Effect of annealing temperatures on the structural and crystalline properties of CaTiO3 powder synthesized via conventional solid-state method

AbdulKareem, Samah K.; Ajeel, Sami A.

doi:10.1016/j.matpr.2020.12.647

Cited by 16 publications

(7 citation statements)

References 22 publications

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“…All the peaks are indexed and corresponded very well to the data (PDF#: 00‐062‐0345 and PDF#: 00‐066‐0321) as well as in good agreement with literatures 20,25‐27 . There is no parasitic crystalline phase detectable in all samples before and after annealing, though the enhanced intensities and reduced FWHM of XRD patterns of annealed sample suggested the annealing does improve the crystallinity and/or the growth of crystal size, in a good agreement with that reported in literature 28 . Figure 3 is the SEM pictures of NVP and NVPF before and after annealing, which revealed that particle sizes of both NVP@C and NVPF@C are larger after annealing, corroborating the XRD results, which is in consistence with the literatures 16,29 .…”

Section: Resultssupporting

confidence: 90%

Impacts of fluorine in NASICON‐type materials as cathodes for aqueous zinc ion batteries

Liu

Jia

Cao

2021

Energy Science & Engineering

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Sodium superionic conductor (NASICON)‐type materials are getting more and more attention due to their high capacity and good cycling ability compared with other cathode materials in aqueous zinc ion batteries (AZIB). The present paper was to study the synthesis and electrochemical properties of two NASICON compounds of Na3V2(PO4)3 and Na3V2(PO4)2F3 and to understand the impacts of fluorine. Both Na3V2(PO4)3 and Na3V2(PO4)2F3 are synthesized by hydrothermal growth followed with annealing at 800°C in inert gas. With 3 mol/L Zn(CF3SO3)2 in water as electrolyte, Na3V2(PO4)3 offered a high storage capacity, while Na3V2(PO4)2F3 demonstrated a high discharge voltage though low storage capacity. It was also found that the storage capacity of Na3V2(PO4)2F3 increases with increased cycles; however, the compound undergoes a gradual phase transition. It is discussed possible approaches to attain both high discharge voltage and large capacity with good cycling stability.

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Section: Resultssupporting

confidence: 90%

Impacts of fluorine in NASICON‐type materials as cathodes for aqueous zinc ion batteries

Liu

Jia

Cao

2021

Energy Science & Engineering

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“…Porous CaTi 1– x Fe x O 3−δ was synthesized by solid-state reaction of CaO, TiO 2 , and Fe 2 O 3 at 1500 °C for 2 h with a heating rate of 5 °C ( Figure 1 a) following ref. 27 Stoichiometric amounts of precursor powders with 0 ≤ x ≤ 0.4 were mixed and ground by mortar and pestle and then pressed into pellets. Before sintering, the CaO in the pellets was allowed to react with air, likely forming a combination of Ca(OH) 2 and CaCO 3 , which caused the green body to increase in volume ( Figure 1 a) and ultimately introduced extensive porosity in the sintered ceramic ( Figure 2 ).…”

Section: Methodsmentioning

confidence: 99%

“…Porous CaTi 1– x Fe x O 3−δ was synthesized by solid-state reaction of CaO, TiO 2 , and Fe 2 O 3 at 1500 °C for 2 h with a heating rate of 5 °C (Figure a) following ref . Stoichiometric amounts of precursor powders with 0 ≤ x ≤ 0.4 were mixed and ground by mortar and pestle and then pressed into pellets.…”

Section: Methodsmentioning

confidence: 99%

Nanoscale Iron Redistribution during Thermochemical Decomposition of CaTi_1–xFe_xO_3−δ Alters the Electrical Transport Pathway: Implications for Oxygen-Transport Membranes, Electrocatalysis, and Photocatalysis

Luong

Wang

Tsung

et al. 2023

ACS Appl. Nano Mater.

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Potential applications of the earth-abundant, low-cost, and non-critical perovskite CaTi1–x Fe x O3−δ in electrocatalysis, photocatalysis, and oxygen-transport membranes have motivated research to tune its chemical composition and morphology. However, investigations on the decomposition mechanism(s) of CaTi1–x Fe x O3−δ under thermochemically reducing conditions are limited, and direct evidence of the nano- and atomic-level decomposition process is not available in the literature. In this work, the phase evolution of CaTi1–x Fe x O3−δ (x = 0–0.4) was investigated in a H2-containing atmosphere after heat treatments up to 600 °C. The results show that CaTi1–x Fe x O3−δ maintained a stable perovskite phase at low Fe contents while exhibiting a phase decomposition to Fe/Fe oxide nanoparticles as the Fe content increases. In CaTi0.7Fe0.3O3−δ and CaTi0.6Fe0.4O3−δ, the phase evolution to Fe/Fe oxide was greatly influenced by the temperature: Only temperatures of 300 °C and greater facilitated phase evolution. Fully coherent Fe-rich and Fe-depleted perovskite nanodomains were observed directly by atomic-resolution scanning transmission electron microscopy. Prior evidence for such nanodomain formation was not found, and it is thought to result from a near-surface Kirkendall-like phenomenon caused by Fe migration in the absence of Ca and Ti co-migration. Density functional theory simulations of Fe-doped bulk models reveal that Fe in an octahedral interstitial site is energetically more favorable than in a tetrahedral site. In addition to coherent nanodomains, agglomerated Fe/Fe oxide nanoparticles formed on the ceramic surface during decomposition, which altered the electrical transport mechanism. From temperature-dependent electrical conductivity measurements, it was found that heat treatment and phase decomposition change the transport mechanism from thermally activated p-type electronic conductivity through the perovskite to electronic conduction through the iron oxide formed by thermochemical decomposition. This understanding will be useful to those who are developing or employing this and similar earth-abundant functional perovskites for use under reducing conditions, at elevated temperatures, and when designing materials syntheses and processes.

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“…Calcium titanate CaTiO 3 is an n-type semiconductor 13 with a perovskite structure; it possesses excellent characteristics, such as earth-abundance and non-toxicity of its constituent elements, cost-effective, high dielectric constant, ease of synthesis, and high chemical stability 14 . Several methods have been reported to prepare CaTiO 3 , such as solid-state reaction 15 , co-precipitation 16 , mechano-chemical milling, sol–gel 17 , and hydrothermal process 18 .…”

Section: Introductionmentioning

confidence: 99%

Gamma radiation-induced synthesis of novel PVA/Ag/CaTiO3 nanocomposite film for flexible optoelectronics

Abdel Maksoud,

Abdelhaleem,

Tawfik

et al. 2023

Sci Rep

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A flexible nanocomposite film based on polyvinyl alcohol (PVA), silver nanoparticles, and calcium titanate (CaTiO3) was synthesized using gamma radiation induced-reduction. Temperature-dependent structural, optical, DC electrical conductivity, electric modulus, and dielectric properties of PVA/Ag/CaTiO3 nanocomposite film were investigated. The XRD pattern proved the successful preparation of the nanocomposite film. Also, as the temperature increases, the average crystallite sizes of CaTiO3 and Ag nanoparticles decrease from 19.8 to 9.7 nm and 25 to 14.8 nm, respectively. Further, the optical band gap increased from 5.75 to 5.84 eV with increasing temperature. The thermal stability is improved, and the semiconductor behavior for PVA/Ag/CaTiO3 nanocomposite film is confirmed by thermal activation energy ΔE with values in the 0.11–0.8 eV range. Furthermore, the maximum barrier Wm value was found of 0.29 eV. PVA/Ag/CaTiO3 nanocomposite film exhibits a semicircular arc originating from the material’s grain boundary contributions for all temperatures. The optical, DC electrical conductivity, and dielectric properties of the PVA/Ag/CaTiO3 nanocomposite film can be suitable for flexible electronic devices such as electronic chips, optoelectronics, and energy storage applications.

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Effect of annealing temperatures on the structural and crystalline properties of CaTiO3 powder synthesized via conventional solid-state method

Cited by 16 publications

References 22 publications

Impacts of fluorine in NASICON‐type materials as cathodes for aqueous zinc ion batteries

Impacts of fluorine in NASICON‐type materials as cathodes for aqueous zinc ion batteries

Nanoscale Iron Redistribution during Thermochemical Decomposition of CaTi_1–xFe_xO_3−δ Alters the Electrical Transport Pathway: Implications for Oxygen-Transport Membranes, Electrocatalysis, and Photocatalysis

Gamma radiation-induced synthesis of novel PVA/Ag/CaTiO3 nanocomposite film for flexible optoelectronics

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Effect of annealing temperatures on the structural and crystalline properties of CaTiO3 powder synthesized via conventional solid-state method

Cited by 16 publications

References 22 publications

Impacts of fluorine in NASICON‐type materials as cathodes for aqueous zinc ion batteries

Impacts of fluorine in NASICON‐type materials as cathodes for aqueous zinc ion batteries

Nanoscale Iron Redistribution during Thermochemical Decomposition of CaTi1–xFexO3−δ Alters the Electrical Transport Pathway: Implications for Oxygen-Transport Membranes, Electrocatalysis, and Photocatalysis

Gamma radiation-induced synthesis of novel PVA/Ag/CaTiO3 nanocomposite film for flexible optoelectronics

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Nanoscale Iron Redistribution during Thermochemical Decomposition of CaTi_1–xFe_xO_3−δ Alters the Electrical Transport Pathway: Implications for Oxygen-Transport Membranes, Electrocatalysis, and Photocatalysis