Understanding the complex structural features and phase changes in Na 2 Mg 2 (SO 4 ) 3 : A combined single crystal and variable temperature powder diffraction and Raman spectroscopy study
Resumen: Sodium mixed metal sulphates have attracted considerable attention, both in terms of mineralogy and more recently due to interest in Na ion containing materials for battery applications. The phase, Na 2 Mg 2 (SO 4 ) 3 , has been previously reported to undergo a phase change to langbeinite at high temperatures, which is interesting given that usually the langbeinite structure is only adopted when large alkali metal ions, e.g. K, Cs, are present. Nevertheless the room temperature structure of this phase has remained elusive, and so in this work, we report a detailed structural study of this system. We show that room temperature Na 2 Mg 2 (SO 4 ) 3 can only be prepared by quenching from high temperature, with slow cooling leading to phase separation to give the previously unreported systems, Na 2 Mg(SO 4 ) 2 and Na 2 Mg 3 (SO 4 ) 4 . We report the structures of quenched Na 2 Mg 2 (SO 4 ) 3 (monoclinic, P2 1 ), as well as Na 2 Mg(SO 4 ) 2 (triclinic, P1¯) and Na 2 Mg 3 (SO 4 ) 4 (orthorhombic, Pbca), detailing their complex structural features. Furthermore, we report a study of the thermal evolution of quenched Na 2 Mg 2 (SO 4 ) 3 with temperature through variable temperature XRD and Raman studies, which shows a complex series of phase transitions, highlighting why this phase has proven so elusive to characterise previously, and illustrating the need for detailed characterisation of such sulphate systems.
Idioma: Inglés
DOI: 10.1016/j.jssc.2019.02.014
Año: 2019
Publicado en: JOURNAL OF SOLID STATE CHEMISTRY 272 (2019), 157-165
ISSN: 0022-4596

Factor impacto JCR: 2.726 (2019)
Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 14 / 45 = 0.311 (2019) - Q2 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 87 / 158 = 0.551 (2019) - Q3 - T2

Factor impacto SCIMAGO: 0.559 - Ceramics and Composites (Q2) - Condensed Matter Physics (Q2) - Physical and Theoretical Chemistry (Q2) - Inorganic Chemistry (Q2) - Materials Chemistry (Q2) - Electronic, Optical and Magnetic Materials (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2016-77769R
Tipo y forma: Artículo (PostPrint)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)

Creative Commons Debe reconocer adecuadamente la autoría, proporcionar un enlace a la licencia e indicar si se han realizado cambios. Puede hacerlo de cualquier manera razonable, pero no de una manera que sugiera que tiene el apoyo del licenciador o lo recibe por el uso que hace. No puede utilizar el material para una finalidad comercial. Si remezcla, transforma o crea a partir del material, no puede difundir el material modificado.


Exportado de SIDERAL (2020-07-16-08:52:35)


Visitas y descargas

Este artículo se encuentra en las siguientes colecciones:
Artículos



 Registro creado el 2020-02-17, última modificación el 2020-07-16


Postprint:
 PDF
Valore este documento:

Rate this document:
1
2
3
 
(Sin ninguna reseña)