scholarly journals Crystal Chemistry of an Erythrite-Köttigite Solid Solution (Co3–xZnx) (AsO4)2·8H2O

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 548
Author(s):  
Justyna Ciesielczuk ◽  
Mateusz Dulski ◽  
Janusz Janeczek ◽  
Tomasz Krzykawski ◽  
Joachim Kusz ◽  
...  
Keyword(s):  
Solid Solution ◽  
Energy Dispersive Spectrometer ◽  
Substitutional Solid Solution ◽  
Relative Increase ◽  
Ore Deposit ◽  
X Ray ◽  
Sw Poland ◽  
Wide Compositional Range ◽  
Polymetallic Ore ◽  
Zn Ions

A wide compositional range, covering about 90% of an expected erythrite-köttigite substitutional solid solution with extreme compositions of (Co2.84Mg0.14Zn0.02) (AsO4)2·8H2O and (Zn2.74Co0.27) (AsO4)2·8H2O, was revealed in a suite of samples from a polymetallic ore deposit in Miedzianka, SW Poland. Members of the solid solution series were examined by means of Electron Probe Microanalysis (EPMA), Scanning Electron Microscopy (SEM)/Energy-Dispersive Spectrometer (EDS), X-ray single-crystal and powder diffraction, and Raman spectroscopy. Metal cations were randomly distributed between two special octahedral sites in the erythrite–köttigite structure. In response to Co ↔ Zn substitutions, small but significant changes in bond distances (particularly in [AsO4] tetrahedra), rotation, and distortion of co-ordination polyhedra were observed. Two sub-series of dominant cationic substitutions (Co-Mg-Ni and Co-Fe-Zn) were noted within the arsenate series of vivianite-group minerals linked by erythrite. The paragenetic sequence erythrite → Zn-rich erythrite → Co-rich köttigite → köttigite reflects the evolution of the solution’s pH towards increased acidity and a relative increase in the concentration of Zn ions following precipitation of erythrite.

Preparation and characterization of a novel solid solution of aluminum in tungsten carbide by mechanically activated high-temperature reaction

2006 ◽  
Vol 21 (7) ◽  
pp. 1700-1703 ◽  
Author(s):  
Junmin Yan ◽  
Xianfeng Ma ◽  
Wei Zhao ◽  
Huaguo Tang ◽  
Changjun Zhu ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Substitutional Solid Solution ◽  
Phase Identification ◽  
Temperature Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cell Parameters ◽  
High Temperature Reaction

In this work, a novel substitutional solid solution (W0.8Al0.2)C was synthesized by mechanically activated high-temperature reaction. X-ray diffraction was used for phase identification during the whole reaction process. Environment scanning electronic microscopy–field emission gun and energy dispersive x-ray were used to investigate the microstructure and the quantitative material composition of the specimen. (W0.8Al0.2)C was found to crystallize in the WC-type, and the cell parameters were a = 2.907(1) Å and c = 2.837(1) Å. The hardness of (W0.8Al0.2)C was tested to be 19.3 ± 1 GPa, and the density was 13.19 ± 0.05 g cm−3.

Tungusite: new data, relationship with gyrolite and structural model

1995 ◽  
Vol 59 (396) ◽  
pp. 535-543 ◽  
Author(s):  
Giovanni Ferraris ◽  
Alessandro Pavese ◽  
Svetlana V. Soboleva
Keyword(s):  
Solid Solution ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Structural Model ◽  
Substitutional Solid Solution ◽  
Chemical Analyses ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Tetrahedral Layer ◽  
The Ideal

AbstractNew chemical analyses, electron and X-ray powder diffraction data, and comparison with gyrolite and reyerite show that tungusite has the ideal formula , symmetry P and a = 9.714(9), b = 9.721(9), c = 22.09(3), α = 90.13(1)°, β = 98.3(2)°, γ = 120.0(1)°, Z = 1. A structural model for tungusite is derived by splitting the double tetrahedral layer of reyerite and inserting a trioctahedral X sheet which is ideally occupied by Fe2+. Polytypism phenomena due to different relative positions between tetrahedral and X sheets are discussed. A substitutional solid solution represented by the formula [Ca14(OH)8]Si24−yAlyO60[NaxM9−(x+z)□z(OH)14−(x+y+2z)·(x+y+2z)H2O] includes tungusite (x = y = z = 0, M = Fe2+ and gyrolite (x = 1, y = 1, z = 6, M = Ca).

scholarly journals Development of a Novel Low-Silver Cu-P Brazing Filler Metal Bearing Sn

Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 66
Author(s):  
Jie Wu ◽  
Songbai Xue ◽  
Qingcheng Luo
Keyword(s):  
Solid Solution ◽  
Lamellar Structure ◽  
Room Temperature ◽  
Filler Metal ◽  
Energy Dispersive Spectrometer ◽  
X Ray ◽  
Filler Metals ◽  
Cleavage Structure ◽  
Fracture Morphologies ◽  
Liquidus Temperatures

The flame brazing of H62 brass using a novel, low-silver Cu-P brazing filler metal was investigated in this study. The effect of the addition of a trace amount of Sn on the microstructure and properties of Cu-7P-1Ag filler metals was analyzed by means of X-ray diffractometer, scanning electron microscopy and energy dispersive spectrometer. The addition of trace Sn led to a decrease in the solidus and liquidus temperatures of Cu-7P-1Ag filler metals. Meanwhile, the spreading performance of the filler metals on a H62 brass substrate was improved. The microstructure of the low-silver, Cu-P brazing filler metal was mainly composed of α-Ag solid solution, α-Cu solid solution and Cu3P; an increase of Sn content led to the transformation of the microstructure of the joints from a block to a lamellar structure. When the Sn content was 0.5 wt. %, the shear strength of the joint at room temperature reached 348 MPa, and the fracture morphologies changed from a cleavage to a quasi-cleavage structure.

scholarly journals Minerály řady ullmannit - gersdorffit v asociaci s milleritem z haldy dolu Lill v Příbrami (Česká republika)

2020 ◽  
Vol 28 (1) ◽  
pp. 203-209
Author(s):  
Jiří Sejkora ◽  
Jakub Plášil ◽  
Jiří Špalek ◽  
Pavel Škácha
Keyword(s):  
Solid Solution ◽  
Czech Republic ◽  
Single Crystal ◽  
Unit Cell Parameter ◽  
Cell Parameter ◽  
Unit Cell ◽  
Ore Deposit ◽  
Metallic Luster ◽  
X Ray ◽  
Mine Dump

Minerals of the ullmannite–gersdorffite solid-solution was found at mine dump material from the Lill mine, the Černojamské ore deposit, Příbram, central Bohemia, Czech Republic. It forms grey groups of idiomorphic crystals up to 0.5 mm across with metallic luster on millerite crystals. It is strongly chemically zoned, from As-rich ullmannite to gersdorffite with variable Sb contents. Its unit-cell parameter, a 5.7728(13) Å and V 192.37(7) Å3, was refined from single-crystal X-ray data. Groups of acicular millerite crystals up to 4 mm in length and formula (Ni0.97Co0.03)Σ1.00S1.01 and very rare siegenite grains up to 80 μm and formula Co1.00(Ni1.66Co0.24Fe0.02)Σ1.92S4.09 were found in association.

scholarly journals Interaction of the components in the Gd-Mn-Sn ternary system at 873 and 673 K

2018 ◽  
Vol 19 (1) ◽  
pp. 60-65
Author(s):  
L. P. Romaka ◽  
Yu. V. Stadnyk ◽  
V. V. Romaka ◽  
M. Konyk ◽  
R. Serkiz
Keyword(s):  
Solid Solution ◽  
Ternary System ◽  
Substitutional Solid Solution ◽  
Structure Type ◽  
Binary Compound ◽  
Interstitial Solid Solution ◽  
Space Group ◽  
X Ray ◽  
Type Space ◽  
Ternary Compounds

The interaction of the components in the Gd-Mn-Sn ternary system was studied using the methods of X-ray and microstructure analyses, in the whole concentration range. The phase diagrams of the Gd-Mn-Sn system were constructed at 873 and 673 K. At both temperature of investigation the Gd-Mn-Sn system is characterized by existence of two ternary compounds: GdMn6Sn6 (MgFe6Ge6 structure type, space group P6/mmm) and Gd4Mn4Sn7 (Zr4Co4Ge7 structure type, space group I4/mmm). The formation of the interstitial solid solution GdMnхSn2 based on GdSn2 (ZrSi2-type) binary compound was found up to 10 at. % Mn at 873 K and 673 K. The existence of the substitutional solid solution based on GdMn2 (MgCu2-type) was observed up to 5 at.% Sn and 3 at. % Sn at 873 K and 673 K, respectively.

scholarly journals Structural Studies of the Epitaxial Layer of a Substitutional Solid Solution (GaAs)1−x(ZnSe)x with Nanocrystals

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
A. S. Saidov ◽  
Sh. N. Usmonov ◽  
D. V. Saparov
Keyword(s):  
Solid Solution ◽  
Epitaxial Layer ◽  
Surface Region ◽  
Substitutional Solid Solution ◽  
Epitaxial Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Ordered Array

In this work, we explored the possibility of growing a substitutional solid solution (GaAs)1−x(ZnSe)x with an ordered array of nanosize crystals on GaAs (100) substrates. Grown epitaxial films were investigated by the X-ray diffraction analysis method. The chemical composition of the grown epitaxial films was determined by a X-ray microanalyzer, along the thickness of the epitaxial layer. The photoluminescence spectrum was studied and a peak is observed at λmax = 465 nm, corresponding to the width of the band gap of zinc selenide EZnSe = 2.67 eV, which is apparently due to the nanocrystals ZnSe, disposed in the surface region of the epitaxial film of a solid solution (GaAs)1−x(ZnSe)x. Size of nanocrystals were evaluated by an atomic force microscopy.

Resistance-Temperature Characteristics of Cr Doped Ni0.7Mn2-xCu0.3CrxO4 NTC Thermistors

2020 ◽  
Vol 996 ◽  
pp. 9-14
Author(s):  
Le Jun Zhang ◽  
Ting Ting Li
Keyword(s):  
Solid Solution ◽  
Energy Dispersive Spectrometer ◽  
Solid State Reaction Method ◽  
B Value ◽  
Industrial Applications ◽  
Surface Element ◽  
X Ray Diffraction ◽  
Spinel Type ◽  
X Ray ◽  
Ntc Thermistors

Manganese-based solid solution ceramics of transition metal with spinel-type crystal structure have generated much interest as NTC thermistors in various domestic and industrial applications. Doping has been considered as one of the most important method to improve their electrical properties. In this work, Cr doped Mn-based solid solution NTC ceramics Ni0.7Mn2-xCu0.3CrxO4 (x = 0.1, 0.2, 0.3 and 0.4) were prepared by solid-state reaction method. X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray energy dispersive spectrometer (EDS) were applied to study the phase structure, surface morphology and surface element content. The results indicate that the resistance and B value increase as the substituted Cr content increases.

scholarly journals Electronic properties of phases in the quasi-binary Bi2Se3-Bi2S3 system.

2021 ◽  
Author(s):  
Zipporah Rini Benher ◽  
Sandra Gardonio ◽  
Mattia Fanetti ◽  
Paolo Moras ◽  
Asish Kumar Kundu ◽  
...  
Keyword(s):  
Solid Solution ◽  
Diffraction Analysis ◽  
Electronic Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compositional Range ◽  
System P ◽  
Wide Compositional Range

We explored the properties of the quasi-binary Bi2Se3-Bi2S3 system over a wide compositional range. X-ray diffraction analysis demonstrates that rhombohedral crystals can be synthesized within the solid solution interval 0-22...

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