Crystal growth and electrical properties of CuFeO2 single crystals

Dordor, P.; Chaminade, Jean‐Pierre; Wichainchai, Aree; Marquestaut, E.; Doumerc, Jean‐Pierre; Pouchard, Michel; Hagenmuller, Paul; Ammar, A.

doi:10.1016/0022-4596(88)90307-6

Cited by 76 publications

(35 citation statements)

References 9 publications

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“…Scientific interest in this class of compounds is due to the diversity of the physical properties exhibited by them. They show a wide range of conductivity from insulating to metallic [2][3][4]. Most of the Cu and Ag based delafossites are semiconductors whereas Pt and Pd based compounds exhibit good metallic conductivity; with their room temperature in-plane conductivity reaching about a few µΩ cm, which is comparable to that of metallic elemental copper [5].…”

Section: Introductionmentioning

confidence: 58%

“…Another feature common to all the delafossites investigated so far is the anisotropy in the compressibility of cell axes in the initial phase and the rapid increase in c/a ratio leading to structural phase transition. Surprisingly, in spite of having good quality synchrotron based XRD data, the structure of high pressure phase has only been reported for CuFeO 2 . Probably high quality single crystal X-ray diffraction data under high pressure may be helpful to get the structure of high pressure phase.…”

Section: Discussionmentioning

confidence: 99%

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Copper Delafossites under High Pressure—A Brief Review of XRD and Raman Spectroscopic Studies

Garg

Rao

2018

Crystals

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Delafossites, with a unique combination of electrical conductivity and optical transparency constitute an important class of materials with their wide range of applications in different fields. In this article, we review the high pressure studies on copper based semiconducting delafossites with special emphasis on their structural and vibrational properties by synchrotron based powder X-ray diffraction and Raman spectroscopic measurements. Though all the investigated compounds undergo pressure induced structural phase transition, the structure of high pressure phase has been reported only for CuFeO 2 . Based on X-ray diffraction data, one of the common features observed in all the studied compounds is the anisotropic compression of cell parameters in ambient rhombohedral structure. Ambient pressure bulk modulus obtained by fitting the pressure volume data lies between 135 to 200 GPa. Two allowed Raman mode frequencies E g and A 1g are observed in all the compounds in ambient phase with splitting of E g mode at the transition except for CuCrO 2 where along with splitting of E g mode, A 1g mode disappears and a strong mode appears which softens with pressure. Observed transition pressure scales exponentially with radii of trivalent cation being lowest for CuLaO 2 and highest for CuAlO 2 . The present review will help materials researchers to have an overview of the subject and reviewed results are relevant for fundamental science as well as possessing potential technological applications in synthesis of new materials with tailored physical properties.

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Section: Introductionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Copper Delafossites under High Pressure—A Brief Review of XRD and Raman Spectroscopic Studies

Garg

Rao

2018

Crystals

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“…In general, the difference (V fb -V on ) decreases with increasing the light intensity. Changing the pH of the solution in the range (7)(8)(9)(10)(11)(12)(13)(14) made no difference in the potential V on and the shiftless of V on with pH is attributed to the non adsorption of ions (e.g., H ? , OH -).…”

Section: Resultsmentioning

confidence: 98%

“…M 3? O 2 typified by the mineral delafossite CuFeO 2 [7], where M is commonly 3d-metal or a rare earth. The introduction of Cu: 3d-levels make the electronic bands independent of pH, thus minimizing the losses resulting from H 2 and O 2 over-voltages.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical characterization of the synthetic crednerite CuMnO2

et al. 2011

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High quality crednerite CuMnO 2 was prepared by solid state reaction at 950°C under argon flow. The oxide crystallizes in a monoclinically distorted delafossite structure associated to the static Jahn-Teller (J-T) effect of Mn 3? ion. Thermal analysis showed that it converts reversibly to spinel Cu x Mn 3-x O 4 at *420°C in air and further heating reform the crednerite above 940°C. CuMnO 2 is p-type, narrow semiconductor band gap with a direct optical gap of 1.31 eV. It exhibits a long-term chemical stability in basic medium (KOH 0.5 M), the semi logarithmic plot gave an exchange current density of 0.2 lA cm -2 and a corrosion potential of *-0.1 V SCE . The electrochemical oxygen insertion/desinsertion is evidenced from the intensity-potential characteristics. The flat band potential (V fb = -0.26 V SCE ) and the holes density (N A = 5.12 9 10 18 cm -3 ) were determined, respectively, by extrapolating the curve C -2 versus the potential to the intersection with C -2 = 0 and from the slope of the MottSchottky plot. From photoelectrochemical measurements, the valence band formed from Cu-3d wave function is positioned at 5.24 ± 0.02 eV below vacuum. The Nyquist representation shows straight line in the high frequency range with an angle of 65°ascribed to Warburg impedance originating from oxygen intercalation and compatible with a system under mass transfer control. The electrochemical junction is modeled by an equivalent electrical circuit thanks to the Randles model.

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“…CuFeO 2 has a delafossite structure consisting of closely packed oxygen double layers, in which the octahedral sites are occupied by Fe 3+ cations, and these double layers are linked by monovalent Cu + ions with two-fold oxygen linear coordination [18]. CuFeO 2 has been studied as a negative electrode material for LIBs [19 -20], and it exhibited a 475 mAh/g beyond 100 cycles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electrochemical Properties of CuFeO2 as Negative Electrodes for Sodium-Ion Batteries

Yui¹

2015

AJPC

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This paper investigates the electrochemical properties of CuFeO 2 prepared by using a malate precursor method as negative electrodes for sodium-ion batteries. In the voltage range of 0.01 to 3.0 V, the oxide calcined at 750°C shows a poor cycle property of 27 mAh/g at 10 cycles, although it exhibits the large first discharge capacity of 579 mAh/g. The cycle property is improved to up to 122 mAh/g at 10 cycles by employing a cycle condition with the voltage range of 0.01 to 1.5 V. The results suggest that the sodium-ion insertion/extraction mechanism in CuFeO 2 would involve valence changes of Fe ions in the oxide from the Fe 3+ state to Fe 0 state in the discharge process and from Fe 0 to Fe 3+ in the charge process.

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Crystal growth and electrical properties of CuFeO2 single crystals

Cited by 76 publications

References 9 publications

Copper Delafossites under High Pressure—A Brief Review of XRD and Raman Spectroscopic Studies

Copper Delafossites under High Pressure—A Brief Review of XRD and Raman Spectroscopic Studies

Photoelectrochemical characterization of the synthetic crednerite CuMnO2

Synthesis and Electrochemical Properties of CuFeO2 as Negative Electrodes for Sodium-Ion Batteries

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