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X-ray Diffraction Studies of Shocked Lunar Analogs

Published online by Cambridge University Press:  06 March 2019

R. E. Hanss ,
B. R. Montague  and
C. P. Galindo
R. E. Hanss
Affiliation:
St. Mary's University San Antonio, Texas 78284
B. R. Montague
Affiliation:
St. Mary's University San Antonio, Texas 78284
C. P. Galindo
Affiliation:
St. Mary's University San Antonio, Texas 78284
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Abstract

X-ray diffractometer studies of single-crystal quartz and orthoclase reveal the peak shock pressure experienced by the samples. This procedure may facilitate tapid, quantitative interpretation of the peak shock pressures experienced by materials occurring in lunar or terrestrial impact structures. Shocked specimens were obtained from the NASA 20 mm flat-plate accelerator at Johnson Space Center, Houston. Orthoclase single crystals were shocked normal to the (001) plane at pressure intervals between 0 and 297 kb. The amplitude of the 27.6° two-theta (002) maximum decreases as a function of increasing shock pressure. Quartz single crystals were shocked normal to the (0001) plane at pressure intervals between 0 and 310 kb. Examination of the peak amplitude/ half-width ratios for the 26.6° two-theta (101) and the 20.8° twotheta (100) reveals a general correlation of these ratios with shock pressure. This method seems appropriate for the calibration of shock pressures experienced by crystalline materials.

Type
X-Ray Diffraction Stress Analysis
Information
Advances in X-Ray Analysis , Volume 20: Twenty-Fifth Annual Conference on Applications of X-ray Analysis, August 4-6, 1976 , 1976 , pp. 337 - 344
Copyright
Copyright © International Centre for Diffraction Data 1976

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References

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