Effect Of H2O On Dielectric-Properties Of Berlinite .1. Dielectric-Constant

    Authors

    R. D. Shannon; A. J. Vega; B. H. T. Chai;G. R. Rossman

    Comments

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    Abbreviated Journal Title

    J. Phys. D-Appl. Phys.

    Keywords

    Quartz; Defects; Water; Alpo4; Mgo; Physics, Applied

    Abstract

    The dielectric constants of a series of hydrothermally grown berlinite crystals containing increasing amounts of H2O were determined using a two-terminal method and empirically determined edge corrections with kappa11T ranging from 4.67 to 4.86 and kappa33T from 4.54 to 4.76. The extrapolated values for 'dry' berlinite are kappa11S = kappa33S = 4.55. Infrared studies of these crystals show bands at 4400 and 5200 cm-1 which are attributed respectively to hydroxyl ions and macroscopic and microscopic inclusions of the 6-7 M HCl/H3PO4 growth medium. The hydroxyl ions are believed to result from terminal P-OH groups at the surfaces of inclusions or as (4H)Al or (3H)Al hydroxyl nests. The OH- groups have a negligible influence on the dielectric constant, whereas the inclusions are responsible for the increase in kappa11S and kappa33T to 4.8 over the dry value of 4.55.

    Journal Title

    Journal of Physics D-Applied Physics

    Volume

    26

    Issue/Number

    1

    Publication Date

    1-1-1993

    Document Type

    Article

    Language

    English

    First Page

    93

    Last Page

    100

    WOS Identifier

    WOS:A1993KH16700015

    ISSN

    0022-3727

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