Effect of cobalt-doping on the magnetic properties and crystal structure of delafossite AgFeO2 nanoparticles

Takahiro Yamazaki; Shota Morimoto; Kuminori Hyodo; Tomoya Ishikawa; Yuko Ichiyanagi

doi:10.1016/j.jallcom.2018.02.261

Effect of cobalt-doping on the magnetic properties and crystal structure of delafossite AgFeO₂ nanoparticles

Takahiro Yamazaki
, Shota Morimoto
, Kuminori Hyodo
, Tomoya Ishikawa
, Yuko Ichiyanagi

Research Institute for Science and Technology

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Delafossite oxides are expected to be widely used in future applications, such as dilute magnetic semiconductors and multiferroic materials. AgFe_1-xCo_xO₂ (0 ≤ x ≤ 0.2) nanoparticles were synthesized by co-precipitation from silver nitrate, iron (III) nitrate, cobalt (II) nitrate, and sodium hydroxide. The resulting samples had approximately 10 nm diameter, determined by X-ray powder diffraction and TEM imaging. X-ray absorption fine structure and X-ray absorption near edge structure spectra of the samples indicated that the lattice constant axis decreased with increasing Co ion doping, and Fe and Co ions mainly occurred as trivalent Fe³⁺ and Co³⁺. Measurement of the magnetic properties by a SQUID magnetometer showed a gradual shift in the magnetic transition temperature (T_N1) from 14.4 to 11.2 K with increasing Co ion doping.

Original language	English
Pages (from-to)	631-636
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	745
DOIs	https://doi.org/10.1016/j.jallcom.2018.02.261
Publication status	Published - 15 May 2018

Keywords

Antiferromagnetism
Delafossite oxides
Multiferroic materials
Nanoparticles

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10.1016/j.jallcom.2018.02.261

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title = "Effect of cobalt-doping on the magnetic properties and crystal structure of delafossite AgFeO2 nanoparticles",

abstract = "Delafossite oxides are expected to be widely used in future applications, such as dilute magnetic semiconductors and multiferroic materials. AgFe1-xCoxO2 (0 ≤ x ≤ 0.2) nanoparticles were synthesized by co-precipitation from silver nitrate, iron (III) nitrate, cobalt (II) nitrate, and sodium hydroxide. The resulting samples had approximately 10 nm diameter, determined by X-ray powder diffraction and TEM imaging. X-ray absorption fine structure and X-ray absorption near edge structure spectra of the samples indicated that the lattice constant axis decreased with increasing Co ion doping, and Fe and Co ions mainly occurred as trivalent Fe3+ and Co3+. Measurement of the magnetic properties by a SQUID magnetometer showed a gradual shift in the magnetic transition temperature (TN1) from 14.4 to 11.2 K with increasing Co ion doping.",

keywords = "Antiferromagnetism, Delafossite oxides, Multiferroic materials, Nanoparticles",

author = "Takahiro Yamazaki and Shota Morimoto and Kuminori Hyodo and Tomoya Ishikawa and Yuko Ichiyanagi",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = may,

day = "15",

doi = "10.1016/j.jallcom.2018.02.261",

language = "English",

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journal = "Journal of Alloys and Compounds",

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publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Effect of cobalt-doping on the magnetic properties and crystal structure of delafossite AgFeO2 nanoparticles

AU - Yamazaki, Takahiro

AU - Morimoto, Shota

AU - Hyodo, Kuminori

AU - Ishikawa, Tomoya

AU - Ichiyanagi, Yuko

PY - 2018/5/15

Y1 - 2018/5/15

N2 - Delafossite oxides are expected to be widely used in future applications, such as dilute magnetic semiconductors and multiferroic materials. AgFe1-xCoxO2 (0 ≤ x ≤ 0.2) nanoparticles were synthesized by co-precipitation from silver nitrate, iron (III) nitrate, cobalt (II) nitrate, and sodium hydroxide. The resulting samples had approximately 10 nm diameter, determined by X-ray powder diffraction and TEM imaging. X-ray absorption fine structure and X-ray absorption near edge structure spectra of the samples indicated that the lattice constant axis decreased with increasing Co ion doping, and Fe and Co ions mainly occurred as trivalent Fe3+ and Co3+. Measurement of the magnetic properties by a SQUID magnetometer showed a gradual shift in the magnetic transition temperature (TN1) from 14.4 to 11.2 K with increasing Co ion doping.

AB - Delafossite oxides are expected to be widely used in future applications, such as dilute magnetic semiconductors and multiferroic materials. AgFe1-xCoxO2 (0 ≤ x ≤ 0.2) nanoparticles were synthesized by co-precipitation from silver nitrate, iron (III) nitrate, cobalt (II) nitrate, and sodium hydroxide. The resulting samples had approximately 10 nm diameter, determined by X-ray powder diffraction and TEM imaging. X-ray absorption fine structure and X-ray absorption near edge structure spectra of the samples indicated that the lattice constant axis decreased with increasing Co ion doping, and Fe and Co ions mainly occurred as trivalent Fe3+ and Co3+. Measurement of the magnetic properties by a SQUID magnetometer showed a gradual shift in the magnetic transition temperature (TN1) from 14.4 to 11.2 K with increasing Co ion doping.

KW - Antiferromagnetism

KW - Delafossite oxides

KW - Multiferroic materials

KW - Nanoparticles

UR - https://www.scopus.com/pages/publications/85042517574

U2 - 10.1016/j.jallcom.2018.02.261

DO - 10.1016/j.jallcom.2018.02.261

M3 - Article

AN - SCOPUS:85042517574

SN - 0925-8388

VL - 745

SP - 631

EP - 636

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Effect of cobalt-doping on the magnetic properties and crystal structure of delafossite AgFeO₂ nanoparticles

Abstract

Keywords

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