scholarly journals Magnetic, Structural and Spectroscopic Properties of Iron(II)-Octacyanoniobate(IV) Crystalline Film Obtained by Ion-Exchange Synthesis

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3029
Author(s):  
Wojciech Sas ◽  
Dawid Pinkowicz ◽  
Marcin Perzanowski ◽  
Magdalena Fitta
Keyword(s):  
Thin Film ◽  
Ion Exchange ◽  
Coercive Field ◽  
Magnetic Measurements ◽  
Film Formation ◽  
Spectroscopic Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
First Time

Over recent years, investigations of coordination polymer thin films have been initiated due to their unique properties, which are expected to be strongly enhanced in the thin film form. In this work, a crystalline [FeII(H2O)2]2[NbIV(CN)8]∙4H2O (1) film on a transparent Nafion membrane was obtained, for the first time, via ion-exchange synthesis. The proper film formation and its composition was confirmed with the use of energy dispersive X-ray spectroscopy and infrared spectroscopy, as well as in situ Ultraviolet-Visible (UV-Vis) spectroscopy. The obtained film were also characterized by scanning electron microscopy, X-ray diffraction, and magnetic measurements. The [FeII(H2O)2]2[NbIV(CN)8]∙4H2O film shows a sharp phase transition to a long-range magnetically ordered state at Tc = 40 K. The 1 film is a soft ferromagnet with the coercive field Hc = 1.2 kOe. Compared to the bulk counterpart, a decrease in critical temperature and a significant increase in the coercive field were observed in the films indicating a distinct size effect. The decrease in Tc could also have been related to the possible partial oxidation of FeII ions to FeIII, which could be efficient, due to the large surface of the thin film sample.

scholarly journals Structural and Magnetic Properties of FePd Thin Film Synthesized by Electrodeposition Method

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1454
Author(s):  
Gabriele Barrera ◽  
Federico Scaglione ◽  
Matteo Cialone ◽  
Federica Celegato ◽  
Marco Coïsson ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Magnetic Properties ◽  
Deposition Time ◽  
Magnetic Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fundamental Properties ◽  
Magnetic Features ◽  
Application Fields

Bimetallic nanomaterials in the form of thin film constituted by magnetic and noble elements show promising properties in different application fields such as catalysts and magnetic driven applications. In order to tailor the chemical and physical properties of these alloys to meet the applications requirements, it is of great importance scientific interest to study the interplay between properties and morphology, surface properties, microstructure, spatial confinement and magnetic features. In this manuscript, FePd thin films are prepared by electrodeposition which is a versatile and widely used technique. Compositional, morphological, surface and magnetic properties are described as a function of deposition time (i.e., film thickness). Chemical etching in hydrochloric acid was used to enhance the surface roughness and help decoupling crystalline grains with direct consequences on to the magnetic properties. X-ray diffraction, SEM/AFM images, contact angle and magnetic measurements have been carried out with the aim of providing a comprehensive characterisation of the fundamental properties of these bimetallic thin films.

Ferroelectric properties in all solution prepared Bi6Fe2Ti3O18/Ba0.92La0.08SnO3 thin films

2016 ◽  
Vol 30 (35) ◽  
pp. 1650394
Author(s):  
Li Zhang ◽  
Yibao Li ◽  
Zhen Tang ◽  
Yan Deng ◽  
Hui Yuan ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Coercive Field ◽  
Ferroelectric Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transparent Conducting ◽  
Scanning Electron

In this paper, all solution processing is used to prepare both the transparent conducting Ba[Formula: see text]La[Formula: see text]SnO3 (BLSO) thin films as bottom electrodes and ferroelectric Bi6Fe2Ti3O[Formula: see text] (BFTO) thin films. The derived BFTO thin films are characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM). The derived thin film is polycrystalline with dense microstructures. The remnant polarization [Formula: see text] at the measurement frequency of 2 kHz can reach [Formula: see text] under the 500 kV/cm electric field and the coercive field [Formula: see text] is 410 kV/cm. The results will provide a feasible route to prepare BFTO thin films on transparent conducting bottom electrodes to realize multifunctionality.

A novel low k thin film based on plasma-polymerized 1- cyano isoquinoline

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Zhao Xiong-Yan ◽  
Wang Ming-Zhu ◽  
Wang Zhi
Keyword(s):  
Thin Film ◽  
Photoelectron Spectroscopy ◽  
Film Formation ◽  
Ring Structure ◽  
Discharge Power ◽  
Low Dielectric Constant ◽  
X Ray ◽  
Low Dielectric ◽  
First Time ◽  
Low K

AbstractA novel low dielectric constant polymer, plasma-polymerized 1-cyano isoquinoline (PPCIQ) was prepared by plasma polymerization for the first time. The structure and surface compositions of the deposited PPCIQ thin films were investigated by Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). The results show that a high retention of the aromatic ring structure of the starting monomer in the deposited plasma films is obtained when a low discharge power of 15 W was used during film formation. In the case of higher discharge power of 35 W, more severe monomer molecular fragmentation can be observed. The dielectric properties measurements show that a low dielctric constant of 2.62 can be obtained for PPCIQ thin film deposited at 15 W.

Replacing nano-clay for kaolin in ultramarine pigments

2013 ◽  
Vol 43 (1) ◽  
pp. 1-7
Author(s):  
Vahideh Tajer Kajinebaf ◽  
Fereshteh Rezaeian ◽  
Masoud Rajabi ◽  
Saeid Baghshahi
Keyword(s):  
Raw Materials ◽  
X Ray Diffraction ◽  
Arabic Gum ◽  
Content Type ◽  
Calcined Clay ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Nano Clay ◽  
Ultramarine Pigments ◽  
First Time

Purpose – Replacing nano-clay for kaolin in ultramarine pigments was investigated. The paper aims to discuss these issues. Design/methodology/approach – Ultramarine pigments with both kaolin and nano-clay were synthesized by traditional method. For this purpose, mixing of the raw materials consisted of calcined clay, sulfur, sodium hydroxide and Arabic gum was milled and then calcined at 800°C for 9 h under controlled atmosphere. The characterization was carried out by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), UV-vis spectroscopy, colorimetery (CIELab method) and dynamic light scattering (DLS) techniques. Findings – The investigations show that using nano-clay results in richer pigments. XRD results reveal that the ultramarine phase formation is enhanced by using nano-clay. SEM and DLS results also confirm that the ultramarine pigment synthesized by using nano-clay has smaller particles than that prepared by kaolin. Originality/value – In this research, for the first time, nano-clay was substituted for kaolin to synthesized ultramarine pigment.

A new disordered langbeinite-type compound, K2Tb1.5Ta0.5P3O12, and Eu3+-doped multicolour light-emitting properties

2019 ◽  
Vol 75 (2) ◽  
pp. 213-220 ◽  
Author(s):  
Ya-Li Xue ◽  
Dan Zhao ◽  
Shi-Rui Zhang ◽  
Ya-Nan Li ◽  
Yan-Ping Fan
Keyword(s):  
Three Dimensional ◽  
Spectroscopic Properties ◽  
Energy Transfer Mechanism ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
First Time ◽  
Uv Excitation ◽  
The Eu

For the first time, a new langbeinite-type phosphate, namely potassium terbium tantalum tris(phosphate), K2Tb1.5Ta0.5(PO4)3, has been prepared successfully using a high-temperature flux method and has been structurally characterized by single-crystal X-ray diffraction. The results show that its structure can be described as a three-dimensional open framework of [Tb1.5Ta0.5(PO4)3]∞ interconnected by K+ ions. The TbIII and TaV cations in the structure are disordered and occupy the same crystallographic sites. The IR spectrum, the UV–Vis spectrum, the morphology and the Eu3+-activated photoluminescence spectroscopic properties were studied. A series of Eu3+-doped phosphors, i.e. K2Tb1.5–x Ta0.5(PO4)3:xEu3+ (x = 0.01, 0.03, 0.05, 0.07, 0.10), were prepared via a solid-state reaction and the photoluminescence properties were studied. The results show that under near-UV excitation, the luminescence colour can be tuned from green through yellow to red by simply adjusting the Eu3+ concentration from 0 to 0.1, because of the efficient Tb3+→Eu3+ energy-transfer mechanism.

Baeyer-Villiger Reaction of Adamantanone over Sn-Containing Hydrotalcite-Like Catalysts

2007 ◽  
Vol 119 ◽  
pp. 163-166 ◽  
Author(s):  
Zhi Qiang Yang ◽  
Sang Eon Park
Keyword(s):  
Hydrogen Peroxide ◽  
Ion Exchange ◽  
Direct Synthesis ◽  
Xrd Analysis ◽  
Catalytic Performance ◽  
X Ray Diffraction ◽  
Exchange Method ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Ion Exchange Method

Sn-containing hydrotalcite-like compounds were prepared by three different methods such as (i) direct synthesis, (ii) ion-exchange and (iii) grafting. These catalysts were proved to have framework Sn species by powder X-ray diffraction (XRD) analysis and UV-vis spectroscopy. The catalysts prepared by three methods were found to be active and selective for the liquid phase Baeyer–Villiger (BV) oxidation of admantonone using hydrogen peroxide (H2O2) as an oxidant and acetonitrile as a solvent. The Sn-hydrotalcite-like catalysts prepared by ion-exchange method exhibited better catalytic performance than the catalysts prepared by other two methods. Among the ion-exchanged hydrotalacite-like catalysts, 3% Sn ion-exchanged hydrotalcite exhibited superior activity at 30% conversion and 100% selectivity.

Low-dimensional compounds containing cyanide groups. XXV. Synthesis, spectroscopic properties and crystal structures of two ionic iron(II) complexes with tricyanomethanide: tris(1,10-phenanthroline-κ2 N,N′)iron(II) bis(tricyanomethanide) and tris(2,2′-bipyridine-κ2 N,N′)iron(II) bis(tricyanomethanide) sesquihydrate

2014 ◽  
Vol 70 (5) ◽  
pp. 432-436 ◽  
Author(s):  
Ivan Potočňák ◽  
Lucia Váhovská ◽  
Peter Herich
Keyword(s):  
Hydrogen Bonds ◽  
Spectroscopic Properties ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
Aromatic Rings ◽  
X Ray ◽  
Distorted Octahedral ◽  
Vis Spectroscopy ◽  
Ionic Iron ◽  
Low Dimensional

Two new diamagnetic coordination compounds, [Fe(phen)3][C(CN)3]2, (I), and [Fe(bpy)3][C(CN)3]2·1.5H2O, (II), have been synthesized and characterized by single-crystal X-ray diffraction analysis, and IR and UV–Vis spectroscopy (phen is 1,10-phenanthroline, C12H8N2, and bpy is 2,2′-bipyridine, C10H8N2). Both compounds are ionic with distorted octahedral [Fe(phen)3]2+ or [Fe(bpy)3]2+ complex cations, with average Fe—N distances of 1.977 (2) and 1.971 (3) Å, respectively, and two uncoordinated planar tricyanomethanide, or [C(CN)3]−, counter-anions balancing the positive charges of the cations. Solvent water molecules and tcm anions in (II) are linked via O—H...N hydrogen bonds into negatively charged layers and the interlayer space is filled by [Fe(bpy)3]2+ cations. The structures of (I) and (II) are stabilized by π–π interactions between the stacked aromatic rings of the phen ligands of two adjacent cations and by O—H...N hydrogen bonds, respectively, and also by π–π stacking interactions between phen and tcm units in (I).

Synthesis, Crystal Structure and Magnetic Properties of a Mn(II) Fluorenedicarboxylate Complex

2013 ◽  
Vol 68 (9) ◽  
pp. 1015-1020 ◽  
Author(s):  
Xiu-Hua Zhao ◽  
Ya-Yun Zhao ◽  
Mei-Qin Zha ◽  
Xing Li
Keyword(s):  
Single Crystal ◽  
Magnetic Measurements ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
Coupling Behavior ◽  
Vis Spectroscopy ◽  
Metal Organic

A new Mn(II) metal-organic framework, [Mn(DFDC)(phen)]n (1) (where H2DFDC=9,9- diethylfluorene-2,7-dicarboxylic acid, phen=1,10-phenanthroline), was solvothermally synthesized and characterized by single-crystal and powder X-ray diffraction (PXRD), elemental and thermal analysis, IR, UV=Vis spectroscopy, fluorescence and magnetic measurements. Single-crystal X-ray analysis reveals that 1 exhibits a three-dimensional coordination polymer structure. The compound crystallizes in the orthorhombic space group Pnna with a=9.1215(9), b=26.436(3), c=10.2428(10) Å, V =2469.9(4) Å3, Z =4, final wR2=0.1323 for 2825 reflections. The Mn(II) ion is coordinated by four oxygen atoms from four different H2DFDC ligands and two nitrogen atoms from one phen ligand in an octahedral coordination geometry. The compound shows ferromagnetic coupling behavior and has high thermal stability up to 420 °C

Upgrade of laser pump time-resolved X-ray probes in Beijing synchrotron

2019 ◽  
Vol 26 (6) ◽  
pp. 2075-2080
Author(s):  
Can Yu ◽  
Yan Zhang ◽  
Ge Lei ◽  
Hao Wang ◽  
Yu-hang Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Structural Changes ◽  
High Efficiency ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Laser Pump ◽  
Acquisition Scheme ◽  
First Time ◽  
X Ray Absorption

The upgrade of the laser pump time-resolved X-ray probes, namely time-resolved X-ray absorption spectroscopy (TR-XAS) and X-ray diffraction (TR-XRD), implemented at the Beijing Synchrotron Radiation Facility, is described. The improvements include a superbunch fill, a high-efficiency fluorescence collection, an efficient spatial overlap protocol and a new data-acquisition scheme. After upgrade, the adequate TR-XAS signal is now obtained in a 0.3 mM solution, compared with a 6 mM solution in our previous report. Furthermore, to extend application in photophysics, the TR-XAS probe is applied on SrCoO2.5 thin film. And for the first time, TR-XAS is combined with TR-XRD to simultaneously detect the kinetic trace of structural changes in thin film.

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