Effect of Chromium Doping on the Crystal Structure, Electrical Conductivity and Thermal Expansion of Manganese Cobalt Spinel Oxides

2011 ◽  
pp. 125-129
Author(s):  
Yingjia Liu ◽  
Kangli Wang ◽  
Jeffrey W Fergus
Keyword(s):  
Crystal Structure ◽  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Chromium Doping ◽  
Cobalt Spinel ◽  
Spinel Oxides

CRYSTAL STRUCTURE, ELECTRICAL CONDUCTIVITY AND THERMAL EXPANSION OF Pr1-xSrxFeO3-δ(0 ≤ x ≤ 0.6)

2012 ◽  
Vol 26 (32) ◽  
pp. 1250174 ◽  
Author(s):  
V. PRASHANTH KUMAR ◽  
Y. S. REDDY ◽  
P. KISTAIAH ◽  
C. VISHNUVARDHAN REDDY
Keyword(s):  
Crystal Structure ◽  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Room Temperature ◽  
Small Polaron ◽  
Linear Thermal Expansion ◽  
Lattice Parameter ◽  
Polaron Hopping ◽  
X Ray ◽  
Perovskite Type

The crystal structure at room temperature (RT), thermal expansion from RT to 1000°C and electrical conductivity, from RT to 600°C, of the perovskite-type oxides in the system Pr 1-x Sr x FeO 3(x = 0, 0.2, 0.4, 0.6) were studied. All the compounds have the orthorhombic perovskite GdFeO 3-type structure with space group Pbnm. The lattice parameters were determined by X-ray powder diffraction. The Pseudo cubic lattice parameter decreases with an increase in x, while the coefficient of linear thermal expansion increases. The thermal expansion is almost linear for x = 0 and 0.2. The electrical conductivity increases with increasing x while the activation energy decreases. The electrical conductivity can be described by the small polaron hopping conductivity model.

scholarly journals Crystal structure, thermal expansion and electrical conductivity of LaCoxNiyMozO3

2016 ◽  
Vol 45 (39) ◽  
pp. 15290-15293
Author(s):  
V. Øygarden ◽  
T. Grande
Keyword(s):  
Crystal Structure ◽  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Electrical Properties ◽  
System P

The effect of Mo-substitution on the crystal structure, thermal expansion and electrical properties is investigated for the LaCoxNiyMozO3 system.

Crystal structure, microstructure, thermal expansion and electrical conductivity of CeO2–ZrO2 solid solution

2017 ◽  
Vol 116 (8) ◽  
pp. 477-481 ◽  
Author(s):  
Xiangnan Wang ◽  
Tao Liu ◽  
Cheng Wang ◽  
Jingkun Yu ◽  
Lin Li
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Electrical Conductivity ◽  
Thermal Expansion

scholarly journals Crystal structure, thermal and electrotransport properties of NdBa1–xSrxFeCo0.5Cu0.5O5+δ (0.02 ≤ x ≤ 0.20) solid solutions

2021 ◽  
Vol 8 (3) ◽  
pp. 20218301
Author(s):  
A. I. Klyndyuk ◽  
Ya. Yu. Zhuravleva ◽  
N. N. Gundilovich
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Solid Solutions ◽  
Electrical Transport ◽  
Linear Thermal Expansion ◽  
Solid State Reactions ◽  
Partial Substitution ◽  
Cell Parameters

Using solid-state reactions method, the solid solutions of layered oxygen-deficient perovskites NdBa1–xSrxFeCo0.5Cu0.5O5+δ (0.02 ≤ x ≤ 0.20) were prepared; their crystal structure, thermal stability, thermal expansion, electrical conductivity and thermopower were studied. It was found that NdBa1–xSrxFeCo0.5Cu0.5O5+δ phases crystallize in tetragonal syngony (space group P4/mmm) and are p-type semiconductors, whose conductivity character at high temperatures changed to the metallic one due to evolution from the samples of so-called weakly-bonded oxygen. Partial substitution of barium by strontium in NdBaFeCo0.5Cu0.5O5+δ leads to the small decreasing of unit cell parameters, thermal stability and thermopower of NdBa1–xSrxFeCo0.5Cu0.5O5+δ solid solutions, increasing of their electrical conductivity values and slightly affects their linear thermal expansion coefficient and activation energy of electrical transport values.

Thermal Expansion, Oxygen Non-Stoichiometry and Diffusion Mobility in some Ferrites-Nickelites

2013 ◽  
Vol 200 ◽  
pp. 86-92 ◽  
Author(s):  
Vladimir Vashook ◽  
Jean Rebello ◽  
J.Y. Chen ◽  
Leonid Vasylechko ◽  
Dmytro Trots ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Oxygen Diffusion ◽  
Oxygen Exchange ◽  
Diffusion Mobility ◽  
Diffusion Characteristics ◽  
And Diffusion

Crystal structure,thermal expansion, oxygen non-stoichiometry, electrical conductivity and diffusion characteristics of two analogous LaFe0.7Ni0.3O3‑d and PrFe0.7Ni0.3O3‑d compositions were investigated depending on temperature (201000 °C) and oxygen partial pressure (0.6–21000 Pa). The found oxygen diffusion and oxygen exchange coefficients for the both compositions at similar conditions are near to each other and varied in the range of 110‑7110‑5 cm2s‑1 and 510‑6110‑4 cms‑1, respectively.

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