Crystal chemistry and electrical properties of the delafossite structure

Marquardt, Meagen A.; Ashmore, Nathan; Cann, David P.

doi:10.1016/j.tsf.2005.08.316

Cited by 351 publications

(232 citation statements)

References 81 publications

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“…The most studied family is AMO 2 oxides, where the monovalent A-site cations (Ag + , Cu + , Pd + , or Pt + ) adopt linear coordination, while the M-site cation (transition metal, Al, Ga, etc) is octahedrally coordinated by oxygen and forms a triangular lattice [1]. Geometrical frustration triggered by the triangular network in presence of antiferromagnetic interactions leads to many fascinating phenomena discovered in the delafossite compounds.…”

Section: Introductionmentioning

confidence: 99%

Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag₃Co₂SbO₆

et al. 2016

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We report the revised crystal structure, static and dynamic magnetic properties of quasi-two dimensional honeycomb-lattice silver delafossite Ag 3 Co 2 SbO 6 . The magnetic susceptibility and specific heat data are consistent with the onset of antiferromagnetic long range order at low temperatures with Néel temperature T N ~ 21.2 K. In addition, the magnetization curves revealed a field-induced (spin-flop type) transition below T N in moderate magnetic fields. The GGA+U calculations show the importance of the orbital degrees of freedom, which maintain a hierarchy of exchange interaction in the system. The strongest antiferromagnetic exchange coupling was found in the shortest Co-Co pairs and is due to direct and superexchange interactions between the half-filled xz+yz orbitals pointing directly to each other. The other four out of six nearest neighbor exchanges within the cobalt hexagon are suppressed, since for these bonds active half-filled orbitals turned out to be parallel and do not overlap. The electron spin resonance (ESR) spectra reveal a Gaussian shape line attributed to Co 2+ ion in octahedral coordination with average effective g-factor g=2.3±0.1 at room temperature and shows strong divergence of ESR parameters below ~ 120 K, which imply an extended region of short-range correlations. Based on the results of magnetic and thermodynamic studies in applied fields, we propose the magnetic phase diagram for the new honeycomb-lattice delafossite.

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Section: Introductionmentioning

confidence: 99%

Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag₃Co₂SbO₆

et al. 2016

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“…The raw materials used were commercially available, analytical grade Cu(CH 3 COO) 2 2 ·H 2 O was added and stirred until completely resolved similarly at room temperature. After subsequent stirring for 24 h at room temperature, the resultant solution prepared was used as the starting sol solution.…”

Section: Methodsmentioning

confidence: 99%

Preparation and properties of Sol–Gel derived CuFeO<sub>2</sub> thin films by dip-coating technique

Nasu

Hasegawa

Hashimoto

et al. 2015

J. Ceram. Soc. Japan

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CuFeO 2 crystal thin films were successfully prepared by dip-coating technique through solgel route on silica glass substrates. Heat treatment under nitrogen atmosphere was necessary to obtain monovalent Cu and 800900°C firing was indispensable to prepare CuFeO 2 stable phase, and 29 h heat-treatment was appropriate to lower the electrical resistivity. For the dip-coated films, CuO impurity phase was observed in Cu:Fe = 1:1 solution from X-ray diffraction pattern (XRD), and thus the Cu containing solution of Cu:Fe = 0.99:1, 0.97:1, 0.95:1, 0.9:1and 0.8:1 were prepared to eliminate excess CuO phase. Too lower content of Cu such as 0.9:1 and 0.8:1 provided Fe oxides as impurity phase, but slight decrease of Cu iecreased the electric resistivity although CuO was still slightly observed by XRD. The visible transparency of the films was nearly 10%, and some films of conduction type was confirmed as p-type by measuring Hall effect.

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“…Silver ferrite, AgFeO 2 , has a layered structure with one layer as the close-packed monovalent Ag ions and the other as edge-shared Fe 3+ O 6 octahedra with iron cations inside [11]. The Ag + cations are coordinated by two oxygen ions with the linear O-Ag-O bonds.…”

Section: Introductionmentioning

confidence: 99%

“…Each Fe 3+ cation, located in the slightly distorted oxygen octahedron, is coordinated with six oxygen ions. The delafossite structure can form two polytypes depending on the sequence of stacking of layers [10,11]. These are rhombohedral 3R type (space group symmetry R-3m) and hexago-nal 2H type (space group symmetry P6 3 /mmc) as presented in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Among methods of producing silver delafossite materials, it may be distinguished as: (1) low-temperature methods (e.g., hydrothermal synthesis, metathetical reaction, oxidizing fl ux reaction, sol-gel) [10][11][12][13][14], (2) high-temperature synthesis (e.g., solid-state reaction [15][16][17][18][19]) and (3) thin fi lm techniques (e.g., atomic layer deposition, pulsed laser deposition (PLD), chemical vapour deposition (CVD), RF sputtering [6,[20][21][22]). However, they do not always allow obtaining compounds of high purity.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of AgFeO₂ delafossite with non-stoichiometric silver concentration

et al. 2017

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Abstract. The simple co-precipitation method was used to prepare Ag x FeO 2 delafossite with non-stoichiometric silver concentration in the range of x = 0.05-1. The obtained material was investigated using X-ray powder diffraction and 57Fe Mössbauer spectroscopy at room temperature. The structural and hyperfi ne interaction parameters were recognized in relation with decreasing silver concentration. The study revealed that the delafossite structure of Ag x FeO 2 was maintained up to x = 0.9; as the range of silver concentration was decreased to 0.05  x  0.8, a mixture of AgFeO 2 , Fe 2 O 3 or/and FeOOH was formed.

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Crystal chemistry and electrical properties of the delafossite structure

Cited by 351 publications

References 81 publications

Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag₃Co₂SbO₆

Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag₃Co₂SbO₆

Preparation and properties of Sol–Gel derived CuFeO<sub>2</sub> thin films by dip-coating technique

Synthesis and characterization of AgFeO₂ delafossite with non-stoichiometric silver concentration

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Crystal chemistry and electrical properties of the delafossite structure

Cited by 351 publications

References 81 publications

Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6

Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6

Preparation and properties of Sol&ndash;Gel derived CuFeO<sub>2</sub> thin films by dip-coating technique

Synthesis and characterization of AgFeO2 delafossite with non-stoichiometric silver concentration

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Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag₃Co₂SbO₆

Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag₃Co₂SbO₆

Preparation and properties of Sol–Gel derived CuFeO<sub>2</sub> thin films by dip-coating technique

Synthesis and characterization of AgFeO₂ delafossite with non-stoichiometric silver concentration