A facile novel synthesis of delafossite CuFeO2 powders

Moharam, M. M.; Rashad, M.M.; Elsayed, E. M.; Abou-Shahba, R. M.

doi:10.1007/s10854-014-1801-x

Cited by 31 publications

(18 citation statements)

References 29 publications

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“…Further, the IS does not show variation for the different samples indicating constancy of s electron charge density at Fe 3+ nucleus on Al 3+ substitution (x) in the system. The calculated IS value for paramagnetic singlet corresponds to delafossite phase is found to be 0.39 mm/s, in good agreement with the literature [6].…”

Section: Resultssupporting

confidence: 88%

“…The lower value of H A compared to H B (Fig. 3) is due to more covalent nature of the Fe 3+ -O 2− bonds at the A site compared to those at the B site [6]. Since, the diamagnetic Al 3+ ions replaces magnetic Fe 3+ ions at the B sites and due to the prominent super exchange interaction, the super-transferred hyperfine field, H ST H F , at the A sites is influenced to a greater extent.…”

Section: Resultsmentioning

confidence: 93%

“…Delafossite is usually a secondary mineral that crystallizes near oxidized copper and is rarely a primary mineral [5]. Pure polycrystalline CuFeO 2 found several applications [6], but in CuFe 2 O 4 -based spinel ferrite systems, its presence is rather undesirable.…”

Section: Introductionmentioning

confidence: 99%

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Study on Mössbauer Signature, Hyperfine Interaction Parameters and Removal of Delafossite Phase of Al3+-Modified Copper Ferrite

Modi

Shah

Kathad

et al. 2014

J Supercond Nov Magn

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The effect of Al 3+ substitution on Mössbauer signature and hyperfine interaction parameters of copper ferrite (CuFe 2 O 4 ) is studied at 300 K. The X-ray powder diffraction pattern analysis shows that all the four compositions of the ferrite system CuAl x Fe 2−x O 4 (x = 0.0, 0.2, 0.4, and 0.6) have single-phase fcc spinel structure. On the other hand, Mössbauer spectral analysis reveals that x = 0.0 and 0.2 compositions possess paramagnetic singlet of delafossite (CuFeO 2 ) phase along with two magnetic sextets of spinel ferrite phase. On Al 3+ substitution for Fe 3+ in the system (x ≥ 0.4), formation of this secondary unwanted phase of CuFeO 2 is found to be prevented. The hyperfine interaction parameters are determined and found to be influenced by Al 3+ substitution. The noncollinear spin arrangement in the system is verified and the actual cationic distributions are suggested.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 93%

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Study on Mössbauer Signature, Hyperfine Interaction Parameters and Removal of Delafossite Phase of Al3+-Modified Copper Ferrite

Modi

Shah

Kathad

et al. 2014

J Supercond Nov Magn

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“…This hybridization is possible because the energy level of Cu 3d 10 is close to that of O 2p. Subsequently, several other types of delafossites with the structure CuMO 2 (M = Al [26][27][28], Cr [29][30][31], Ga [32][33][34], In [35][36][37], Sc [38][39][40], Y [41][42][43], Fe [44][45][46], and B [47][48][49]) and delafossite-related oxide SrCu 2 O 2 [50][51][52] have been investigated. In 2001, the delafossite with a rather high p-type conductivity of 220 S•cm −1 was achieved by Mg-doped CuCrO 2 , but the transparency is not satisfying [30].…”

Section: Introductionmentioning

confidence: 99%

Transparent p-Type Semiconductors: Copper-Based Oxides and Oxychalcogenides

2019

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While p-type transparent conducting materials (TCMs) are crucial for many optoelectronic applications, their performance is still not satisfactory. This has impeded the development of many devices such as photovoltaics, sensors, and transparent electronics. Among the various p-type TCMs proposed so far, Cu-based oxides and oxychalcogenides have demonstrated promising results in terms of their optical and electrical properties. Hence, they are the focus of this current review. Their basic material properties, including their crystal structures, conduction mechanisms, and electronic structures will be covered, as well as their device applications. Also, the development of performance enhancement strategies including doping/co-doping, annealing, and other innovative ways to improve conductivity will be discussed in detail.

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“…9) Besides, CuFeO 2 powders have been synthesized via a facile one step hydrothermal method at 180°C for 24 64 h. 10) It has also been successfully formed by using hydrazine hydrate as a reducing agent. The reaction temperatures are 150280°C, and reaction time is 2496 h. 11) From the reports above, although the CuFeO 2 has been synthesized by the hydrothermal reaction, the high temperature, high pressure or long reaction time are also needed. While, the microwave hydrothermal reaction method can combine the advantages of hydrothermal reaction and microwave heating, which can promote the reaction going at relative low temperature in a very short duration.…”

Section: Introductionmentioning

confidence: 99%

The synthesis and microstructure of CuFeO<sub>2</sub> powders via microwave hydrothermal reaction

Zhai

Wang

et al. 2019

J. Ceram. Soc. Japan

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The CuFeO 2 powders have been synthesized by the microwave hydrothermal reaction at different reaction temperatures. The pure rhombohedral phase for CuFeO 2 has been formed and confirmed by the X-ray diffraction (XRD). The microstructure and morphology for all CuFeO 2 samples have been scanned by the Transmission Electronic Microscope (TEM). Various scales of grains for powders have been found spanning from several nanometers to hundreds of nanometers, and even few scales are over 1¯m for some grains. The average grain sizes for all powders have been calculated basing on the XRD patterns to show the changing of grain sizes with the temperature. The distributions of the grain size have also been studied by counting grain numbers from the TEM images. Based on the above results, the mechanism of grain growth has been analyzed and found to be the classical Ostwald ripening.

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A facile novel synthesis of delafossite CuFeO2 powders

Cited by 31 publications

References 29 publications

Study on Mössbauer Signature, Hyperfine Interaction Parameters and Removal of Delafossite Phase of Al3+-Modified Copper Ferrite

Study on Mössbauer Signature, Hyperfine Interaction Parameters and Removal of Delafossite Phase of Al3+-Modified Copper Ferrite

Transparent p-Type Semiconductors: Copper-Based Oxides and Oxychalcogenides

The synthesis and microstructure of CuFeO<sub>2</sub> powders via microwave hydrothermal reaction

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