X-RAY STUDIES ON THE TEXTURE OF CRYSTALS. A New Method Using Internal Reflections And Its Applications To Lithium Flouride

Abstract

The paper describes a new method of studying crystalline texture, employing internal reflections. It consists in obtaining internal reflection from a wedge-shaped crystal whose thickness varies from top to bottom and determining the variation of integrated reflection with thickness which was shown theoretically by Ramachandran to be different for perfect and mosaic crystals. Experiments were performed with ground, etched and chilled crystals of lithium fluoride and observations were found to be in accordance with the theoretical predictions. Crystals of lithium fluoride, grown from melt, were thus found to be nearly perfect in structure.