The Synthesis of Ce-Filled CoSb3 and Characterization of its Magnetic and Structural Properties

2003 ◽  
Vol 793 ◽  
Author(s):  
Arwyn L. E. Smalley ◽  
Brandon Howe ◽  
David C. Johnson
Keyword(s):  
Low Temperatures ◽  
Magnetic Measurements ◽  
Rietveld Analysis ◽  
X Ray Diffraction ◽  
Electrical Measurements ◽  
X Ray ◽  
Ferromagnetic Component ◽  
Phase Pure ◽  
Powder Samples

ABSTRACTA series of cerium-containing CoSb3 samples were synthesized, with cerium quantities varying from 0 to 2 stoichiometric equivalents. These samples were annealed at low temperatures to crystallize the kinetically stable phases CexCo4Sb12 (x = 0–0.5). X-ray diffraction showed that these samples were phase pure, and Rietveld analysis on x-ray diffraction data from powder samples indicated that these samples were 25–88% crystalline. Electrical measurements showed that these samples are n-type, which was previously unknown in CexCo4Sb12. Magnetic measurements showed that the samples were paramagnetic due to the cerium being incorporated into the diamagnetic CoSb3 compound. In addition, they contained a ferromagnetic component that was attributed to the amorphous, cerium-containing phase.

Zum System Ca/Mo/O: Phasendiagramm, Synthese und Charakterisierung der ternären Verbindungen / On the System Ca/Mo/O: Phase Diagram, Synthesis and Characterization of Ternary Compounds

1997 ◽  
Vol 52 (10) ◽  
pp. 1169-1174 ◽  
Author(s):  
U. Steiner ◽  
W. Reichelt
Keyword(s):  
Phase Diagram ◽  
Rietveld Analysis ◽  
Solid State Reactions ◽  
Monoclinic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ternary Compounds ◽  
Powder Samples ◽  
O Phase

The phase diagram of the ternary system Ca/Mo/O has been determined. Powder samples of the ternary compounds CaMoO4, CaMoO3, CaMo5O8, Ca16.5Mo13.5O40 and Ca5.45Mo18O32 were prepared by solid state reactions. Rietveld analysis based on powder X-ray diffraction data shows that the compound CaMo5O8 has monoclinic structure (P21/c) with a = 7.549, b = 9.064, c = 9.974 Å, β = 110.04°. CaMo5O8, Ca16.5Mo13.5O40 and Ca5.45Mo18O32 are semiconductors over the temperature range 75 to 300 K.

In situ characterization of strain-induced crystallization of natural rubber by synchrotron radiation wide-angle X-ray diffraction: construction of a crystal network at low temperatures

Soft Matter ◽  
2019 ◽  
Vol 15 (4) ◽  
pp. 734-743 ◽  
Author(s):  
Pinzhang Chen ◽  
Jingyun Zhao ◽  
Yuanfei Lin ◽  
Jiarui Chang ◽  
Lingpu Meng ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Structural Evolution ◽  
X Ray Diffraction ◽  
In Situ Characterization ◽  
X Ray ◽  
Crystal Network ◽  
Strain Induced Crystallization ◽  
Induced Crystallization

The structural evolution of NR during stretching at −40 °C and in the strain–temperature space.

Characterization of nickel catalysts by chemisorption techniques, x-ray diffraction and magnetic measurements

1989 ◽  
Vol 46 (2) ◽  
pp. 281-296 ◽  
Author(s):  
C. Hoang-Van ◽  
Y. Kachaya ◽  
S.J. Teichner ◽  
Y. Arnaud ◽  
J.A. Dalmon
Keyword(s):  
Magnetic Measurements ◽  
Nickel Catalysts ◽  
X Ray Diffraction ◽  
X Ray

Site occupancy in richterite-winchite from Libby, Montana, USA, by FTIR spectroscopy

2007 ◽  
Vol 71 (1) ◽  
pp. 93-104 ◽  
Author(s):  
G. Iezzi ◽  
G. Della Ventura ◽  
F. Bellatreccia ◽  
S. Lo Mastro ◽  
B. R. Bandli ◽  
...  
Keyword(s):  
Microprobe Analysis ◽  
Structure Refinement ◽  
Site Occupancy ◽  
Rietveld Analysis ◽  
Published Data ◽  
X Ray Diffraction ◽  
Cation Site ◽  
X Ray ◽  
Powder Samples ◽  
Frequency Components

AbstractThree natural amphibole samples collected from the former vermiculite mine near Libby, Montana. USA, have been analysed by Rietveld X-ray powder diffraction (XRPD) refinement and Fourier transform infrared spectroscopy (FTIR) in the OH-stretching region. The same materials have been analysed previously by electron microprobe analysis (EMPA), Mössbauer spectroscopy and structure refinement (SREF) single crystal X-ray diffraction (SC-XRD), which revealed that these amphiboles have a crystal chemical formula very close to an intermediate composition between winchite and richterite, i.e. AA0.5BNaCaCMg4.5M3+T0.5Si8O22(OH)2 (A = Na and/or K; M3+ = Fe3+ and/or Al). The Rietveld analysis showed the powder samples used for the experiments here to be composed only of amphibole. This in turn allowed us to use FTIR OH-stretching data to derive cation ordering on these powder samples. The three FTIR spectra are quite similar and up to four components can be fitted to the patterns. The two lower-frequency components (labelled A and B) can be attributed to a local O(3)-H dipole surrounded by M(1)M(3)Mg3 and M(1)M(3)Mg2Fe2+; (respectively), an empty A site and rSi8 environments; on the contrary, the higher-frequency C and D bands indicate the presence of an occupied A site. The FTIR OH-stretching data alone allow us to calculate the site occupancy of the A, M(1)–M(3) and T sites with confidence, as compared with previously published data. By contrast M(4)- and M(2)-site occupancies are more difficult to evaluate. This study takes advantage of the large database of well characterized synthetic amphiboles, built over the last two decades. The comparison of vibrational spectroscopy data with micro-chemical and crystallographic data reported in this study demonstrate that the FTIR OH-stretching method alone is a valuable and rapid method to derive or at least sensibly constrain site occupancy for natural amphiboles. A much more detailed cation site occupancy can be obtained by combining micro-chemical and FTIR OH-stretching data.

Darstellung und Charakterisierung von Berlinerblau-Analoga des Typs Ti[MB(CN)6] / Preparation and Characterization of Prussian Blue Analogs of the Type Ti[MB(CN)6]

1984 ◽  
Vol 39 (2) ◽  
pp. 185-188 ◽  
Author(s):  
Hidenari Inoue ◽  
Ekkehard Fluck
Keyword(s):  
Magnetic Measurements ◽  
Three Dimensional ◽  
Photoelectron Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cyanide Ligand ◽  
Cubic System ◽  
Prussian Blue Analogs ◽  
Back Donation

Three compounds of the type Ti[MB(CN)6] (MB = Co, Rh, and Ir) have been synthesized and characterized by means of their X-ray diffraction powder patterns, magnetic measurements, infrared, electronic, and X-ray photoelectron spectra. All compounds crystallize in the facecentered cubic system and form a three-dimensional framework of two octahedral coordination units MBC6 and TiN6. Upon the formation of Ti[MB(CN)6] from the corresponding potassium salt, the π back-donation in the [MB(CN)6]3- moiety is enhanced by the bridge formation through the cyanide ligand

K2FeIII0.5TiIII0.5TiIV1.0(PO4)3: Preparation and Characterization of a Langbeinite-related Phosphate Containing Iron(III) and Mixed-valent Titanium

2008 ◽  
Vol 63 (3) ◽  
pp. 261-266 ◽  
Author(s):  
Ivan V. Ogorodnyk ◽  
Igor V. Zatovsky ◽  
Vyacheslav N. Baumer ◽  
Nikolay S. Slobodyanik ◽  
Oleg V. Shishkin ◽  
...  
Keyword(s):  
Cell Parameter ◽  
Magnetic Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Valence States ◽  
Dark Violet ◽  
Cubic System ◽  
Structure Investigations ◽  
3D Framework

A potassium mixed iron(III)-titanium(III)-titanium(IV) phosphate K2FeIII0.5TiIII0.5TiIV1.0(PO4)3 has been obtained using a two-step flux interaction in evacuated sealed silica tubes. It forms tetrahedrally-shaped dark violet crystals which belong to the cubic system (space group P213) with the cell parameter a = 9.8592(5) Å . The structure was refined from single-crystal X-ray diffraction data. [MO6] octahedra and [PO4] tetrahedra share their vertices forming a rigid 3D framework. The potassium cations are located in large closed cavities of the framework. A distribution of the 3d metals’ valence states in K2FeIII0.5TiIII0.5TiIV1.0(PO4)3 has been proposed on the basis of magnetic measurements, structure investigations and bond-valence calculations as well as UV/vis and EPR spectroscopy.

Phase Transformation of Biphasic Granules of Gypsum and Carbonated Apatite at Low Temperatures

2016 ◽  
Vol 1133 ◽  
pp. 50-54 ◽  
Author(s):  
Siti Noorzidah Mohd Sabri ◽  
Syazana Abu Bakar ◽  
Abdul Yazid Abdul Manaf ◽  
Siti Farhana Hisham ◽  
Mohamad Azmirruddin Ahmad ◽  
...  
Keyword(s):  
Cross Section ◽  
Low Temperatures ◽  
Carbonate Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbonated Apatite ◽  
Infra Red ◽  
Different Temperatures ◽  
Bone Apatite

The purpose of this study was to prepare biphasic granules containing gypsum and carbonated apatite at low temperatures. The biphasic granules were prepared using dissolution-precipitation technique at three different temperatures 30°C, 40°C and 50°C. Characterization of the biphasic granules was determined by multiple analytical methods such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infra-red (FTIR), and CHN Analysis. The obtained granules were determined by XRD as biphasic granules containing bone apatite and gypsum. The cross-section of biphasic granules was observed by SEM. The formed bone apatite was identified as B-Type carbonated apatite using FTIR The carbonate content in biphasic granules fabricated at 30°C, 40°C and 50°C were recorded by CHN analysis as 5.0 wt%, 6.1 wt% and 6.25 wt%, respectively.

Preparation of Ti2CuAl5 by Reactive Sintering

1988 ◽  
Vol 133 ◽  
Author(s):  
Arnulf J Maeland ◽  
Dave Narasimhan
Keyword(s):  
Intermetallic Compound ◽  
Intermetallic Compounds ◽  
Low Temperatures ◽  
Nickel Aluminides ◽  
Reactive Sintering ◽  
X Ray Diffraction ◽  
X Ray ◽  
New Process ◽  
Microhardness And Microstructure

ABSTRACTThe exothermic formation of intermetallic compounds from the constituent powders through reactive sintering at relatively low temperatures is a promising new process being explored for the preparation of nickel aluminides. The process is useful for synthesis of other intermetallics as well.We describe here the preparation of Ti2CuAl5 using the technique of reactive sintering. This intermetallic compound has a L12 structure which is also the structure of the very interesting Ni3Al intermetallic. Characterization of the Ti2CuAl5 phase is done by x-ray diffraction, microhardness, and microstructure.

Synthesis and Characterization of Inorganic Clathrate-II Materials

2007 ◽  
Vol 1044 ◽  
Author(s):  
Matt Beekman ◽  
George S. Nolas
Keyword(s):  
Electrical Transport ◽  
Structural Response ◽  
Rietveld Analysis ◽  
Synthesis And Characterization ◽  
Type Ii ◽  
X Ray Diffraction ◽  
X Ray ◽  
New Type ◽  
Silicon And Germanium

AbstractPreliminary results from an investigation into the synthesis and characterization of silicon and germanium type II clathrates are reported. A series of NaxSi136 (0 < x < 24) clathrates was synthesized and characterized by powder X-ray diffraction and Rietveld analysis. The NaxSi136 lattice parameters are observed to first decrease, then increase with increasing Na content, indicating a non-monotonic structural response to Na filling. New type II Ge clathrate compositions Cs8Na16MyGe136-y (M = Cu, In) utilizing framework substitution are reported. Electrical transport measurements on a Cu substituted specimen indicate framework substitution modifies the transport properties of these materials. The potential type II clathrate phases possess for thermoelectric applications is discussed.

Sign in / Sign up

Export Citation Format

Share Document