Abstract
The Surface Magnetic Pigment Concentration (SPVC) is measured by XPS analysis to a depth of 50A° and compared to the calculated bulk Pigment Volume Concentration (PVC) of particulate magnetic tape. To obtain the required resolution, a modified Van Cittert Algorithm is used to deconvolute the initial X-ray photoelectron spectra. The SPVC is obtained from the intensity of the O <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1S</inf> ratio of the metal oxide to polymer oxygen, as well as from the ratio of intensity of the metal core electron peak to the polymeric C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1S</inf> peak. The two magnetic pigments studied are acicular ferro magnetic CrO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> and acicular ferri magnetic ΓFe <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> O <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> in a polyester-urethane binder. All particulate tape surfaces analyzed were calendered.
Published Version
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