Preferred orientation in pyrolytic carbons and polymers

It has been found that the relation of integrated intensities of the 00l reflections of pyrolytic carbons to the uniaxial orientation is amenable to a theoretical treatment. The resulting expression is rather simple and permits the evaluation of commonly used anisotropy factors, such as 〈sin²φ〉 or the Bacon anisotropy factor, from measurements of integrated intensities at two different orientation angles (φ). The applicability of the equation has been tested with data involving 44 pyrolytic carbons covering a wide range of anisotropy. The same relation has also been found to be applicable to a nylon polymer.