redetermination of the crystal structure of Cs2S6.

The reaction of CsN3 with GaS and S at elevated temperatures results in Cs2Ga2S5. Its crystal structure was determined from single-crystal X-ray diffraction data. The colorless solid crystallizes in space group C2/c (no.

Cd4Cu7As, the first representative of a fully ordered, orthorhombically distorted MgCu2 Laves phase.

The ternary Laves phase Cd(4)Cu(7)As is the first intermetallic compound in the system Cu-Cd-As and a representative of a new substitution variant for Laves phases. It crystallizes orthorhombically in the space group Pnnm (No. 58) with lattice parameters a = 9.