Artículo
Tailoring the Band Gap in the ZnS/ZnSe System: Solid Solutions by a Mechanically Induced Self-Sustaining Reaction
Autor/es | Avilés Escaño, Miguel Ángel
Córdoba Gallego, José Manuel Sayagués de Vega, María Jesús Gotor Martínez, Francisco José |
Departamento | Universidad de Sevilla. Departamento de Química Inorgánica |
Fecha de publicación | 2019 |
Fecha de depósito | 2022-09-28 |
Publicado en |
|
Resumen | The complete ZnSxSe1−x solid solution was
successfully obtained by the mechanochemical process denoted
as a mechanically induced self-sustaining reaction. Excellent
control of the chemical stoichiometry of the solid ... The complete ZnSxSe1−x solid solution was successfully obtained by the mechanochemical process denoted as a mechanically induced self-sustaining reaction. Excellent control of the chemical stoichiometry of the solid solution was possible by adjusting the atomic ratio of the starting Zn/S/Se elemental mixture subjected to milling. A mixture of both wurtzite-2H (hexagonal) and zinc blende (cubic) structures was always obtained, although for a similar milling time the proportion of the zinc blende structure increased with the Se content in the solid solution. However, wurtzite was the major phase for S-rich compositions when milling was stopped just after ignition. It was demonstrated that milling induces the wurtzite-to-zinc blende phase transition. The 8H hexagonal polytype was also observed in samples subjected to long milling times. Variation of the lattice parameters for both structures with the x value in the solid solution presented an excellent linearity, confirming the validity of Vegard’s law. However, variation of the band-gap energy (Eg) with x was not perfectly linear, and a small bowing parameter of 0.34 was obtained. It was possible to tune the Eg value between those of the end members of the solid solution in a continuous manner by adjusting the stoichiometry of the solid solution. The morphology and crystalline domain size can also be controlled by adjusting, in this case, the postignition milling time of the mechanochemical process. |
Agencias financiadoras | European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) Ministerio de Ciencia e Innovación (MICIN). España |
Identificador del proyecto | RYC-2013-12437 |
Cita | Avilés Escaño, M.Á., Córdoba Gallego, J.M., Sayagués de Vega, M.J. y Gotor Martínez, F.J. (2019). Tailoring the Band Gap in the ZnS/ZnSe System: Solid Solutions by a Mechanically Induced Self-Sustaining Reaction. Inorganic Chemistry, 58 (4), 2565-2575. |
Ficheros | Tamaño | Formato | Ver | Descripción |
---|---|---|---|---|
ZnS-ZnSe solid solution.pdf | 1.624Mb | [PDF] | Ver/ | Es versión aceptada del artículo publicado. |