The Agglomeration of Point Defects in Transition Metal Monoxides

1986 ◽  
Vol 82 ◽  
Author(s):  
E. Gartstein ◽  
M. Radler ◽  
T. O. Mason ◽  
J. B. Cohen
Keyword(s):  
Electrical Properties ◽  
Transition Metal ◽  
Single Crystals ◽  
High Temperatures ◽  
Point Defects ◽  
Absorption Edge ◽  
Defect Structure ◽  
Diffuse Scattering ◽  
Theoretical Work ◽  
Cluster Calculations

ABSTRACTRecent results on the diffuse scattering from single crystals of Fe1−xO at high temperatures reveal that the defect structure is in striking agreement with embedded cluster calculations by Ellis et al. The dominant defect is an imperfect 7:2 cluster. Mixtures of this and a larger complex (13:4) can explain the electrical properties. XANES studies of this oxide are in agreement with Ellis' theoretical work. However, in both FOx and MnxO it is not possible to use the shift of the cation K absorption edge to characterize valence. In fact in the latter case the shift passes through a minimum, perhaps indicating the onset of clustering.

Structural stabilities and electrical properties of Ba 8 Ga 16− x Cu x Sn 30 single crystals under high temperatures

2016 ◽  
Vol 25 (6) ◽  
pp. 067402
Author(s):  
Jin-Song Wang ◽  
Feng Cheng ◽  
Hong-Xia Liu ◽  
De-Cong Li ◽  
Lan-Xian Shen ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Single Crystals ◽  
High Temperatures

Role of point defects in the thermal decomposition of ammonium perchlorate

1968 ◽  
Vol 307 (1490) ◽  
pp. 303-315 ◽  
Keyword(s):  
Electrical Conductivity ◽  
Thermal Decomposition ◽  
Single Crystals ◽  
Ammonium Perchlorate ◽  
Point Defects ◽  
Defect Structure ◽  
Electrical Conductance ◽  
Charge Carriers ◽  
Point Defect Structure

The thermal decomposition of ammonium perchlorate has usually been described in terms of chemical reactions with the point defect structure of the solid ignored. Both the isothermal and adiabatic decompositions have been reinvestigated over the temperature range 200 to 450°C. There is a good correlation between the isothermal d. c. electrical conductance of single crystals, and of conductance as a function of temperature with the extent of decomposition, indicating that charge carriers play a significant role in the thermal decomposition. The study of the electrical conductivity as a function of temperature has resulted in the assignment of a probable defect structure to ammonium perchlorate: cationic Frenkel type below 250°C and Schottky disorder at higher temperatures. This suggests an explanation for the phenomenon of only 30% decomposition below 250°C and 100% above this temperature.

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