Tuning two-dimensional phase formation through epitaxial strain and growth conditions: silica and silicate on Ni_xPd_1−x(111) alloy substrates

Abstract

The combined experimental and theoretical results demonstrate the manipulation of 2D VDW silica and 2D Ni silicate through growth conditions, and the determination of the maximum epitaxial strain imparted to the 2D system through alloy substrate.

Phonons as a platform for non-Abelian braiding and its manifestation in layered silicates

“…The experimental realisation of monolayer Kagome silicates can be dated back to the 1990s 43 , but more recently various synthesis strategies have been developed to obtain 2D Kagome silicate or silica on multiple substrates [44][45][46][47][48] . These developments enable researchers to study the structural [49][50][51][52][53][54][55] , vibrational [56][57][58] , electronic [59][60][61] , mechanical 62,63 , and chemical properties 64 of this material family and to explore the various physical phenomena associated with 2D Kagome lattices.…”

“…56 , and structural relaxation at different electric fields always removes the rotation distortion. Experimentally it has been found that both monolayer silicate and bilayer silica can be grown on various substrates with biaxial strains varying from −5.6 to 5.7% 44,48,52,53,64,65 . In addition, theoretical calculations have shown that defect-free 2D silica can be deformed up to a maximum strain of 10.4%, while for defective samples no abrupt material failure is observed at strains around 7.8-8.1% 63 .…”

Two-Dimensional Ultrathin Silica Films

“…As reported by Altman et al, the lattice mismatch is vital to controlling bilayer silica structures. , The incorporation of the Al 3+ ion then provides an additional possibility for structure control via strain. However, the appearance of the amorphous phase and the spatial variations in the Al concentration remain challenges that must be surmounted in the preparation of specifically desired aluminosilicates.…”

“…We recall that highly crystalline BL silica films can be grown on Ni x Pd 1– x (111) alloy surfaces with a continuously tunable lattice constant . Altman and co-workers further showed that the reactions of Si and O with the Ni x Pd 1– x (111) alloy surface would extract Ni atoms from the substrate to form 2D Ni-silicates. , …”

“…The quality of the created films, naturally, depends on structural parameters at the support interface and the formed oxide. , Once well-structured systems have been formed, they may be studied at the atomic level with many spectroscopic and structure determining experimental tools, both in ultrahigh vacuum (UHV) and under ambient conditions, including scattering experiments, vibrational and electronic spectroscopy, diffraction, and scanning probe techniques, as will be covered in section . Subsequently, the system may be modified in a controlled way (Figure b), for example, by substituting the Si atoms with Al or Ti. − Al substitution leads to models mimicking zeolite films.…”