Correlation between Structure, Chemistry, and Dielectric Properties of Iron-Doped Gallium Oxide (Ga_2–xFe_xO₃)

Abstract

Iron (Fe)-doped gallium oxide (Ga2O3) compounds (Ga2–x Fe x O3; x = 0.0–0.3; referred to GFO) were synthesized by the standard high-temperature solid-state chemical reaction method. X-ray diffraction analyses confirmed that the sintered GFO compounds stabilized in monoclinic crystal structure with C2/m space group. Local structure and chemical bonding analyses using XANES revealed that the Fe occupies octahedral and tetrahedral sites similar to Ga in parent Ga2O3 lattice without considerable changes in the local symmetry. Morphology of the GFO compounds is characterized by the presence of rod-shaped particle (from around 2.0–3.5 μm) features. The energy dispersive X-ray spectroscopy confirmed the chemical stoichiometry of the GFO compounds, where the atomic ratio of the constituted elements is in accordance with the calculated concentration values. The frequency- and temperature-dependent dielectric properties of the GFO compounds exhibited the traditional dielectric dispersion behavior. Relatively high dielectric constant at lower frequencies is attributed to Maxwell–Wagner type of dielectric relaxation, which primarily originated from uncompensated charges at electrode material interface. On the basis of the results and analyses, the effect of Fe content on the crystal structure, chemical bonding and local structure, and dielectric properties of Ga2–x Fe x O3 compounds is established.

Electronic Structure, Chemical Bonding, and Electrocatalytic Activity of Ba(Fe0.7Ta0.3)O3−δ Compounds

“…The high-resolution XPS scan of the Fe 2p region (Figure ) presents interesting features revealing the characteristic Fe bonding and chemical state in BFTO compounds synthesized at different sintering temperatures. The presence of the characteristic doublet of Fe 2p, i.e., Fe 2p 3/2 and Fe 2p 1/2 peaks, due to spin–orbit splitting ,− can be seen for all of the BFTO compounds. However, their evolution, in terms of peak shape, etc., is different and interesting to learn about the chemical state and bonding environment of Fe in BFTO.…”

Chemical composition tuning induced variable and enhanced dielectric properties of polycrystalline Ga2‐2xWxO3 ceramics

“…Sustained efforts have proved a red shift in optical bandgap as reported for W‐incorporated β ‐Ga 2 O 3 39 and Ti‐incorporated β ‐Ga 2 O 3 40 polycrystalline thin films. Detailed structural analyses of Fe‐alloyed Ga 2 O 3 reveal the effect of Fe 3+ substitution in Ga 3+ in octahedral and tetrahedral positions owing to its closeness in Shannon ionic radii 43 . A strong correlation was established between the chemical composition, crystal structure and dielectric properties with reference to the selected doping conditions and parameters 43 .…”

“…43 A strong correlation was established between the chemical composition, crystal structure and dielectric properties with reference to the selected doping conditions and parameters. 43 In the present work, we investigate in detail and explore the properties of W-mixed Ga 2 O 3 (GWO) polycrystalline compounds with a strong focus on understanding their dielectric and electrical transport properties. Interestingly, as presented and discussed in this paper, our results demonstrate that the W-content into Ga 2 O 3 induces enhancement in the dielectric properties of the GWO compounds.…”

“…Detailed structural analyses of Fe‐alloyed Ga 2 O 3 reveal the effect of Fe 3+ substitution in Ga 3+ in octahedral and tetrahedral positions owing to its closeness in Shannon ionic radii 43 . A strong correlation was established between the chemical composition, crystal structure and dielectric properties with reference to the selected doping conditions and parameters 43 . In the present work, we investigate in detail and explore the properties of W‐mixed Ga 2 O 3 (GWO) polycrystalline compounds with a strong focus on understanding their dielectric and electrical transport properties.…”

Electrodeposition of Hybrid Magnetostrictive/Magnetoelectric Layered Systems

“…GFO has been synthesized using different techniques, such as the floating-zone method [6], sol-gel [11][12][13], solid state route [14][15][16][17][18] and solid-state chemical reaction [19]. High-quality, thin films have been obtained when using pulsed laser deposition (PLD) [7,[20][21][22][23], but industrial methods are needed for massive production.…”