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Effect of H_2O on dielectric properties of berlinite. I. Dielectric constant

Shannon, R. D. and Vega, A. J. and Chai, B. H. T. and Rossman, G. R. (1993) Effect of H_2O on dielectric properties of berlinite. I. Dielectric constant. Journal of Physics D: Applied Physics, 26 (1). pp. 93-100. ISSN 0022-3727.

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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 k^(T)_(11) ranging from 4.67 to 4.86 and k^(T)_(33) from 4.54 to 4.76. The extrapolated values for 'dry' berlinite are k^(S)_(11)= k^(S)_(33)=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/H_(3)PO_4 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 k^(S)_(11) and k^(T)_(33) to 4.8 over the dry value of 4.55.

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Rossman, G. R.0000-0002-4571-6884
Additional Information:© 1993 IOP Publishing Ltd. Received 25 February 1992; in final form 3 September 1992. We thank E Philippot, RA Laudise and S Mroczkowski for providing several of the AIPO_4 crystals, R W Shiffer for sample preparation, R A Oswald for capacitance measurements, M Van Kavelaar for scanning electron micrographs and J L Boley for assistance with the infrared acquisition. This work was supported in part by NSF grants EAR-8618200 and EAR-8916064.
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Issue or Number:1
Classification Code:PACS: 77.22.Ch, 61.72.Qq, 77.84.Fa KDP-, 02.60.Ed, 73.20.At
Record Number:CaltechAUTHORS:20140226-093948188
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Official Citation:Effect of H2O on dielectric properties of berlinite. I. Dielectric constant R D Shannon et al 1993 J. Phys. D: Appl. Phys. 26 93
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44007
Deposited By: Jason Perez
Deposited On:26 Feb 2014 18:48
Last Modified:03 Oct 2019 06:13

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