Characteristics of Fe- and Mg-doped CuCrO2 nanocrystals prepared by hydrothermal synthesis

Kaya, İsmail Cihan; Sevindik, Mehmet Alper; Akyıldız, Hasan

doi:10.1007/s10854-015-4038-4

Cited by 19 publications

(22 citation statements)

References 46 publications

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“…The obtained energy value is consistent with the literature [84] and shows a wide band gap which avoids the simultaneous presence of the electron and hole in their specific bands and drives to a high Seebeck coefficient even at high temperatures. A similar indirect band gap value was obtained by Chikoidze et al [83] and Kaya et al [99]. …”

Section: Resultssupporting

confidence: 88%

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

et al. 2017

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P-type Mg doped CuCrO2 thin films have been deposited on fused silica substrates by Radio-Frequency (RF) magnetron sputtering. The as-deposited CuCrO2:Mg thin films have been annealed at different temperatures (from 450 to 650 °C) under primary vacuum to obtain the delafossite phase. The annealed samples exhibit 3R delafossite structure. Electrical conductivity σ and Seebeck coefficient S of all annealed films have been measured from 40 to 220 °C. The optimized properties have been obtained for CuCrO2:Mg thin film annealed at 550 °C. At a measurement temperature of 40 °C, this sample exhibited the highest electrical conductivity of 0.60 S·cm−1 with a Seebeck coefficient of +329 µV·K−1. The calculated power factor (PF = σS²) was 6 µW·m−1·K−2 at 40 °C and due to the constant Seebeck coefficient and the increasing electrical conductivity with measurement temperature, it reached 38 µW·m−1·K−2 at 220 °C. Moreover, according to measurement of the Seebeck coefficient and electrical conductivity in temperature, we confirmed that CuCrO2:Mg exhibits hopping conduction and degenerates semiconductor behavior. Carrier concentration, Fermi level, and hole effective mass have been discussed.

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Section: Resultssupporting

confidence: 88%

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

et al. 2017

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“…This observation demonstrates that the highest achievable doping levels without the formation of any secondary phases limited to 3 at.% Mg, under the experimental conditions applied. Similar results were also reported for hydrothermally produced Mg‐ and Fe‐doped CuCrO 2 nanocrystals . A much lower solubility limit (1 at.%) was given for Mg‐doped CuCrO 2 bulk samples prepared via sintering at 1200 °C in air .…”

Section: Resultsmentioning

confidence: 99%

“…XRD analysis was primarily used to determine the crystal structure and phase distribution of the as-synthesized fibers. [38] A much lower solubility limit (1 at.%) was given for Mg-doped CuCrO 2 bulk samples prepared via sintering at 1200 C in air. [39] In addition, lattice parameter calculations revealed a slight decrease in the c-axis up to 3 at.% Mg-doping (17.003, 16.992, and 16.920 Åfor un-doped, x ¼ 0.01 and x ¼ 0.03, respectively).…”

Section: Resultsmentioning

confidence: 99%

Production and Characterization of Magnesium‐Doped Copper Chromite Fibers

Kaya

Akyıldız

2017

Physica Status Solidi (a)

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In this study, Mg‐doped CuCr1−xMgxO2 (x = 0, 0.01, 0.03, 0.05) fibers are synthesized via electrospinning process followed by a two‐step heat treatment in air and Ar atmospheres. The produced samples are all crystalline with a fiber diameter ranging from 120 to 140 nm. The effect of Mg2+ substitution for Cr3+ on the structural, morphological, and optical properties of CuCrO2 fibers is investigated systematically. Structural characterizations indicate that the solubility limit of Mg2+ is around 3 at.% and beyond this concentration the formation of MgO phase is observed. This also leads to the formation of Cu cations with (+2) oxidation state. In addition, the incorporation of Mg into the CuCrO2 lattice hinders the formation of perfect hexagonal‐shaped isolated grains and contribute to the preservation of fiber morphology after the final sintering step. Further, the optical transmittance in the visible range decreases with increasing Mg‐doping ratio. The corresponding optical band gaps are determined to be 3.53, 3.47, 3.30, and 3.22 eV, respectively, for x = 0, 0.01, 0.03, 0.05.

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“…Possibly because this paper was published just recently, no other reports on such a high conductivity for this system can be found. Besides the Mg-N doping, other co-doping strategies have also been studied, including Mg-Fe [133], Mg-S [137], and Ag-Mg [138], but the electrical and optical properties are not comparable to the study on Mg-N doping [124].…”

Section: Delafossitesmentioning

confidence: 99%

“…After the report of the high conductivity by that work, no following publications could be found for this system with a high conductivity. Many other dopants, including Fe, Ca, Ni, Sr, Ba, and Zn have since been incorporated into the CuCrO 2 , but their p-type conductivity is much lower than 220 S•cm −1 [122,[132][133][134][135]. Besides the substitution at the trivalent M sites, the N atom has been used as a substitute for the O atom in CuCrO 2 .…”

Section: Delafossitesmentioning

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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Characteristics of Fe- and Mg-doped CuCrO2 nanocrystals prepared by hydrothermal synthesis

Cited by 19 publications

References 46 publications

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

Production and Characterization of Magnesium‐Doped Copper Chromite Fibers

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

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