Local structural evolution in the anionic solid solution ZnSex S1-x

Dan, T and Mohanty, A and Dutta, A and Varma, RM and Sarkar, S and Di Marco, I and Eriksson, O and Welter, E and Pollastri, S and Olivi, L and Priolkar, KR and Sarma, DD (2021) Local structural evolution in the anionic solid solution ZnSex S1-x. In: Physical Review B, 104 (18).

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Abstract

The century-old Vegard's law has been remarkably accurate in describing the evolution of the lattice parameters of almost all solid solutions. Contractions or expansions of lattice parameters of such systems depend on the size of the guest atom being smaller or larger than the host atom it replaces to form the solid solution. This has given rise to the concept of "chemical pressure"in analogy to the physical pressure. We have investigated using EXAFS the evolution of the local structure in terms of atom-pair distances extending up to the third-nearest neighbors in the family of compounds, ZnSexS1-x as an example of an anionic solid solution, in contrast to all previous studies focusing on cationic solid solutions. Our results establish several common features between these two types of solid solutions, while strongly suggesting that the concept of a chemical pressure is inaccurate and misleading. Most interestingly, we also find a qualitative difference between the cationic solid solutions, reported earlier, and the anionic solid solution. © 2021 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to American Physical Society.
Keywords:	Atoms; Lattice constants, Cationics; Chemical pressures; Common features; EXAFS; Host atoms; Local structure; Nearest-neighbour; Qualitative differences; Structural evolution; Vegard's law, Solid solutions
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	05 Jan 2022 11:05
Last Modified:	05 Jan 2022 11:05
URI:	http://eprints.iisc.ac.in/id/eprint/70840

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