Nanometric iron(III) oxide has been of great interest in a wide range fields due to its magnetic properties, eminent biochemical characteristics, and potential for technological applications. Among iron oxides, ε-Fe2O3 is considered as remarkable phase giant coercive field at room temperature ferromagnetic resonance capability. Here we present the first size-dependent map via γ → ε α pathway together with activation energies transformations, based on X-ray powder diffraction (XRD)...

Abstract Recent success in experimental and theoretical works on metal thiophosphates (MTPs) paved the way to add multiple functionalities of complex oxides, such as ferroelectricity, 2D materials. To realize multiferroicity magnetoelectric coupling layered van der Waals materials, incorporating magnetic ions ferroelectric framework is desirable. Unfortunately, replacing ion with a one MTPs results antiferroelectricity which spontaneous macroscopic polarization absent. Herein, emergence...

The ν3 and ν4 vibrational transitions of methane trapped in solid parahydrogen have been observed by using Fourier transform infrared high resolution laser spectroscopy. spectrum is interpreted terms rovibrational states the spherical rotor which are subjected to crystal field splitting. band shows extremely sharp lines a width ∼0.003 cm−1, while exhibits broader 1 cm−1. selection rules derived from an extended group theory take into account effect consistent with spectra. intermolecular...

The flux of solutes from the chemical weathering continental crust supplies a steady supply essential nutrients necessary for maintenance Earth's biosphere. Promotion by microorganisms is well-documented phenomenon and most often attributed to heterotrophic microbial metabolism purposes nutrient acquisition. Here, we demonstrate role chemolithotrophic ferrous iron [Fe(II)]-oxidizing bacteria in biogeochemical subsurface Fe(II)-silicate minerals at Luquillo Critical Zone Observatory Puerto...

(1) Background: Solid dispersion (SD) can help increase the bioavailability of poorly water-soluble drugs. Meanwhile, apixaban (APX)—a new anticoagulation drug—has low water solubility (0.028 mg/mL) and intestinal permeability (0.9 × 10−6 cm/s across Caco-2 colonic cells), thus resulting in a oral <50%; (2) Methods: To solve drawbacks conventional APX products, novel SD Soluplus® was prepared, characterized by differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD)...

Abstract Mudrocks and mud-sized sediments (i.e., silt to clay) dominate the surface of Earth Mars. These fine-grained preserve a rich history sedimentary processes from source sink shed light on ancient climates. However, both physical chemical nature these materials make them difficult fully characterize with traditional laboratory techniques. Here, we explore cross-disciplinary high-resolution approach synchrotron radiation for X-ray diffraction, pair distribution function analysis,...

Cationic-exchange methods allow for the fabrication of metastable phases or shapes, which are impossible to obtain with conventional synthetic colloidal methods. Here, we present systematic heteronanostructured (HNS) Cu2–xS@CuInS2 nanodisks via a cationic-exchange reaction between Cu and In atoms. The indium–trioctylphosphine complex favorably attacks lateral (16 0 0) plane roxbyite Cu2–xS hexagon. We explain phenomena by estimating formation energy vacancies heat required exchange three...

Calcium carbonate minerals, such as aragonite and calcite, are widespread in biomineral skeletons, shells, exoskeletons, more. With rapidly increasing pCO2 levels linked to anthropogenic climate change, minerals face the threat of dissolution, especially an acidifying ocean. Given right conditions, Ca-Mg carbonates (especially disordered dolomite dolomite) alternative for organisms utilize, with added benefit being harder more resistant dissolution. also holds greater potential carbon...

Luogufengite, Al-bearing ε-Fe2O3, is a new member of Fe2O3 polymorphs discovered in late Pleistocene basaltic scoria from the Menan Volcanic Complex nearby Rexburg, Idaho. It an oxidation product Fe-bearing glass at high temperature and associated with maghemite hematite. Luogufengite euhedral or semi-euhedral nano-mineral its crystal size ranging ~20 to ~120 nm. The mineral has space group Pna21; unit-cell parameters refined synchrotron X-ray powder diffraction pattern are = 5.0647(3), b...

The structure and crystal chemistry of vernadite in ferromanganese crusts from the Magellan Seamount north-west Pacific Ocean have been investigated using synchrotron X-ray diffraction (XRD), pair distribution function (PDF) high-resolution transmission electron microscopy (TEM). XRD patterns mainly show two strong peaks at 2.42-2.43 Å 1.41 without or with a broad (001) peak, indicating thin layer nanophases along c-direction. TEM images flat curved sheet-like nanocrystals thickness ∼7.2...

Determination of the atomic-scale structures certain fine-grained minerals using single-crystal X-ray diffraction (XRD) has been challenging because they commonly occur as submicron and nanocrystals in geological environment. Synchrotron powder scattering techniques are useful complementary methods for studying this type minerals. In review, we discussed three example studies investigated by combined synchrotron radiation XRD pair distribution function (PDF) techniques: (1) low-temperature...

Nanophase Fe-oxyhydroxides in freshwater ferromanganese nodules (FFN) from Green Bay, Lake Michigan, and adsorbed arsenate have been investigated by X-ray powder diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Z-contrast imaging, ab initio calculations using the density functional theory (DFT). The samples northern Bay can be divided into two types: Fe-Mn Fe-rich nodules. manganese-bearing phases are todorokite, birnessite, buserite. iron-bearing feroxyhyte,...

The crystal structure of moganite from the Mogán formation on Gran Canaria has been re-investigated using high-resolution synchrotron X-ray diffraction (XRD) and X-ray/neutron pair distribution function (PDF) analyses. Our study for first time reports anisotropic atomic displacement parameters (ADPs) a natural moganite. Rietveld analysis XRD data determined with space group I2/a. refined unit-cell are = 8.7363(8), b 4.8688(5), c 10.7203(9) Å, β 90.212(4)°. ADPs Si O in were obtained neutron...

Determination of the crystal structures low-temperature tridymite and cristobalite using single-crystal XRD has been challenging because they generally occur as metastable fine-grained crystals in geological environment. Therefore, powder diffraction scattering techniques is critical to study crystals. Synchrotron X-ray (XRD), pair distribution function (PDF) transmission electron microscopy were used investigate structure orthorhombic with C2221 symmetry tetragonal P41212 symmetry,...

A paleosol beneath the Upper Cambrian Mount Simon Sandstone in Wisconsin provides an opportunity to evaluate characteristics of weathering a subtropical climate, having been located at 20°S paleolatitude 500 My ago. The 285-cm-thick resulted from advanced chemical gabbroic protolith, recording total mass loss 50%. Weathering hornblende and plagioclase produced pedogenic assemblage quartz, chlorite, kaolinite, goethite, and, lowest part profile, siderite. Despite paucity quartz protolith 40%...

Abstract Valleyite, Ca4(Fe,Al)6O13, is a new sodalite-type mineral discovered in late Pleistocene basaltic scoria from the Menan Volcanic Complex near Rexburg, Idaho, U.S.A. It an oxidation product of glass during early stage formation and associated with hematite (α-Fe2O3), maghemite (γ-Fe2O3), luogufengite (ε-Fe2O3), quartz on surface vesicles. The measured crystal size valleyite ranges ~250 to ~500 nm. empirical chemical formula (Ca3.61Mg0.39)(Fe3.97Al1.91Ti0.09)O13. has space group I43m....

This paper presents a one-step route to the production of siliceous six-line ferrihydrite (6LFh) by oxidizing aqueous Fe2+–silicate metal complex in solution. Synthetic 6LFh is analogous naturally occurring based on X-ray diffraction and transmission electron microscopy results. We also synthesized ferrihydrites different conditions understand formation mechanism. The experimental results show continuous series between two six lines increasing Fe/Si molar ratio, temperature, reaction time....