Quantitative analysis of mineralized white Portland clinkers: The structure of Fluorellestadite

2002 ◽  
Vol 17 (4) ◽  
pp. 281-286 ◽  
Author(s):  
Isabel Pajares ◽  
Ángeles G. De la Torre ◽  
Sagrario Martínez-Ramírez ◽  
Francisca Puertas ◽  
María-Teresa Blanco-Varela ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Quantitative Analysis ◽  
Elemental Composition ◽  
Phase Analysis ◽  
Single Phase ◽  
Type Structure ◽  
Phase Content ◽  
Amorphous Phases ◽  
Apatite Type ◽  
Atomic Parameters

Fluorellestadite, Ca10(SiO4)3(SO4)3F2, has been synthesized as single phase. This compound crystallizes in the apatite type structure, s.g. P63/m, with parameters a=9.4417(1) Å, c=6.9396(1) Å and V=535.76(1) Å3. The refinement of its crystal structure converged to RWP=12.33% and RF=4.58%. The atomic parameters have been used to analyze the phase content of mineralized white Portland clinkers. These clinkers contain Ca3SiO5, Ca2SiO4, Ca12Al14O32F2 and Ca10(SiO4)3(SO4)3F2. The agreement between the elemental composition inferred from the Rietveld phase analysis and that measured by XRF is noteworthy. This comparison does not take into account the presence of amorphous phases and unmodeled elemental substitutions in crystalline phases. Similar Rietveld studies on commercial white Portland clinkers are also shown to be feasible.

scholarly journals Synthesis, Structure and Thermophysical Properties of Phosphates MNi0.5Zr1.5(PO4)3 (M = Mg, Ca, Sr)

2010 ◽  
Vol 12 (3,4) ◽  
pp. 241 ◽  
Author(s):  
M.V. Sukhanov ◽  
I.A. Schelokov ◽  
V.I. Pet'kov ◽  
E.R. Gobechiya ◽  
Yu.K. Kabalov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
High Temperature ◽  
Single Phase ◽  
Rietveld Method ◽  
Type Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Expansion Behavior

<p>New phosphates MNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> (M = Mg, Ca, Sr) were prepared by the precipitating method.<strong><em> </em></strong>Phosphates were characterized using X-ray powder diffraction, IR-spectroscopy and electron microprobe analyses. The crystal structure of phosphates was refined by the Rietveld method. Phosphates CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> and SrNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> are shown to have been crystallized in the NaZr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>-type structure and the phosphate MgNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3 </sub>was obtained as a single-phase with Sc<sub>2</sub>(WO<sub>4</sub>)<sub>3</sub>-type structure. Heat capacity of phosphate CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> was measured in the range 7 – 650 K and increased monotonically over the entire temperature range studied. Thermal expansion of phosphate CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> was studied in the interval 295-1073 K by the high temperature X-ray diffraction. This phosphate is similar to the best low-expansion ceramics, such as zircon, cordierite and silica glass in thermal expansion behavior.</p>

Synthesis and Crystal Structure of Pd5InSe

2014 ◽  
Vol 69 (4) ◽  
pp. 417-422 ◽  
Author(s):  
André Götze ◽  
Philipp Urban ◽  
Oliver Oeckler ◽  
Holger Kohlmann
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Phase ◽  
Stoichiometric Composition ◽  
Close Packing ◽  
Type Structure ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
Powder Samples ◽  
The Relationship

Pd5InSe has been prepared from the elements. The use of iodine as a mineralizing agent enables the synthesis of single-phase powder samples as well as of single crystals. Pd5InSe is stable in cold air, but reacts to give Pd, In2O3 and Pd4Se at 400 °C. The crystal structure of Pd5InSe was determined from single-crystal X-ray diffraction data (space group P4=mmm, a = 4.0255(7), c = 6.972(1) Å, z(Pd2) = 0.28111(8)) and belongs to the Pd5TlAs-type structure with full occupation of all atomic sites. EDX analysis on the single crystal (Pd5.0(1)In0.99(3)Se1.0(1)) confirms the stoichiometric composition. The relationship to the cubic close packing (Cu-type structure), which may be visualized by the crystal chemical formula Pd4PdTlAs⃞, is proven by a Bärnighausen symmetry tree.

Study of the magnetic properties and magnetocaloric effects in (Ho0.85RE0.15)3Pd2 (RE=Y and Gd) compounds

2020 ◽  
Vol 34 (11) ◽  
pp. 2050112
Author(s):  
X. F. Wu ◽  
C. Guo ◽  
Y. S. Du ◽  
J. Wang ◽  
L. Ma ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Single Phase ◽  
Magnetic Moments ◽  
Type Structure ◽  
Field Change ◽  
Text Type ◽  
Magnetocaloric Properties ◽  
Second Order Transition ◽  
Curie Temperatures

The crystal structure, magnetic and magnetocaloric properties of the [Formula: see text] (RE=Y and Gd) compounds were investigated. Both of the compounds crystallize in a single phase with a tetragonal [Formula: see text]-type structure (space group [Formula: see text]/mbm) and undergo a second-order transition from ferromagnetic (FM) state to paramagnetic (PM) state. In the PM region, the reciprocal susceptibilities both obey the Curie–Weiss law. The paramagnetic Curie temperatures [Formula: see text] for [Formula: see text] and [Formula: see text] were determined to be 4.9 K and 3.2 K, and the corresponding effective magnetic moments [Formula: see text] are 10.3 [Formula: see text]/RE and 10.5 [Formula: see text]/RE, respectively. Under a field change from 0 T to 5 T, the maximum values of [Formula: see text] for the [Formula: see text] and [Formula: see text] compounds are determined to be [Formula: see text] and [Formula: see text], with the corresponding RC values of [Formula: see text] and [Formula: see text], respectively.

Verfeinerung der Kristallstruktur von Tripalladium-di-tetrathiophospliat Pd3(PS4)2 Refinement of the Crystal Structure of Tripalladium-di-tetrathiophosphate Pda3(PS4)2

1983 ◽  
Vol 38 (4) ◽  
pp. 426-427 ◽  
Author(s):  
Arndt Simon ◽  
Karl Peters ◽  
Harry Hahn
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Title Compound ◽  
Type Structure ◽  
Tetrahedral Symmetry ◽  
X Ray ◽  
X Ray Crystallography ◽  
Planar Environment

Abstract The structure of the title compound has been determined by X-ray crystallography. The title compound is synthesized from the elements at 600 °C. Its crystal structure, derived from powder data [3] is refined by single crystal diffractometer data. The structure is trigonal (P3̅ml, α = 684.1(1), c = 724.4(1) pm); Pd2+ cations and PS43- anions form a network with an anti-Claudetite (AS2O3) type structure. The PS4 units are distinctly distorted from ideal tetrahedral symmetry. The Pd atoms have a planar environment of 4 S atoms.

Luminescence Intensity Enhancement of Copper Doped Hydronium Alunite Synthesized under Hydrothermal Conditions Using Sulfates Solution

2014 ◽  
Vol 90 ◽  
pp. 127-132
Author(s):  
Yuichiro Kuroki ◽  
Takashi Hatsuse ◽  
Tomoichiro Okamoto ◽  
Masasuke Takata
Keyword(s):  
Crystal Structure ◽  
Luminescence Intensity ◽  
Single Phase ◽  
Elemental Sulfur ◽  
Nitrate Solution ◽  
Hydrothermal Condition ◽  
Copper Nitrate ◽  
Hydrothermal Conditions ◽  
Photoluminescence Peak ◽  
Blue Photoluminescence

A novel phosphor, copper doped hydronium alunite ((H3O)Al3(SO4)2(OH)6:Cu), exhibiting a blue photoluminescence peak at a wavelength of 420 nm was successfully synthesized from aluminum and copper sulfates solution under hydrothermal condition (240 °C, 60 min). The measurement of XRD revealed that the obtained products were single phase with a crystal structure of (H3O)Al3(SO4)2(OH)6. Luminescence intensity of (H3O)Al3(SO4)2(OH)6:Cu synthesized from sulfates solution was 6.2 times higher than that from an aluminum nitrate solution mixed with an elemental sulfur and a copper nitrate solution. The increase of luminescence intensity was resulted from an improvement of the crystallinity of (H3O)Al3(SO4)2(OH)6.

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