The electrical modulus and other dielectric properties by the impedance spectroscopy of LaCrO3and LaCr0.90Ir0.10O3perovskites

Coșkun, M.; Polat, Özgür; Coşkun, Fatih Mehmet; Durmuș, Z.; Çağlar, Müjdat; Türüt, A.

doi:10.1039/c7ra13261a

Cited by 200 publications

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“…The characteristic peaks, corresponding to the (100), (110), (111), (200), (210), (211), (200), (310) planes are recorded, which corresponds well to standard patterns (PDF number: 75-0441) for the LaCrO 3 single phase with orthorhombic pbnm structure. [21,22] Energy dispersive X-ray spectroscopy (EDS) presents a quantitative elemental analysis of the catalyst in Figure S1 Figure 1(e). The particles exhibit a regular morphology consisting in platelets, round edges and a homogenous size distribution with an average particle size of~200 nm.…”

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confidence: 99%

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Electrochemical Synthesis of Ammonia Based on a Perovskite LaCrO₃ Catalyst

et al. 2019

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Electrochemical synthesis of ammonia through the nitrogen reduction reaction (NRR) has the possibility to revolutionize our production of ammonia and to save our planet from both emissions and large energy consumption. In this study, a perovskite structured lanthanum chromite catalyst (LaCrO 3 ) is synthesized, characterized as well as electrochemically evaluated for NRR. The highest ammonia yield is obtained at À 0.8 V vs. reversible hydrogen electrode with an ammonia formation rate of 24.8 μg h À 1 mg À 1 cat , and a Faradaic efficiency of 15 %. Material calculation further confirms the possible mechanism of ammonia formation with the aid of LaCrO 3 catalyst. The resulting conclusion offers a great alternative with the easily produced and low-cost perovskite structured electrocatalysts for ammonia production.

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“…The valence state of La 3 + is confirmed consistent with the La 3d 5/2 BE. [21] The powders were then evaluated as a catalyst to reduce nitrogen. Firstly, Linear sweep voltammetry (LSV) curves were tested to assess the activity toward NRR.…”

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Electrochemical Synthesis of Ammonia Based on a Perovskite LaCrO₃ Catalyst

et al. 2019

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“…Dielectric loss occurs as polarization lags behind the applied alternating field as well as due to the presence of impurities and structural inhomogeneties. 44,45,49 The ac conductivity of the as prepared samples was calculated using formula, ac ¼ " 0 " o ω tan δ, and has been represented in Figs. 8(a) and 8(b) for pristine compounds and composites, respectively as a function of log f (Hz).…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…Furthermore, the ac conductivity tends to attain maximum value with increasing frequency as the immigration of electrons is increased. [39][40][41][42][43][44][45]49 The ac conductivity can be seen increasing with increase in frequency and becomes independent of frequency after a certain value. The lower part of frequency will give direct current conductivity ð dc Þ.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Study of structural and dielectric properties of La0.9Na0.1CrO₃- and Ni0.5Cu0.5Fe₂O₄-based composites

2019

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The preparation of [Formula: see text][Formula: see text]CrO3 (LNCO), [Formula: see text][Formula: see text]Fe2O4 (NCFO) and their composites of the type [Formula: see text] [Formula: see text][Formula: see text]CrO3 (LNCO) [Formula: see text] ([Formula: see text]) [Formula: see text][Formula: see text]Fe2O4 (NCFO) [Formula: see text], 0.50[Formula: see text] through solid state route is reported. From X-ray diffraction data analysis, the parent [Formula: see text][Formula: see text]CrO3 was found to crystallize in orthorhombic structure (Pnma) while [Formula: see text][Formula: see text]Fe2O4 has crystallized into the cubic structure (Fd3[Formula: see text]) further verified via Retvield refinement. The morphology and compositional studies were carried out using field emission scanning electron microscopy (FESEM) and energy dispersive analysis of X-rays (EDAX), respectively. Lattice structure was confirmed via Raman characterization for the prepared samples. The sample formation was further verified through Fourier transform Infra-Red (FTIR) spectroscopy. The dielectric studies reveal the [Formula: see text][Formula: see text]CrO3[Formula: see text] and [Formula: see text][Formula: see text]Fe2O4[Formula: see text] exhibit high dielectric constant. However, their composites show abrupt drop in dielectric constant. The electric modulus study confirmed that the samples exhibit non-Debye character with spread of relaxation time constants.

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“…In principle, the ABO 3 structure should obey the formulae of Goldschmidt's tolerance factor [21], t = 0.71 ( r A + r O ) / ( r B + r O ) . This t-value led to the formation of crystalline structures such as cubic [22], orthorhombic [23], and hexagonal forms [24].…”

Section: General Introduction Of Lacromentioning

confidence: 99%

Pectins as Emulsifying Agent on the Preparation, Characterization, and Photocatalysis of Nano-LaCrO₃

Situmeang¹

2020

Pectins - Extraction, Purification, Characterization and Applications

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The use of environmentally friendly chemicals as the emulsifying agent in the preparation of the advanced materials is a focus and is very interesting to do. Although the focus is important, the advanced material that is made remains a top priority regarding characterization and its activity. One of the chemicals for making advanced and environmentally friendly materials such as LaCrO 3 perovskite is pectin functioning as the emulsifying agent. In general, perovskite compounds are materials with very wide applications such as fuel cells, electronic equipment, sensors, magnetic materials, photoluminescent materials, thermic catalysts, and photocatalysts. Furthermore, the use of various solvents to produce perovskite compounds with the aim of getting good applications has been done a lot such as water, alcohols, or other organic solvents, respectively, in mixing precursors directly, precipitation and coprecipitation, microwave, auto-combustion, sol-gel, and hydrothermal methods. In this chapter, preparation of LaCrO 3 using pectin as an emulsifying agent will be discussed in advance together with characterization and application of LaCrO 3 in the photocatalytic reaction of dyes and cellulose conversion.

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The electrical modulus and other dielectric properties by the impedance spectroscopy of LaCrO₃and LaCr_0.90Ir_0.10O₃perovskites

Abstract: In this work, LaCrO3 and Ir doped LaCrO3 compounds were synthesized and their frequency dependent electrical properties were studied.

Cited by 200 publications

References 65 publications

Electrochemical Synthesis of Ammonia Based on a Perovskite LaCrO₃ Catalyst

Electrochemical Synthesis of Ammonia Based on a Perovskite LaCrO₃ Catalyst

Study of structural and dielectric properties of La0.9Na0.1CrO₃- and Ni0.5Cu0.5Fe₂O₄-based composites

Pectins as Emulsifying Agent on the Preparation, Characterization, and Photocatalysis of Nano-LaCrO₃

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The electrical modulus and other dielectric properties by the impedance spectroscopy of LaCrO3and LaCr0.90Ir0.10O3perovskites

Abstract: In this work, LaCrO3 and Ir doped LaCrO3 compounds were synthesized and their frequency dependent electrical properties were studied.

Cited by 200 publications

References 65 publications

Electrochemical Synthesis of Ammonia Based on a Perovskite LaCrO3 Catalyst

Electrochemical Synthesis of Ammonia Based on a Perovskite LaCrO3 Catalyst

Study of structural and dielectric properties of La0.9Na0.1CrO3- and Ni0.5Cu0.5Fe2O4-based composites

Pectins as Emulsifying Agent on the Preparation, Characterization, and Photocatalysis of Nano-LaCrO3

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The electrical modulus and other dielectric properties by the impedance spectroscopy of LaCrO₃and LaCr_0.90Ir_0.10O₃perovskites

Electrochemical Synthesis of Ammonia Based on a Perovskite LaCrO₃ Catalyst

Electrochemical Synthesis of Ammonia Based on a Perovskite LaCrO₃ Catalyst

Study of structural and dielectric properties of La0.9Na0.1CrO₃- and Ni0.5Cu0.5Fe₂O₄-based composites

Pectins as Emulsifying Agent on the Preparation, Characterization, and Photocatalysis of Nano-LaCrO₃