X‐ray diffraction behaviour of W/Ti superlattices

Abstract

The structural properties of periodic and quasiperiodic W/Ti superlattices have been irivestigat,cd by means of X-ray diffraction. Intensity attenuation of even ordered peaks occurs in the spectra of W/Ti periodic superlattices with near-equal-layer thicknesses. This phenomenon is theoretically explained. Two series of quasiperiodic (Fibonacci) samples are prepared, one with thickness ratio d A / d R = 5 , and the other da/du = l / t . X-ray diffraction results of these quasiperiodic superlattices are discussed and compared. The possible application of Fibonacci films as optical elements in the soft X-ray region is discussed. Flirthermore some X-ray diffraction spectra are simulated by computer calculation in order to understand the detailed structures. The calculated results are in good agreement with measured ones.

Density functional theory investigation of titanium-tungsten superlattices: Structure and mechanical properties

“…Indeed, Pan et al report no difficulties in their efforts to fabricate Ti/W superlattices. [7][8][9] All stacking directions favor W-rich superlattices in agreement with experiment: Ti dissolves more easily in W than vice-versa.…”

“…Pan et al explored an even-extinction phenomenon for Ti/W superlattices with close to equal Ti and W layers in the small 2Θ region of X-ray diffraction patterns. 7 The corresponding effect appears in calculated X-ray diffraction patterns of the relaxed Ti 9 /W 9 superlattices with all stacking directions considered here.…”

“…Alternating layers of Ti and the β-stabilizer tungsten (W) in particular, i.e., Ti/W superlattices, have been experimentally realized to study periodic and Fibonacci quasiperiodic superlattices. [7][8][9] Combining these elements benefits from their bcc phases having close lattice constants, 3.165Å for bcc W, 10 and 3.311Å for β-Ti at 1100…”