II. Electrical conductivity and phase transition studies on pure and doped (Cd2+, Gd3+)KNaSO4 and K3Na(SO4)2

1983 ◽  
Vol 61 (3) ◽  
pp. 599-601 ◽  
Author(s):  
M. Sunitha Kumari ◽  
Etalo A. Secco
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
High Temperature ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Conductivity Measurements ◽  
Ion Conductor ◽  
Fast Ion Conductor ◽  
Fast Ion ◽  
Transition Studies

Electrical conductivity measurements on pure and doped KNaSO4 and K3Na(SO4)2 reveal high ionic conductivity values in the high temperature phase. High conductivity values ascribed to Na+ resemble a superionic or fast-ion conductor.

High temperature phase transition studies and dielectric properties of Sr2SbMnO6

2012 ◽  
Author(s):  
K. R. S. Preethi Meher ◽  
Pierre-Eymeric Janolin ◽  
Nicolas Guiblin ◽  
Gadige Paramesh ◽  
K. B. R. Varma
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Dielectric Properties ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Temperature Phase Transition ◽  
Transition Studies

Unusual Fast Cation Conduction in the High-Temperature Phase of Lithium Sodium Sulfate

2002 ◽  
Vol 756 ◽  
Author(s):  
H. Feldmann ◽  
R. E. Lechner ◽  
D. Wilmer
Keyword(s):  
High Temperature ◽  
Sodium Sulfate ◽  
Correlation Factor ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
60 Ghz ◽  
Tracer Transport ◽  
Ion Conductor ◽  
Fast Ion Conductor ◽  
A Charge

ABSTRACTLithium sodium sulfate (LiNaSO4) belongs to a group of simple inorganic salts exhibiting fast-cation conducting high-temperature phases with rotationally disordered anions. The analysis of a combination of quasielastic neutron scattering and high-frequency (10 MHz to 60 GHz) conductivity measurements in the high-temperature phase of LiNaSO4 reveals an unusual cation conduction mechanism: the Haven ratio, HR = D*/Dσ, turns out to be considerably larger than one. This behavior, to our knowledge detected for the first time in a typical fast ion conductor, can be traced back to a charge correlation factor clearly smaller than unity, indicating that charge transport is less effective than tracer transport in this material.

Synthesis, Structure, and Ionic Conductivity of K3NdSi6O15

1990 ◽  
Vol 210 ◽  
Author(s):  
Sossina M. Haile ◽  
Theo Siegrist ◽  
Robert A. Laudise ◽  
Bernhardt J. Wuensch
Keyword(s):  
Preexponential Factor ◽  
High Temperature Phase ◽  
Thermal Vibration ◽  
Temperature Phase ◽  
Hydrothermal Conditions ◽  
Ion Conductor ◽  
Composition And Structure ◽  
Fast Ion Conductor ◽  
Fast Ion ◽  
Reversible Phase

AbstractA structure earlier reported for K3NdSi6O15 suggests the possibility for fast—ion conduction by virtue of K+ ions which not only reside in connected channels, but which also display very large thermal vibration amplitudes. No properties of the phase had heretofore been examined. Crystals up to 2mm inlength have been synthesized under a variety of hydrothermal conditions. Refinement of the structure with single crystal x-ray data to a residual of 8.3% confirms the composition and structure of our crystals and reveals a very high thermal vibration amplitude along c for K+ ions which reside in interconnected [001] channels.A reversible phase transformation has been discovered at 180ºC with a heat of transformation of 4J/g. Preliminary measurements of the conductivity of the high temperature phase yield a preexponential factor of 3.4/cm and an activation energy of 0.61ev along [001], indicating that this compound is not a particularly good fast—ion conductor.

scholarly journals High-temperature phase transition of SrRuO3and SrHfO5: X-ray diffraction and PAC spectroscopy

1996 ◽  
Vol 52 (a1) ◽  
pp. C364-C364
Author(s):  
J. A. Guevara ◽  
S. L. Cuffini ◽  
Y. P. Mascarenhas ◽  
P. de la Presa ◽  
A. Ayala ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Pac Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Phase Transition

The thermodynamics of the divalent metal fluorides. I. Heat capacity of lead tetrafluorostannate, PbSnF4, from 10.3 to 352 K

1988 ◽  
Vol 66 (4) ◽  
pp. 549-552 ◽  
Author(s):  
Jane E. Callanan ◽  
Ron D. Weir ◽  
Edgar F. Westrum Jr.
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Thermodynamic Functions ◽  
Adiabatic Calorimetry ◽  
Temperature Limit ◽  
Divalent Metal ◽  
Ion Conductor ◽  
Metal Fluorides ◽  
Fast Ion Conductor ◽  
Fast Ion

We have measured the heat capacity of the fast ion conductor PbSnF4 at 10.3 < T < 352 K by adiabatic calorimetry. Our results show anomalous values in the Cp,m in the region 300 < T < 352 K. These are associated with the α–β crystallographic transition reported at 353 K. Because the upper temperature limit of our cryostat is around 354 K, it was impossible to follow the phase transition to completion. A more subtle anomaly in the Cp,m was detected between 130 and 160 K. Standard molar thermodynamic functions are presented at selected temperatures from 5 to 350 K.

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