scholarly journals Особенности структур распада твердого раствора Cu-Ag cульфидов на месторождении Теплое (Северо-Восток России)

2021 ◽  
pp. 31-40
Author(s):  
I. A. Bryzgalov ◽  
◽  
N. E. Savva ◽  
O. V. Kononov ◽  
A. V. Volkov ◽  
...  
Keyword(s):  
Solid Solution ◽  
Low Temperature ◽  
Hydrothermal Solution ◽  
Structural Rearrangement ◽  
Silver Sulfide ◽  
Impurity Element ◽  
Solid Solution Decomposition ◽  
Structural Impurity ◽  
Mineral Constituents ◽  
Epithermal Au

The authors consider features of the triple structure of Ag-Cu-S solid solution decomposition resulted from redistribution of matter in the ores of the epithermal Au-Ag Teploye deposit due to the spatial combination of volcanogenic Au-Ag mineralization, with relatively later copper porphyry. The discovery of the mckinstryite, copper-silver sulfide, permits to consider the occurrence of copper in acanthite a non-structural impurity element, while the term "cupreous acanthite" appears insufficiently substantiated. It has been suggested that the mckinstryite-jalpaite (+ acanthite) structure was formed not by the decomposition of a solid solution or the crystallization of a normal hydrothermal solution, but but in the course of solidification of the sluggish, viscous, colloid-like substance in a metastable environment under low-temperature conditions, and was accompanied by structural rearrangement of its mineral constituents.

Low Temperature Kinetics of In-Cd Solid Solution Decomposition

2008 ◽  
Vol 137 ◽  
pp. 35-42
Author(s):  
P.P. Pal-Val ◽  
L.N. Pal-Val ◽  
A.A. Ostapovets ◽  
P. Vanek
Keyword(s):  
Solid Solution ◽  
Low Temperature ◽  
Driving Force ◽  
Transition Rate ◽  
Activation Parameters ◽  
Temperature Structure ◽  
Structure Transformation ◽  
Solid Solution Decomposition ◽  
Low Temperature Kinetics ◽  
Kinetics Of

An influence of Cd content on the kinetics of a spontaneous low-temperature structure transformation in In-rich In - Cd alloys has been investigated using acoustic, resistivity and DSCtechniques. It is established that increase of the concentration of Cd leads to an essential increase of a driving force of the transition that results in an increase of the transition rate and in decrease of the relaxation time. The low-temperature instability of acoustic, resistivity and thermal properties is caused presumably by a decomposition of the solid solution that has features of a phase transition of the 1st order. The main empirical activation parameters of the transformation are derived. The activation energy amounts to U0 = 0.43 eV, the attempt period is τ 0 =5 × 10-9 s. The probable border of the decomposition in the phase diagram of the In-Cd system is established.

Low temperature SR-XRPD study of åkermanite-gehlenite solid solution

2006 ◽  
Vol 2006 (suppl_23_2006) ◽  
pp. 419-424 ◽  
Author(s):  
M. Merlini ◽  
M. Gemmi ◽  
G. Artioli
Keyword(s):  
Solid Solution ◽  
Low Temperature

Solid solution decomposition mechanisms in cast and microcrystalline Al-Sc alloys: I. Experimental studies

2012 ◽  
Vol 2012 (5) ◽  
pp. 415-427 ◽  
Author(s):  
V. N. Chuvil’deev ◽  
A. V. Nokhrin ◽  
I. M. Makarov ◽  
Yu. G. Lopatin ◽  
N. V. Sakharov ◽  
...  
Keyword(s):  
Solid Solution ◽  
Experimental Studies ◽  
Solid Solution Decomposition ◽  
Decomposition Mechanisms

scholarly journals Low-temperature Synthesis of Nanometer-sized Single Crystals in MgO-ZnO Solid Solution

2002 ◽  
Vol 75 (7) ◽  
pp. 327-329 ◽  
Author(s):  
Seisaku OHSHIRO ◽  
Mitsunobu IWASAKI ◽  
Masayoshi HARA ◽  
Seishiro ITO
Keyword(s):  
Solid Solution ◽  
Low Temperature ◽  
Single Crystals ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis

scholarly journals Formation of Intermediate Phases and Supersaturated Solid Solution in Al-Cu System during Diffusion

2018 ◽  
Vol 383 ◽  
pp. 31-35 ◽  
Author(s):  
Alexey Rodin ◽  
Nataliya Goreslavets
Keyword(s):  
Phase Diagram ◽  
Solid Solution ◽  
High Temperature ◽  
Chemical Composition ◽  
Low Temperature ◽  
Supersaturated Solid Solution ◽  
Diffusion Processes ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Intermediate Phases

The study of diffusion processes in the aluminum - copper system was carried out at the temperature 350 and 520 °C. Special attention was paid on the chemical composition of the system near Al/Cu interface. It was determined that the intermediate phases in the system, corresponding to the equilibrium phase diagram, were not formed at low temperature. At high temperature the intermediate phases forms starting with Cu - rich phases. In both cases supersaturated solid solution of copper in aluminum could be observed near the interface.

scholarly journals Low-temperature hydrothermal synthesis of hierarchical flower-like CuB2O4 superstructures

2020 ◽  
Vol 14 (2) ◽  
pp. 113-118
Author(s):  
Daniel Ursu ◽  
Anamaria Dabici ◽  
Marinela Miclau ◽  
Nicolae Miclau
Keyword(s):  
Thermal Stability ◽  
Low Temperature ◽  
Self Assembly ◽  
Hydrothermal Solution ◽  
Optical Measurements ◽  
Oriented Attachment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
One Step

We report for the first time the fabrication of hierarchical ordered superstructure CuB2O4 with flower-like morphology via a one-step, low temperature hydrothermal method. The tetragonal structure of CuB2O4 was determined by X-ray diffraction and high-resolution transmission electron microscopy. Optical measurements attested of the quality of the fabricated CuB2O4 and high temperature X-ray diffraction confirmed its thermal stability up to 600 ?C. The oriented attachment growth and the hierarchical self-assembly of micrometer-sized platelets producing hierarchical superstructures with flower-like morphology are designed by pH of the hydrothermal solution. The excellent band gap, high thermal stability and hierarchical structure of the CuB2O4 are promising for the photovoltaic and photocatalytic applications.

Sign in / Sign up

Export Citation Format

Share Document