Preferential occupancy of Ca2+ dopant in La1-x Ca x InO3-δ (x = 0–0.20) perovskite: structural and electrical properties

Abstract

Ca-doped LaInO 3 (LCI) has been synthesized by conventional solid-state reaction method. The structural features were investigated by X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The structural investigation indicated that Ca 2+ dopants occupy both A-and B-sites in ABO 3 (La 1-x In x O 3-δ ). The solid solubility limit has been observed up to x = 0.10 for La 1-x Ca x InO 3-δ system. In addition, the Raman band softening has been observed with Ca-doping. The impedance spectroscopy shows that 10 mol% of Ca-doped LaInO 3 possesses the highest conductivity of the order of 1.64 mS cm −1 at 700°C among all investigated samples. The activation energy of doped samples lies within the range of 0.69-0.86 eV, which indicates that the conductivity in the reported samples is mainly contributed by ion transportation. SEM analysis supports the well-packed grains in the sintered samples.

Experimental and Theoretical Study of the Electronic Structures of Lanthanide Indium Perovskites LnInO3

“…There is a growing interest in lanthanide indium perovskites LnInO 3 related to their applications as phosphor materials, − oxygen ion conductors, − and photocatalysts . An all-perovskite field-effect transistor using LaInO 3 as the gate material has also been reported .…”

Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route

“…Again, the shift in binding energy most likely originates from different surrounding of Ca ions due to the decrease in coordination number as oxygen vacancies are introduced. Although Sood et al[51]…”

Spectroscopic and transport properties of Ba‐ and Ti‐doped BaLaInO4

“…The band ν 9 can be assigned as A 1g , [51] and it relates to the stretching vibration of In-contained polyhedra. [57][58][59] As we can see (Figures 2 and 3), the shift of ν 7 and ν 8 bands in the area of high wavenumbers is registered only in the spectra of donor-doped samples, and the shift of ν 10 and ν 11 bands in the area of low wavenumbers is observed in the spectra of both acceptor and donor-doped samples. The shift of ν 9 band in the high-wavenumbers area and the absence of ν 10 and ν 11 bands in the spectra of doped sample BaLaIn 0.95 Ti 0.05 O 4.025 can be ascribe as a result of the overlapping of several signals in this wavenumbers area.…”

“…The band ν 9 can be assigned as A 1 g , [ 51 ] and it relates to the stretching vibration of In‐contained polyhedra. [ 57–59 ]…”