Synthesis, crystal structure, and thermal stability of new borates Na3REB2O6 (RE = Pr, Sm, Eu)

2016 ◽  
Vol 31 (2) ◽  
pp. 110-117 ◽  
Author(s):  
Zhixun Wang ◽  
Hangkong Li ◽  
Gemei Cai ◽  
Zhanpeng Jin
Keyword(s):  
Diffraction Method ◽  
Structure Type ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Subsolidus Phase ◽  
Thermal Stabilities ◽  
Subsolidus Phase Equilibrium ◽  
Three Phase ◽  
First Time

Subsolidus phase equilibrium of Na2O–Sm2O3–B2O3 system has been investigated mainly by solid-state reaction and powder X-ray diffraction method. There are nine definite three-phase regions and three ternary compounds determined under present experimental conditions. A novel compound Na3SmB2O6 was found and confirmed in this system, along with its two homogeneous compounds Na3REB2O6 (RE = Pr, Eu) synthesized for the first time. The indexing results showed that all three compounds crystallize in the monoclinic space group P21/c (No.14) with the same structure type as both Na3NdB2O6 and Na3GdB2O6. The lattice parameters (a, b, and c) of new borates Na3REB2O6 (RE = Pr, Sm, Eu) decrease linearly with a decreasing radius of RE ion, which obeys the Lanthanide-contraction rule. The existence of a trigonal BO3 group in the Na3REB2O6 (RE = Pr, Sm) compounds was confirmed by analysis of their infrared absorption spectra. Thermal stabilities of the three new borates have been investigated.

scholarly journals Structural, Superconducting and Magnetic Properties of La3-XRxNi2B2N3-δ with R = Ce, Pr, Nd

2011 ◽  
Vol 170 ◽  
pp. 165-169 ◽  
Author(s):  
Tahir Ali ◽  
Ernst Bauer ◽  
Gerfried Hilscher ◽  
Herwig Michor
Keyword(s):  
Magnetic Properties ◽  
Structure Type ◽  
The Body ◽  
Spin Reorientation ◽  
Superconducting Transition ◽  
X Ray Diffraction ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order ◽  
First Time ◽  
Magnetic Pair

We report on structural and superconducting properties of La3-xRxNi2B2N3- where La is substituted by the magnetic rare-earth elements Ce, Pr, Nd. The compounds Pr3Ni2B2N3- and Nd3Ni2B2N3- are characterized for the first time. Powder X-ray diffraction confirmed all samples R3Ni2B2N3- with R = La, Ce, Pr, Nd and their solid solutions to crystallize in the body centered tetragonal La3Ni2B2N3 structure type. Superconducting and magnetic properties of La3-xRxNi2B2N3- were studied by resistivity, specific heat and susceptibility measurements. While La3Ni2B2N3- has a superconducting transition temperature Tc ~ 14 K, substitution of La by Ce, Pr, and Nd leads to magnetic pair breaking and, thus, to a gradual suppression of superconductivity. Pr3Ni2B2N3- exibits no long range magnetic order down to 2 K, Nd3Ni2B2N3- shows ferrimagnetic ordering below TC =17 K and a spin reorientation transition to a nearly antiferromagnetic state at 10 K.

Experimental and computational investigations of TiIrB: a new ternary boride with Ti1+x Rh2−x+y Ir3−y B3-type structure

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jan P. Scheifers ◽  
Kate A. Gibson ◽  
Boniface P. T. Fokwa
Keyword(s):  
Density Functional ◽  
Ternary Phase ◽  
Structure Type ◽  
X Ray Diffraction ◽  
Functional Theory ◽  
Arc Melting ◽  
Ternary Boride ◽  
Charge Analysis ◽  
First Time ◽  
Bader Charge Analysis

Abstract A new ternary phase, TiIrB, was synthesized by arc-melting of the elements and characterized by powder X-ray diffraction. The compound crystallizes in the orthorhombic Ti1+x Rh2−x+y Ir3−y B3 structure type, space group Pbam (no. 55) with the lattice parameters a = 8.655(2), b = 15.020(2), and c = 3.2271(4) Å. Density Functional Theory (DFT) calculations were carried out to understand the electronic structure, including a Bader charge analysis. The charge distribution of TiIrB in the Ti1+x Rh2−x+y Ir3−y B3-type phase has been evaluated for the first time, and the results indicate that more electron density is transferred to the boron atoms in the zigzag B4 units than to isolated boron atoms.

Supramolecular assembly of two copper(II) coordination compounds of topiroxostat with dialkylformamide ligands

2019 ◽  
Vol 74 (6) ◽  
pp. 479-484 ◽  
Author(s):  
Li-Ting Jiang ◽  
Xiang Chang ◽  
Sheng-Chun Chen ◽  
Xue-Jun Feng ◽  
Qun Chen
Keyword(s):  
Coordination Compounds ◽  
Supramolecular Assembly ◽  
Oxidase Inhibitor ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Thermal Stabilities ◽  
Xanthine Oxidase Inhibitor ◽  
Triclinic Space Group ◽  
Space Group ◽  
Supramolecular Coordination

AbstractA well-known selective xanthine oxidase inhibitor topiroxostat, 4-[3-(4-pyridinyl)-1H-1,2,4-triazol-5-yl]-2-pyridinecarbonitrile (ptpc), was selected to react with Cu(NO3)2 · 3H2O in dialkylformamide solvents, affording two novel supramolecular coordination compounds [Cu(ptpc)2(NO3)(DMF)2] · NO3 (1) and Cu(ptpc)2(NO3)2(DEF)2 (2). Single-crystal X-ray diffraction revealed that compound 1 crystallizes in the monoclinic space group C2/c. The components are assembled to a 3D supramolecular framework through hydrogen-bonding interactions between the large [Cu(ptpc)2(NO3)(DMF)2]+ cationic moieties and the nitrate anions. Compound 2 crystallizes in the triclinic space group P1̅ and shows a 2D hydrogen-bonded network structure. The results clearly indicate that dialkylformamide solvents with different sizes have an important influence on the structures of the complexes. The luminescence properties of 1 and 2 in the solid state and their thermal stabilities were also investigated.

Single-Crystal Synthesis and Structure Refinement of Na0.44MnO2

2011 ◽  
Vol 170 ◽  
pp. 198-202 ◽  
Author(s):  
Junji Akimoto ◽  
Hiroshi Hayakawa ◽  
Norihito Kijima ◽  
Junji Awaka ◽  
Fuji Funabiki
Keyword(s):  
Single Crystal ◽  
Structure Refinement ◽  
Bond Distance ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
Single Chain ◽  
X Ray ◽  
Crystal Synthesis ◽  
Manganese Valence ◽  
First Time

Single crystals of Na0.44MnO2 (=Na4Mn9O18) have been synthesized by a flux method at 1173 K for the first time. The crystal structure of Na0.44MnO2 has been refined by single-crystal X-ray diffraction method. The framework structure consists of double and triple rutile-type chains of edge-sharing MnO6 octahedra and a single chain of edge-sharing MnO5. The Mn-O bond distance and bond valence analyses revealed the manganese valence Mn3+/Mn4+ ordering in the Na0.44MnO2 structure.

scholarly journals PENUNTUN PRATIKUM FISIKA - MERRY THRESSIA, S.Si, M.Si

2019 ◽  
Author(s):  
Merry Thressia
Keyword(s):  
Friction Force ◽  
Fluid Pressure ◽  
Diffraction Method ◽  
Average Density ◽  
Kinetic Friction ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Cohesion Force ◽  
Specific Object ◽  
The City

Densistas (density / density) is a measurement of mass per unit volume of matter. The higher the density of an object, the greater the mass of each volume. The average density of each object is the total mass divided by the total volume.Archimedes was the greatest scientist of his time. He was born in the city of Syracuse, Sicily in 287 BC and died in 212 BC. Archimedes is known as a physicist, mathematician, optics and astronomy. He was nicknamed the Father of Experiments, for basing his findings on experiments. He found the law on an event called Archimedes' Law which reads, "if an object is inserted into a liquid, either partially or completely, it will get an upward force equal to the weight of the liquid transferred by the object".X-ray diffraction method is one way to study the regularity of atoms or molecules in a certain structure. If the structure of an atom or molecule is arranged regularly to form a lattice, then electromagnetic radiation in certain experimental conditions will be strengthened.An object moves on a surface, on an object it works a kinetic friction force that opposes the direction of motion of an object. The magnitude of the kinetic force depends on the nature of the two surfaces in contact. For two specific object surfaces, the kinetic friction force is proportional to the normal force. The friction force does not depend on the surface area that is in contact. The rough and slippery nature of the surfaces of two touching fields is expressed by the friction coefficient.Fluid viscosity (liquid) is friction caused by a moving fluid, or solid object that moves in the fluid. The amount of friction is called the degree of viscosity of liquid. So the greater the viscosity of the liquid, the more difficult the solids move within the liquid. Viscosity in liquid, which plays a role is the cohesion force between liquid particles. Viscosity can be expressed as fluid flow resistance which is friction between liquid molecules from one anotherBernoulli principle is fluid pressure in a place where the velocity is smaller than in a place where the speed is lower. So the greater the velocity of fluid in a pipe, the smaller the pressure and vice versa, the smaller the velocity of fluid in a pipe, the greater the pressure.

scholarly journals Surface Modification of Bentonite with Polymer Brushes and Its Application as an Efficient Adsorbent for the Removal of Hazardous Dye Orange I

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1112 ◽  
Author(s):  
Wenjuan Guo ◽  
Ahmad Umar ◽  
Yankai Du ◽  
Luyan Wang ◽  
Meishan Pei
Keyword(s):  
Polymer Brushes ◽  
Adsorption Property ◽  
Gravimetric Analysis ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Anionic Dyes ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Pseudo Second Order ◽  
First Time

Poly(2-(dimethylamino)ethyl methacrylate)-grafted bentonite, marked as Bent-PDMAEMA, was designed and prepared by a surface-initiated atom transfer radical polymerization method for the first time in this study. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA) were applied to characterize the structure of Bent-PDMAEMA, which resulted in the successful synthesis of Bent-PDMAEMA. As a cationic adsorbent, the designed Bent-PDMAEMA was used to remove dye Orange I from wastewater. The adsorption property of Bent-PDMAEMA for Orange I dye was investigated under different experimental conditions, such as solution pH, initial dye concentration, contact time and temperature. Under the optimum conditions, the adsorption amount of Bent-PDMAEMA for Orange I dye could reach 700 mg·g−1, indicating the potential application of Bent-PDMAEMA for anionic dyes in the treatment of wastewater. Moreover, the experimental data fitted well with the Langmuir model. The adsorption process obeyed pseudo-second-order kinetic process mechanism.

Lanthanum tetrazinc, LaZn4

2012 ◽  
Vol 68 (6) ◽  
pp. i37-i40 ◽  
Author(s):  
Igor Oshchapovsky ◽  
Volodymyr Pavlyuk ◽  
Grygoriy Dmytriv ◽  
Alexandra Griffin
Keyword(s):  
Rare Earth ◽  
Diffraction Data ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Structure Type ◽  
Alkaline Earth Metal ◽  
X Ray Diffraction ◽  
X Ray ◽  
A Site ◽  
First Time

The structure of lanthanum tetrazinc, LaZn4, has been determined from single-crystal X-ray diffraction data for the first time, approximately 70 years after its discovery. The compound exhibits a new structure type in the space groupCmcm, with one La atom and two Zn atoms occupying sites withm2msymmetry, and one Zn atom occupying a site with 2.. symmetry. The structure is closely related to the BaAl4, La3Al11, BaNi2Si2and CaCu5structure types, which can be presented as close-packed arrangements of 18-vertex clusters, in this case LaZn18. The kindred structure types contain related 18-vertex clusters around atoms of the rare earth or alkaline earth metal.

First pump–probe–probe hard X-ray diffraction experiments with a 2D hybrid pixel detector developed at the SOLEIL synchrotron

2020 ◽  
Vol 27 (2) ◽  
pp. 340-350 ◽  
Author(s):  
Diana Bachiller-Perea ◽  
Yves-Marie Abiven ◽  
Jérôme Bisou ◽  
Pierre Fertey ◽  
Pawel Grybos ◽  
...  
Keyword(s):  
Photon Counting ◽  
Frame Rate ◽  
Pixel Detector ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Pump Probe ◽  
X Ray ◽  
Benchmark Experiment ◽  
Validation Tests ◽  
First Time

A new photon-counting camera based on hybrid pixel technology has been developed at the SOLEIL synchrotron, making it possible to implement pump–probe–probe hard X-ray diffraction experiments for the first time. This application relies on two specific advantages of the UFXC32k readout chip, namely its high frame rate (50 kHz) and its high linear count rate (2.6 × 106 photons s−1 pixel−1). The project involved the conception and realization of the chips and detector carrier board, the data acquisition system, the server with its specific software, as well as the mechanical and cooling systems. This article reports on in-laboratory validation tests of the new detector, as well as on tests performed at the CRISTAL beamline within the targeted experimental conditions. A benchmark experiment was successfully performed, showing the advantages of the pump–probe–probe scheme in correcting for drifts of the experimental conditions.

Equilibrium phase diagram for the system PbO-CaO-CuO

1990 ◽  
Vol 5 (5) ◽  
pp. 929-931 ◽  
Author(s):  
Hitoshi Kitaguchi ◽  
Jun Takada ◽  
Kiichi Oda ◽  
Yoshinari Miura
Keyword(s):  
Eutectic Reaction ◽  
Equilibrium Phase ◽  
Eutectic Point ◽  
Equilibrium Phase Diagram ◽  
X Ray Diffraction ◽  
Subsolidus Phase ◽  
Essential Information ◽  
X Ray ◽  
Subsolidus Phase Equilibrium ◽  
System Phase

In order to obtain essential information on the formation process of the high-Tc phase in the Bi, Pb-Sr-Ca-Cu-O system, phase equilibria in the system PbO-CaO-CuO have been studied, mainly by x-ray diffraction analysis and thermal analysis. Temperature versus composition diagrams were established for the systems PbO-CuO(Cu2O) and PbO(PbO2)–CaO in air. Three invariant points were detected in these systems: a eutectic reaction (PbO + Ca2PbO4 = L) at 847 ± 6°C, a peritectic reaction (Ca2PbO4 = L + CaO) at 980 ± 2°C, and a eutectic reaction (PbO + CuO = L) at 789 ± 3°C. For the system PbO(PbO2)-CaO-CuO, subsolidus phase equilibrium in air was established. The liquidus was also examined at 780, 800, and 820°C, and a ternary (PbO-Ca2PbO4-CuO) eutectic point was detected at 772 ± 6°C.

A new polymorph of bis(2-aminopyridinium) fumarate–fumaric acid (1/1) from powder X-ray diffraction

2013 ◽  
Vol 69 (8) ◽  
pp. 896-900 ◽  
Author(s):  
Shuichao Dong ◽  
Yaqiu Tao ◽  
Xiaodong Shen ◽  
Zhigang Pan
Keyword(s):  
Hydrogen Bonds ◽  
Fumaric Acid ◽  
Diffraction Method ◽  
Monoclinic Space Group ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
Acta Cryst ◽  
Space Group ◽  
X Ray ◽  
Hydrogen Bonded

A new polymorph of bis(2-aminopyridinium) fumarate–fumaric acid (1/1), 2C5H7N2+·C4H2O42−·C4H4O4, was obtained and its crystal structure determined by powder X-ray diffraction. The new polymorph (form II) crystallizes in the triclinic system (space groupP\overline{1}), while the previous reported polymorph [form I; Ballabh, Trivedi, Dastidar & Suresh (2002).CrystEngComm,4, 135–142; Büyükgüngör, Odabaşoğlu, Albayrak & Lönnecke (2004).Acta Cryst.C60, o470–o472] is monoclinic (space groupP21/c). In both forms I and II, the asymmetric unit consists of one 2-aminopyridinium cation, half a fumaric acid molecule and half a fumarate dianion. The fumarate dianion is involved in hydrogen bonding with two neighbouring 2-aminopyridinium cations to form a hydrogen-bonded trimer in both forms. In form II, the hydrogen-bonded trimers are interlinked across centres of inversionviapairs of N—H...O hydrogen bonds, whereas such trimers are joinedviasingle N—H...O hydrogen bonds in form I, leading to different packing modes for forms I and II. The results demonstrate the relevance and application of the powder diffraction method in the study of polymorphism of organic molecular materials.

Sign in / Sign up

Export Citation Format

Share Document