scholarly journals Electronic Conductivity of ZrO2-CeO2-YO1.5 Solid Solutions

2001 ◽  
Vol 2001-16 (1) ◽  
pp. 422-430
Author(s):  
Yueping Xiong
Keyword(s):  
Solid Solutions ◽  
Electronic Conductivity

Hydrothermal Synthesis and Properties of Ce1−xMxO2-δ(M = La, Bi, Sm, Pr, Tb) Solid Solutions

1998 ◽  
Vol 548 ◽  
Author(s):  
M. Greenblatt ◽  
P. Shuk ◽  
W. Huang ◽  
S. Dikmen ◽  
M. Croft
Keyword(s):  
Solid Solutions ◽  
Ultrafine Particles ◽  
Electronic Conductivity ◽  
Solubility Limit ◽  
Hydrothermal Conditions ◽  
Oxide Systems ◽  
Oxide Ion Conductivity ◽  
Maximum Conductivity ◽  
Crystallite Dimension ◽  
20 Nm

ABSTRACTA systematic study of hydrothermally prepared Ce1−x,MxO2−δ, (M= Sm, Bi, Pr, Tb; x= 0-0.30) solid solutions, promising materials for application in solid oxide fuel cells and oxygen membranes is presented. Ultrafine particles of uniform crystallite dimension, ∼ 20 nm can be formed in 30 min. under hydrothermal conditions (260°C, 10 MPa). The small particle size (20-50 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramics at 900-1350°C, significantly lower temperatures than 1600-1650°C required for samples prepared by solid state techniques. The solubility limit of Bi2O3, in CeO2, was determined to be around 20 mol. %. The maximum conductivity, σ600°C ∼ 4.4 × 10−3 S/cm with Ea = 1.01 eV, and σ600°C = 5.7 × 10−3 S/cm with Ea ≈ 0.9 eV was found at x= 0.20 and x= 0.17 for Bi and Sm, respectively. In the Ce-Pr/Tb oxide systems, in addition to the high oxide ion conductivity, electronic conductivity occurs through the hopping of small polarons by a thermally activated mechanism (electron hopping from the Pr3+/Tb3+ to a neighboring Pr4+/Tb4+ ion).

scholarly journals Influence of cation substitution on electrical conductivity of microcrystalline ceramics based on (Cu1-xAgx)7GeSe5I solid solutions

2021 ◽  
Vol 24 (02) ◽  
pp. 131-138
Author(s):  
I.P. Studenyak ◽  
◽  
A.I. Pogodin ◽  
V.I. Studenyak ◽  
T.O. Malakhovska ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Solid Solutions ◽  
Electronic Conductivity ◽  
Microstructural Analysis ◽  
Cation Substitution ◽  
Cationic Sublattice ◽  
Total Electrical Conductivity ◽  
Complex Process ◽  
Nonlinear Character ◽  
Average Size

Ceramic samples based on the microcrystalline powders (Cu1–хAgx)7GeSe5I (x = 0, 0.25, 0.5, 0.75, 1) were prepared by pressing them at the pressure close to 400 MPa and subsequent annealing at 873 K for 36 hours. Using the microstructural analysis, the average size of microcrystallites of these samples was determined. Investigation of electrical conductivity of ceramics based on (Cu1 хAgx)7GeSe5I solid solutions was carried out using the method of impedance spectroscopy in the frequency range from 10 Hz to 3×105 Hz and within the temperature range 293...383 K. Analysis of the Nyquist plots allowed determining the contributions of ionic and electronic components to the total electrical conductivity. The temperature dependence of ionic and electronic conductivity in Arrhenius coordinates is linear, which indicates their thermoactivation character. The compositional behaviour of ionic and electronic conductivity, as well as their activation energies have been studied. Their nonlinear character can be explained by the complex process of recrystallization and Cu+ ↔ Ag+ cation substitution within the cationic sublattice.

PHASE TRANSITIONS IN SOLID SOLUTIONS BASED ON CDAS2 AT PRESSURES UP TO 50 GPA

2021 ◽  
Vol 0 (1) ◽  
pp. 102-105
Author(s):  
A.V. TEBENKOV ◽  
◽  
G.V. SUKHANOVA ◽  
A.N. BABUSHKIN ◽  
◽  
...  
Keyword(s):  
Phase Transitions ◽  
Crystal Lattice ◽  
Solid Solutions ◽  
Electrical Resistance ◽  
Structural Changes ◽  
Electronic Conductivity ◽  
Charge Carriers ◽  
Lattice Stability ◽  
Diamond Anvils ◽  
The Impact

Research has been performed into baric dependences between electrical resistance and thermo-EMF of eutectic solid solutions based on cadmium diarsenide of various compositions (Cd0.97Zn0.03As2 and Cd0.95Zn0.05As2) at pressures from 16 to 50 GPa and room temperature. Pressures were created in a chamber with conducting diamond anvils that served as contacts with the sample. Structural changes were recorded by changing electrical resistance and thermo-EMF. When replacing cadmium atom, zinc forms closer bonds with arsenic, which must result in the crystal lattice strengthening and higher pressures of phase transitions. Solid solutions preserve phase transitions observed in pure cadmium diarsenide. An increase in the crystal lattice stability of the solutions is confirmed compared to initial cadmium diarsenide. It is shown that with an increase in the zinc concentration pressures of phase transitions are shifted into the zone of higher pressures. The compounds preserve electronic conductivity in the range of pressures under consideration. At pressures higher than 30 GPa the thermo-EMF values become close to zero. This may be due to both an increase on concentrations of minority charge carriers and the impact of additional donating levels in the forbidden zone of solid solutions.

Electronic Conductivity of In2 O 3 Solid Solutions with ZrO2

1994 ◽  
Vol 141 (10) ◽  
pp. 2759-2768 ◽  
Author(s):  
K. Sasaki ◽  
H. P. Seifert ◽  
L. J. Gauckler
Keyword(s):  
Solid Solutions ◽  
Electronic Conductivity

Electronic Conductivity of ZrO[sub 2]–CeO[sub 2]–YO[sub 1.5] Solid Solutions in a Wide Range of Temperature and Oxygen Partial Pressure

2006 ◽  
Vol 153 (12) ◽  
pp. A2198 ◽  
Author(s):  
Yueping Xiong ◽  
Katsuhiko Yamaji ◽  
Natsuko Sakai ◽  
Haruo Kishimoto ◽  
Teruhisa Horita ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Solid Solutions ◽  
Electronic Conductivity ◽  
Wide Range

Electronic Conductivity of ZrO[sub 2]-CeO[sub 2]-YO[sub 1.5] Solid Solutions

2001 ◽  
Vol 148 (12) ◽  
pp. E489 ◽  
Author(s):  
Yueping Xiong ◽  
Katsuhiko Yamaji ◽  
Natsuko Sakai ◽  
Hideyuki Negishi ◽  
Teruhisa Horita ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Electronic Conductivity

ChemInform Abstract: Electronic Conductivity of In2O3 Solid Solutions with ZrO2.

ChemInform ◽  
2010 ◽  
Vol 26 (4) ◽  
pp. no-no
Author(s):  
K. SASAKI ◽  
H. P. SEIFERT ◽  
L. J. GAUCKLER
Keyword(s):  
Solid Solutions ◽  
Electronic Conductivity

Electronic conductivity of Sr3-3xLa2x█x(VO4)2 solid solutions

2000 ◽  
Vol 36 (1) ◽  
pp. 72-75 ◽  
Author(s):  
I. A. Leonidov ◽  
O. N. Leonidova ◽  
V. K. Slepukhin
Keyword(s):  
Solid Solutions ◽  
Electronic Conductivity

Electrochemical Properties of Ag5Te2Cl0.8Br0.2, a Representative of the Solid Solutions Ag5Te2Cl1–xBrx

2008 ◽  
Vol 63 (9) ◽  
pp. 1083-1086 ◽  
Author(s):  
Melanie Bawohl ◽  
Tom Nilges
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Space ◽  
Ionic Conductivity ◽  
Phase Transition Temperature ◽  
Solid Solutions ◽  
Electronic Conductivity ◽  
Space Group ◽  
Disorder Phase Transition ◽  
Wide Range

Impedance spectroscopic investigations of Ag5Te2Cl0.8Br0.2, a selected representative of the solid solutions Ag5Te2Cl1−xBrx with x = 0 - 1, proved the mixed-conducting property of this class of materials. Two polymorphs are realized in the temperature range of 309 to 410 K, the monoclinic β - phase (space group P21/n) and the tetragonal α-phase (space group I4/mcm) with an order-disorder phase transition temperature of 336 K (DSC). A sharp increase of the total and ionic conductivity can be observed at 337 K, in good accordance with the phase transition temperature. The electronic conductivity exceeds the ionic conductivity by approximately one order of magnitude over a wide range of temperature. Conductivities are σion = 6.9×10−5 (309 K) and σtot = 4.80×10−4 Ω−1 cm−1 (310 K) for β -Ag5Te2Cl0.8Br0.2 and σion = 1.6×10−2 (395 K) and σtot = 1.73×10−1 Ω−1 cm−1 (394 K) for α-Ag5Te2Cl0.8Br0.2.

Synthesis and Characterization of the LiMnP1–xVxO4–δ Solid Solutions

2010 ◽  
Vol 65 ◽  
pp. 269-274 ◽  
Author(s):  
Dina G. Kellerman ◽  
Natalya Mukhina ◽  
Vadim Gorshkov ◽  
Boris Tsarev ◽  
Nikolai Zhuravlev ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Lithium Iron Phosphate ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Local Environment ◽  
Oxygen Nonstoichiometry ◽  
Partial Replacement ◽  
Anion Sublattice ◽  
Power Sources ◽  
Synthesis Conditions

Compounds with the olivine-type structures are considered as perspective materials for lithium-ion power sources for both industrial and transport applications. Lithium iron phosphate is most highly developed from this family, but LiMnPO4 is supposed as much promising, due to its higher EMF vs. lithium. One of the main lacks of this class of materials is the low electronic conductivity. The traditional ways of conductivity increase by partial replacement of Mn with other transition metal for LiMnPO4 do not result to essential success. Our approach consisting in the influence onto anion sublattice results to better effect. Such solid solutions should be suitable for oxygen nonstoichiometry creation in virtue of ability of vanadium ion for oxidation degree downturn. Using magnetic methods, we succeeded to show that the required solid solutions are really formed. The optimal synthesis conditions of LiMnP1-xVxO4-δ solid solutions were determined. It was shown, that the doping of LiMnPO4 by vanadium jointly with oxygen nonstoichiometry brings to substantial enhance of electronic conductivity in this material. Observed peculiarities of the magnetic properties indicate the restructuring in the local environment in anion sublattice.

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