Textural and phase stability of CexZr1−xO2 mixed oxides under high temperature oxidising conditions

1999 ◽  
Vol 50 (2) ◽  
pp. 271-284 ◽  
Author(s):  
G Colón ◽  
F Valdivieso ◽  
M Pijolat ◽  
R.T Baker ◽  
J.J Calvino ◽  
...  
Keyword(s):  
High Temperature ◽  
Phase Stability ◽  
Mixed Oxides

scholarly journals Effect of cobalt (nickel) oxide on the properties of zinc–titanium sorbents for high temperature desulphurization of model coal gas

2021 ◽  
Author(s):  
M. Chomiak ◽  
J. Trawczyński ◽  
M. Zawadzki
Keyword(s):  
High Temperature ◽  
Sorption Capacity ◽  
Catalytic Effect ◽  
Mixed Oxides ◽  
Mixed Metal Oxides ◽  
Coal Gas ◽  
Cobalt Nickel ◽  
Texture Structure ◽  
Cobalt Nickel Oxide ◽  
Co Doped

AbstractZn–Ti–Co(Ni) sorbents for H2S removal from model hot coal were prepared and characterized. Effects of cobalt (Co) and nickel (Ni) on the sorbents texture, structure, H2S sorption capacity and regeneration properties were determined. TiO2 formed mixed metal oxides with CoO and NiO in the fresh sorbents, while TiO2 and nanocrystalline sulfides of Zn, Co, Ni were found in sulphided ones. The oxidative regeneration of sulphided sorbents re-formed mixed oxides. Sorption capacity of studied materials increased along with an increase of the amount of added Co (Ni) and also with the number of work cycles. Co-doped Zn–Ti materials adsorbed up to 244% more sulfur than these of Zn–Ti, while Ni-doped materials adsorbed ca. twice more H2S than the corresponding Co-doped sorbents. The addition of Co (Ni) decreased the temperature of ZnS oxidation. The catalytic effect of the Co (Ni) oxides on the oxidation of ZnS was suggested.

Crystal structure, chemical expansion and phase stability of HoMnO3 at high temperature

2012 ◽  
Vol 196 ◽  
pp. 528-535 ◽  
Author(s):  
Sverre M. Selbach ◽  
Amund Nordli Løvik ◽  
Kristin Bergum ◽  
Julian R. Tolchard ◽  
Mari-Ann Einarsrud ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Phase Stability ◽  
Chemical Expansion

Catalysis by shapely nanocrystals of the Ce1−xYbxO2−x/2 mixed oxides — Synthesis and phase stability

2019 ◽  
Vol 155 ◽  
pp. 109796 ◽  
Author(s):  
Małgorzata A. Małecka ◽  
Piotr Kraszkiewicz ◽  
Oleksii Bezkrovnyi
Keyword(s):  
Phase Stability ◽  
Mixed Oxides

Phase Stability and High Temperature Tensile Properties of W doped gamma-TiAl

2000 ◽  
Vol 646 ◽  
Author(s):  
Keizo Hashimoto ◽  
Hirohiko Hirata ◽  
Youji Mizuhara
Keyword(s):  
High Temperature ◽  
Phase Stability ◽  
Ternary Phase ◽  
Elevated Temperatures ◽  
Ternary Phase Diagram ◽  
Arc Melting ◽  
Structural Applications ◽  
High Temperature Tensile ◽  
Promising Alloys ◽  
High Temperature Tensile Properties

ABSTRACTTungsten (W) doped γ-TiAl is one of promising alloys among many other proposed TiAl base alloys, for the purpose of structural applications at elevated temperatures. Ingots of W doped γ-TiAl were produced by plasma arc melting, followed by homogenizing heat treatment and isothermal forging to control their microstructures. The phase stability of W doped γ-TiAl has been studied quantitatively, using the specimens quenched from 1273 K. Equilibrium compositions of consisting phases were analyzed by means of EDS analysis in a TEM. An isothermal cross section of the Ti-Al-W ternary phase diagram at 1273K has been proposed based on the experimental observations. Small amounts of W addition (< 1at%) to Ti-48at%Al cause a phase shift from α2+γ to α2+β+γ, which suggests that W is the strongest β stabilizer among transition metals, such as Cr and Mo. Mechanical property measurements of W doped γ-TiAl show that the high temperature tensile strength has been improved by the W addition. Relationships between the microstructures and the mechanical properties of W doped γ-TiAl have been discussed.

scholarly journals High temperature phase stability in Li0.12Na0.88NbO3: A combined powder X-ray and neutron diffraction study

2015 ◽  
Vol 118 (9) ◽  
pp. 094101 ◽  
Author(s):  
S. K. Mishra ◽  
P. S. R. Krishna ◽  
A. B. Shinde ◽  
V. B. Jayakrishnan ◽  
R. Mittal ◽  
...  
Keyword(s):  
High Temperature ◽  
Neutron Diffraction ◽  
Diffraction Study ◽  
Phase Stability ◽  
Neutron Diffraction Study ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
X Ray
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