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Critical evaluation of the Lotgering degree of orientation texture indicator

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Abstract

Preferred orientation in textured ceramics is often assessed by comparing the relative intensities of x-ray diffraction reflections to those of a randomly oriented ceramic using the Lotgering degree of orientation (f). However, this paper provides evidence that indiscriminate assessments of f can be misleading. Using measured intensities of a modestly textured tape cast bismuth titanate (Na0.5Bi4.5Ti4O15) ceramic, calculated f values vary from 7.4 to 73.2% depending on the reflections included in the calculation. The texture is also quantified by calculating the orientation distribution function (ODF) using measured pole figures. A model is then presented that demonstrates f is nonlinear with the multiple of preferred (00l)-orientations, the standard unit of the 00l pole figure.

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  1. Materials Science and Engineering, Purdue University, West Lafayette, Indiana, 47907, USA

    Jacob L. Jones, Elliott B. Slamovich & Keith J. Bowman

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  1. Jacob L. Jones
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  2. Elliott B. Slamovich
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  3. Keith J. Bowman
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Jones, J.L., Slamovich, E.B. & Bowman, K.J. Critical evaluation of the Lotgering degree of orientation texture indicator. Journal of Materials Research 19, 3414–3422 (2004). https://doi.org/10.1557/JMR.2004.0440

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