Effect of different barium concentrations in KCl crystals on X-ray diffuse scattering

✍ Scribed by I. S. Braude; L. M. Rogozyanskaya; V. I. Startsev

• Publisher: John Wiley and Sons
• Year: 1975
• Tongue: English
• Weight: 473 KB
• Volume: 10
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.19750100212

✦ Synopsis

Abstract

Using the X‐ray diffuse scattering technique, KCl crystals with various Ba impurity concentrations (0.0027–0.353 at. %) have been studied. Isointensity curves for all the crystals studied were constructed, which permitted discovering a strong concentration dependence of the diffuse scattering intensity. Starting with 0.0027 at. % Ba the Guinier‐Preston zones appear in the {100} planes. At higher Ba concentrations their number (up to 7 planes in the zone) and sizes increase.

The limiting Ba solubility in the KCl lattice is shown to be less than 0.0025 at. %. The diffuse spot elongation in the 〈130〉 directions at Ba concentration of 0.012 at. % results from diffraction effects of summation of spaces stress vectors acting in the 〈100〉 direction. The analysis of non‐uniform Ba distribution in KCl gave the form and character of segregates which are described by a two‐phase model. Shown is the effect of various impurity concentrations on the coherent coupling of the substance and matrix.