scholarly journals CHARACTERIZATION OF WHITE PORTLAND CEMENT GRINDED FOR A LONG TIME BY USING X-RAY POWDER DIFFRACTION AND 29Si NMR SPECTROSCOPY

2014 ◽  
Vol 68 (1) ◽  
pp. 30-37 ◽  
Author(s):  
Tomotaka AWAMURA ◽  
Toyoharu NAWA
Keyword(s):  
Nmr Spectroscopy ◽  
Portland Cement ◽  
Powder Diffraction ◽  
X Ray ◽  
Long Time ◽  
White Portland Cement

Characterization of a New Hexasodium Diphosphopentamolybdate Hydrate, Na6[P2Mo5O23]·7H2O, by23Na MQMAS NMR Spectroscopy and X-ray Powder Diffraction

2000 ◽  
Vol 39 (18) ◽  
pp. 4130-4136 ◽  
Author(s):  
Jørgen Skibsted ◽  
Michael Brorson ◽  
Jørgen Villadsen ◽  
Hans J. Jakobsen
Keyword(s):  
Nmr Spectroscopy ◽  
Powder Diffraction ◽  
X Ray

Characterization of a Polyanhydride Series by Ftir

1993 ◽  
Vol 331 ◽  
Author(s):  
Mark R. Kreitz ◽  
Kathleen J. Pekarek ◽  
Edith Mathiowitz
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Ftir Spectroscopy ◽  
Powder Diffraction ◽  
Sebacic Acid ◽  
X Ray ◽  
Fingerprint Region

AbstractUsing Fourier-transform infrared (FTIR) spectroscopy we have characterized a polyanhydride copolymer series composed of various ratios of the diacids 1,3-bis(p -carboxyphenoxy)propane (CPP) and sebacic acid (SA). Typical peaks corresponding to the aliphatic-aliphatic (SA-SA), aromatic-aliphatic (CPP-SA), and aromatic-aromatic (CPP-CPP) diads were found in the 1820- 1710 cm−1 wavenumber range. Further peaks corresponding to the SA-SA diads were identified in the fingerprint region at 1382, 1360, 1307, and 1286 cm−1. These peak characterizations facilitate identification of bond distribution in the CPP-SA copolymer as well as other polyanhydride copolymers, and correlate well with previously presented information obtained with nuclear magnetic resonance (NMR) spectroscopy and X-ray powder diffraction.

New horizons for the structural characterization of stainless steel slags by X-ray powder diffraction

2007 ◽  
Vol 2007 (suppl_26) ◽  
pp. 61-66 ◽  
Author(s):  
B. Peplinski ◽  
B. Adamczyk ◽  
G. Kley ◽  
K. Adam ◽  
F. Emmerling ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Powder Diffraction ◽  
Structural Characterization ◽  
X Ray ◽  
New Horizons

scholarly journals Synthesis, characterization and modeling of self-assembled porphyrin nanorods

2019 ◽  
Vol 23 (11n12) ◽  
pp. 1346-1354 ◽  
Author(s):  
Danielle Laurencin ◽  
Pascal G. Yot ◽  
Christel Gervais ◽  
Yannick Guari ◽  
Sébastien Clément ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Dft Calculations ◽  
Powder Diffraction ◽  
Solid State Nmr ◽  
Molecular Level ◽  
Ion Association ◽  
Free Base ◽  
X Ray ◽  
Solid State Nmr Spectroscopy

Porphyrin nanorods were prepared by ion-association between free-base meso 5,10,15,20-tetrakis-(4-[Formula: see text]-methylpyridinium)porphyrin cations and tetraphenylborate anions. The nanorods have variable lengths (up to a few micrometers long) and diameters ([Formula: see text]50–500 nm). Their structure at the molecular level was elucidated by combining multinuclear solid state NMR spectroscopy, synchrotron X-ray powder diffraction and DFT calculations.

Distorted chiolite crystal structures of α-Na5M3F14 (M=Cr,Fe,Ga) studied by X-ray powder diffraction

2003 ◽  
Vol 18 (2) ◽  
pp. 128-134 ◽  
Author(s):  
A. Le Bail ◽  
A.-M. Mercier
Keyword(s):  
Crystal Structures ◽  
Powder Diffraction ◽  
Room Temperature ◽  
Rietveld Refinements ◽  
Space Group ◽  
X Ray ◽  
Precise Characterization

The crystal structures of the chiolite-related room temperature phases α-Na5M3F14 (MIII=Cr,Fe,Ga) are determined. For all of them, the space group is P21/n, Z=2; a=10.5096(3) Å, b=7.2253(2) Å, c=7.2713(2) Å, β=90.6753(7)° (M=Cr); a=10.4342(7) Å, b=7.3418(6) Å, c=7.4023(6) Å, β=90.799(5)° (M=Fe), and a=10.4052(1) Å, b=7.2251(1) Å, c=7.2689(1), β=90.6640(4)° (M=Ga). Rietveld refinements produce final RF factors 0.036, 0.033, and 0.035, and RWP factors, 0.125, 0.116, and 0.096, for MIII=Cr, Fe, and Ga, respectively. The MF6 polyhedra in the defective isolated perovskite-like layers deviate very few from perfect octahedra. Subtle octahedra tiltings lead to the symmetry decrease from the P4/mnc space group adopted by the Na5Al3F14 chiolite aristotype to the P21/n space group adopted by the title series. Facile twinning precluded till now the precise characterization of these compounds.

Structural characterization of two K2SnX(PO4)3 (X=Fe,Yb) with langbeinite structure

2006 ◽  
Vol 21 (3) ◽  
pp. 214-219 ◽  
Author(s):  
Abderrahim Aatiq ◽  
Btissame Haggouch ◽  
Rachid Bakri ◽  
Youssef Lakhdar ◽  
Ismael Saadoune
Keyword(s):  
Solid State ◽  
Powder Diffraction ◽  
Room Temperature ◽  
Cell Parameter ◽  
Rietveld Analysis ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Octahedral Sites ◽  
Parameter Values

Structures of two K2SnX(PO4)3(X=Fe,Yb) phosphates, obtained by conventional solid state reaction techniques at 950 °C, were determined at room temperature by X-ray powder diffraction using Rietveld analysis. The two materials exhibit the langbeinite-type structure (P213 space group, Z=4). Cubic unit cell parameter values are: a=9.9217(4) Å and a=10.1583(4) Å for K2SnFe(PO4)3 and K2SnYb(PO4)3, respectively. Structural refinements show that the two crystallographically independent octahedral sites (of symmetry 3) have a mixed Sn∕X (X=Fe,Yb) population although ordering is stronger in the Yb phase than in the Fe phase.

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