Synthesis, Rietveld Analysis and Solid State Raman Spectroscopy of K4SrSi3O9.

ChemInform ◽  
2006 ◽  
Vol 37 (49) ◽  
Author(s):  
Volker Kahlenberg ◽  
Reinhard Kaindl ◽  
Daniel M. Toebbens
Keyword(s):  
Raman Spectroscopy ◽  
Solid State ◽  
Rietveld Analysis

THE ROLE OF INTERMEDIATE CALCIUM ALUMINATE PHASES IN SOLID STATE SYNTHESIS OF MAYENITE (Ca12Al14O33)

2011 ◽  
Vol 04 (02) ◽  
pp. 183-186 ◽  
Author(s):  
M. RUSZAK ◽  
S. WITKOWSKI ◽  
P. PIETRZYK ◽  
A. KOTARBA ◽  
Z. SOJKA
Keyword(s):  
Raman Spectroscopy ◽  
Solid State ◽  
Low Temperature ◽  
Calcium Aluminate ◽  
Solid State Reaction ◽  
Rietveld Analysis ◽  
Structural Transformations ◽  
Solid State Synthesis

Structural transformations during the synthesis of mayenite ( Ca 12 Al 14 O 33) were investigated. The samples were prepared by a solid–state reaction and the transformations were researched by means of XRD, Rietveld analysis, SEM, and Raman spectroscopy. The three key phases ( CaAl 2 O 4, Ca 3 Al 2 O 6, Ca 5 Al 6 O 14) were identified and their role in the mayenite formation was assigned. The optimal low temperature pathway of the mayenite synthesis involving Ca 5 Al 6 O 14 intermediate was proposed.

Synthesis, Rietveld Analysis and Solid State Raman Spectroscopy of K4SrSi3O9

2006 ◽  
Vol 632 (12-13) ◽  
pp. 2037-2042 ◽  
Author(s):  
Volker Kahlenberg ◽  
Reinhard Kaindl ◽  
Daniel M. Többens
Keyword(s):  
Raman Spectroscopy ◽  
Solid State ◽  
Rietveld Analysis

scholarly journals Impact of Magnesium on the Structure of Aluminoborosilicate Glasses: A Solid‐State NMR and Raman Spectroscopy Study

2021 ◽  
Author(s):  
Nicolas Bisbrouck ◽  
Marco Bertani ◽  
Frédéric Angeli ◽  
Thibault Charpentier ◽  
Dominique de Ligny ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Solid State ◽  
Solid State Nmr ◽  
Spectroscopy Study

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.

Crystallochemistry and structural studies of two newly CaSb0.50Fe1.50(PO4)3 and Ca0.50SbFe(PO4)3 Nasicon phases

2006 ◽  
Vol 21 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Abderrahim Aatiq ◽  
My Rachid Tigha ◽  
Rabia Hassine ◽  
Ismael Saadoune
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Rietveld Analysis ◽  
Structural Studies ◽  
Hexagonal Cell ◽  
Conventional Solid State Reaction ◽  
Space Group ◽  
X Ray ◽  
Cell Parameters ◽  
Crystallographic Structures

Crystallographic structures of two new orthophosphates Ca0.50SbFe(PO4)3 and CaSb0.50Fe1.50(PO4)3 obtained by conventional solid state reaction techniques at 900 °C, were determined at room temperature from X-ray powder diffraction using Rietveld analysis. The two compounds belong to the Nasicon structural family. The space group is R3 for Ca0.50SbFe(PO4)3 and R3c for CaSb0.50Fe1.50(PO4)3. Hexagonal cell parameters for Ca0.50SbFe(PO4)3 and CaSb0.50Fe1.50(PO4)3 are: a=8.257(1) Å, c=22.276(2) Å, and a=8.514(1) Å, c=21.871(2) Å, respectively. Ca2+ and vacancies in {[Ca0.50]3a[◻0.50]3b}M1SbFe(PO4)3 are ordered within the two positions, 3a and 3b, of M1 sites. Structure refinements show also a quasi-ordered distribution of Sb5+ and Fe3+ ions within the Nasicon framework. Thus, in {[Ca0.50]3a[◻0.50]3b}M1SbFe(PO4)3, each Ca(3a)O6 octahedron shares two faces with two Fe3+O6 octahedra and each vacancy (◻(3b)O6) site is located between two Sb5+O6 octahedra. In [Ca]M1Sb0.50Fe1.50(PO4)3 compound (R3c space group), all M1 sites are occupied by Ca2+ and the Sb5+ and Fe3+ ions are randomly distributed within the Nasicon framework.

Planar and Nonplanar Conformations of (meso-Tetraphenylporphinato)nickel(II) in Solution As Inferred from Solution and Solid-State Raman Spectroscopy

1997 ◽  
Vol 101 (32) ◽  
pp. 5789-5798 ◽  
Author(s):  
Walter Jentzen ◽  
Esko Unger ◽  
Xing-Zhi Song ◽  
Song-Ling Jia ◽  
Ilona Turowska-Tyrk ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Solid State

scholarly journals Time-Gated Raman Spectroscopy for Quantitative Determination of Solid-State Forms of Fluorescent Pharmaceuticals

2018 ◽  
Vol 90 (7) ◽  
pp. 4832-4839 ◽  
Author(s):  
Tiina Lipiäinen ◽  
Jenni Pessi ◽  
Parisa Movahedi ◽  
Juha Koivistoinen ◽  
Lauri Kurki ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Solid State ◽  
Quantitative Determination
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