Limits of Solid Solution and Evolution of Crystal Morphology in (La1-XREX)FeO3 Perovskites by Low Temperature Hydrothermal Crystallization

Jia, Lu1,2; Lloyd, Matthew D.1; Lees, Martin R.3; Huang, Limin2; Walton, Richard I.1

2023-03-01

10.1021/acs.inorgchem.2c04325

INORGANIC CHEMISTRY   Impact Factor & Quartile

0020-1669

1520-510X

The crystallization of a new series of A-site substituted lanthanum ferrite materials (La1-xREx)FeO3 was explored by the hydrothermal method at 240 degrees C, for rare earth (RE) = Nd, Sm, Gd, Ho, Er, Yb, and Y, with 0 < x < 1. The effect of elemental substitution on the morphological, structural, and magnetic properties of the materials was studied using high-resolution powder X-ray diffraction, energy dispersive spectroscopy (EDS) on the scanning electron microscope, Raman spectroscopy, and SQUID magnetometry. If the radius of the La3+ and the substituent ions is similar, such as for Nd3+, Sm3+, and Gd3+, homogeneous solid solutions are formed, with the orthorhombic GdFeO3-type structure, and a continuous evolution of Raman spectra with composition and distinct magnetic behavior from the end members. When the radius difference between substituents and La3+ is large, such as for Ho3+, Er3+, Yb3+, and Y3+, then instead of forming solid solutions, crystallization in separate phases is found. However, low levels of element mixing are found and intergrowths of segregated regions give composite particles. In this case, the Raman spectra and magnetic behavior are characteristic of mixtures of phases, while EDS shows distinctive elemental segregation. A-site replacement induces an evolution in the crystallite shape with an increasing amount of substituent ions and this is most evident for RE = Y from cube-shaped crystals seen for LaFeO3 to multipodal crystals for (La1-xYx)FeO3, providing evidence for a phase-separation-driven evolution of morphology.

SCI

English

NI Journal Papers

Others

null[JCYJ20220818100212027] ; null[2020B121201002]

Chemistry

Chemistry, Inorganic & Nuclear

WOS:000945887300001

AMER CHEMICAL SOC

CHEMISTRY

Web of Science

1.Univ Warwick, Dept Chem, Coventry CV4 7AL, England
2.Southern Univ Sci & Technol, Dept Chem, Shenzhen 518055, Peoples R China
3.Univ Warwick, Dept Phys, Coventry CV4 7AL, England

Jia, Lu,Lloyd, Matthew D.,Lees, Martin R.,et al. Limits of Solid Solution and Evolution of Crystal Morphology in (La1-XREX)FeO3 Perovskites by Low Temperature Hydrothermal Crystallization[J]. INORGANIC CHEMISTRY,2023.

Jia, Lu,Lloyd, Matthew D.,Lees, Martin R.,Huang, Limin,&Walton, Richard I..(2023).Limits of Solid Solution and Evolution of Crystal Morphology in (La1-XREX)FeO3 Perovskites by Low Temperature Hydrothermal Crystallization.INORGANIC CHEMISTRY.

Jia, Lu,et al."Limits of Solid Solution and Evolution of Crystal Morphology in (La1-XREX)FeO3 Perovskites by Low Temperature Hydrothermal Crystallization".INORGANIC CHEMISTRY (2023).