Cationic conductivity, water species motions and phase transitions in H3OUO2PO4·3H2O(HUP) and mup related compounds (M+= Na+, K+, Ag+, Li+, NH+4)

1985 ◽  
Vol 17 (4) ◽  
pp. 295-306 ◽  
Author(s):  
M PHAMTHI ◽  
P COLOMBAN
Keyword(s):  
Phase Transitions ◽  
Conductivity Water ◽  
Related Compounds ◽  
Water Species

Dielectric Loss in Vanadyl Pnictates

1990 ◽  
Vol 210 ◽  
Author(s):  
Joseph F. Lomax ◽  
John J. Fontanella ◽  
Mary C. Wintersgill ◽  
Anthony Kotarski
Keyword(s):  
Dielectric Loss ◽  
Complex Impedance ◽  
Audio Frequency ◽  
Vanadyl Phosphate ◽  
Nonstoichiometric Compound ◽  
Proton Movement ◽  
Related Compounds ◽  
Water Species ◽  
Acid Nature ◽  
Chemical Evidence

AbstractThe results of audio frequency complex impedance studies for vanadyl phosphate and its hydrates (VOPO4*nH2O;n=0,1,2) are reported. Measurements were made at seventeen frequencies between 10 and 105 Hz over the temperature range 5.5-380K. Two lowtemperature features were observed and are correlated with particular water species between the VOPO4 layers. In light of chemical evidence and compleximpedance measurements on related compounds, it is speculated that VOPCO4*nH2O (Pc = P, As) can be thought of as a mixed nonstoichiometric compound [VO(HPcO4)]x[VOPcO4O4]1-x*nH2O and the solid Brϕnsted acid nature of the compound is related to proton movement between layer pnictates and intralayer waters.

Magnetic structures and their phase transitions in lanthanide cuprates and related compounds

1990 ◽  
Vol 90-91 ◽  
pp. 683-684 ◽  
Author(s):  
K. Yamada ◽  
M. Matsuda ◽  
K. Kakurai ◽  
T.R. Thurston ◽  
Y. Endoh ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Magnetic Structures ◽  
Related Compounds

Strong Mn-Mn distance dependence of the Mn interlayer coupling inSmMn2Ge2-related compounds and its role in magnetic phase transitions

1994 ◽  
Vol 50 (22) ◽  
pp. 16410-16417 ◽  
Author(s):  
J. H. V. J. Brabers ◽  
A. J. Nolten ◽  
F. Kayzel ◽  
S. H. J. Lenczowski ◽  
K. H. J. Buschow ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Magnetic Phase ◽  
Interlayer Coupling ◽  
Magnetic Phase Transitions ◽  
Distance Dependence ◽  
Related Compounds
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