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Dielectric Loss in Vanadyl Pnictates

Published online by Cambridge University Press:  28 February 2011

Joseph F. Lomax ,
John J. Fontanella ,
Mary C. Wintersgill  and
Anthony Kotarski
Joseph F. Lomax
Affiliation:
Chemistry Department, United States Naval Academy, Annapolis, MD 21402
John J. Fontanella
Affiliation:
Physics Department, United States Naval Academy, Annapolis, MD 21402
Mary C. Wintersgill
Affiliation:
Physics Department, United States Naval Academy, Annapolis, MD 21402
Anthony Kotarski
Affiliation:
Physics Department, United States Naval Academy, Annapolis, MD 21402
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Abstract

The 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990 , 681
Copyright
Copyright © Materials Research Society 1991

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