scholarly journals Thermal Expansion Coefficient and Electrical Conductivity of Mn-Based Perovskite-Type Oxides

1993 ◽  
Vol 1993-4 (1) ◽  
pp. 213-219 ◽  
Author(s):  
Hiroshi Yamada
Keyword(s):  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Perovskite Type

Change of thermal expansion coefficient and electrical conductivity of LaCo1–xMxO3 (M = Fe, Ni)

1993 ◽  
Vol 8 (12) ◽  
pp. 3158-3162 ◽  
Author(s):  
H. Nagamoto ◽  
I. Mochida ◽  
K. Kagotani ◽  
H. Inoue ◽  
A. Negishi
Keyword(s):  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Bond Length ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Electrode Material ◽  
Formation Enthalpy ◽  
Crystal System ◽  
Ni Content ◽  
Fe Content

The thermal expansion coefficient of LaCo1−xFexO3 averaging between 25 and 1000 °C decreased linearly with the Fe content, x. The thermal expansion of LaCo1−xNixO3 decreased with increasing the Ni content, but those for x = 0.67 and 1.0 were almost identical at 1000 °C due to the transition of the crystal system of LaNiO3. The behavior of thermal expansion was interpreted in terms of the formation enthalpy of the perovskites and the bond length between a B-site cation and an oxide anion. LaCo0.67Ni0.33O3, which has the electrical conductivity of 4 × 102 S/cm, could be a good candidate for the air electrode material.

Analysis of Electric Conductive Activation Energy from the Electric Conductivity of Silicate and Borate Glasses

2008 ◽  
Vol 368-372 ◽  
pp. 1451-1453
Author(s):  
Young Joon Jung ◽  
Young Seok Kim ◽  
Kyu Ho Lee ◽  
Tae Ho Kim ◽  
Bong Ki Ryu
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Electric Conductivity ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Arrhenius Equation ◽  
Activation Energies ◽  
Borate Glasses ◽  
Sio2 System

This work is to compare the electric conductive activation energies with increasing Na2O in SiO2 and B2O3 glasses. The electrical conductivity is measured by TER2000 analyzer and it is compared with value calculated by Arrhenius equation. The conductivity of SiO2 system glasses is higher than B2O3 system glasses, and the highest value is 1.36 × 10-4 cm-1 in 60SiO2-40Na2O glass. The activation energy from conductivity is proportion to temperature and inverse proportion to Na2O contents. The activation energy is analyzed from density and CTE (thermal expansion coefficient).

Synthesis and Characterization of Gd(1−x)SrxCo(1−y)FeyO(3−Δ) as a Cathode Material for Intermediate Temperature Solid Oxide Fuel Cells

2003 ◽  
Vol 801 ◽  
Author(s):  
C. R. Dyck ◽  
G. Yu ◽  
V. D. Krstic
Keyword(s):  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Cathode Material ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
High Catalytic Activity ◽  
Material System ◽  
Composite Cathodes ◽  
High Thermal Expansion

ABSTRACTGd(1−x)SrxCoO(3−Δ) (GSC) is a promising cathode material system for use in IT-SOFCs due to its high catalytic activity for oxygen reduction and appreciable conductivity. However, it has a high thermal expansion coefficient that is unmatched to the common IT-SOFC electrolyte material, Ce0.8Gd0.2O(2−Δ) (CGO). Gd0.8Sr0.2CoO(3−Δ) (GS20C) was determined to provide the best balance of properties as a base composition in the GSC system for further study. GS20C exhibited electrical conductivity of 400 S cm−1 at 600°C and a linear thermal expansion coefficient of 23 ppm/°C. Manipulation of the Co-site in GS20C by Fe substitution to form Gd(0.8)Sr(0.2)Co(1−y)FeyO(3−Δ) (GS20CFY, Y= 0, 20, 40, 60, 80, 100 atomic%) resulted in a dramatic decrease in the thermal expansion coefficient to a level close to that of the electrolyte (∼13 ppm/°C). However, the decrease in thermal expansion was accompanied by a large decrease in the conductivity as the iron content was increased in the system (to ∼10 S cm−1). Alternatively, formation of GS20C/CGO composite cathodes resulted in thermal matching with the electrolyte material up to the IT-SOFC operating temperature of approximately 600°C with the maintenance of high electrical conductivity. Composite GS20C/CGO cathodes may reduce the problems associated with poor GSC thermal matching to the electrolyte without compromising other important cathodic properties.

scholarly journals Out-of-Plane Thermal Expansion Coefficient and Biaxial Young’s Modulus of Sputtered ITO Thin Films

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 153
Author(s):  
Chuen-Lin Tien ◽  
Tsai-Wei Lin
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Thermal Stress ◽  
Young’S Modulus ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Young's Modulus ◽  
Heating Temperature ◽  
Glass Substrates ◽  
Ito Thin Films

This paper proposes a measuring apparatus and method for simultaneous determination of the thermal expansion coefficient and biaxial Young’s modulus of indium tin oxide (ITO) thin films. ITO thin films simultaneously coated on N-BK7 and S-TIM35 glass substrates were prepared by direct current (DC) magnetron sputtering deposition. The thermo-mechanical parameters of ITO thin films were investigated experimentally. Thermal stress in sputtered ITO films was evaluated by an improved Twyman–Green interferometer associated with wavelet transform at different temperatures. When the heating temperature increased from 30 °C to 100 °C, the tensile thermal stress of ITO thin films increased. The increase in substrate temperature led to the decrease of total residual stress deposited on two glass substrates. A linear relationship between the thermal stress and substrate heating temperature was found. The thermal expansion coefficient and biaxial Young’s modulus of the films were measured by the double substrate method. The results show that the out of plane thermal expansion coefficient and biaxial Young’s modulus of the ITO film were 5.81 × 10−6 °C−1 and 475 GPa.

Sign in / Sign up

Export Citation Format

Share Document