Effect of Co doping at the Ho– and Fe–sites on the structural, optical and magnetic properties of HoFeO3 nanoparticles synthesized by co–precipitation method

Nguyen Anh Tien; Tran Thi Thanh Uyen; Valentina Olegovna Mittova; Elena Viktorovna Tomina; Tran Thi To Nga; Truong Chi Hien; Vu Anh Thi Ngoc

doi:10.1016/j.inoche.2025.114195

Effect of Co doping at the Ho– and Fe–sites on the structural, optical and magnetic properties of HoFeO₃ nanoparticles synthesized by co–precipitation method

Nguyen Anh Tien
, Tran Thi Thanh Uyen
, Valentina Olegovna Mittova
, Elena Viktorovna Tomina
, Tran Thi To Nga
, Truong Chi Hien
, Vu Anh Thi Ngoc

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

4 Scopus citations

Abstract

This study investigates the effects of Co doping at the Ho– and Fe–sites in HoFeO₃ (HoFeO₃, Ho_0.9Co_0.1FeO₃, and HoFe_0.9Co_0.1O₃) on the elemental, structural, thermal, optical, and magnetic properties of nanosized perovskite–like HoFeO₃. Thermogravimetric analysis (TGA) revealed that Co doping at the Ho–site resulted in a greater reduction in mass upon calcination compared to doping at the Fe–site. Co doping at the Ho–site led to oxygen deficiency, while the sample with Co doping at the Fe–site and the undoped HoFeO₃ sample exhibited an oxygen redundant in the perovskite structure. Additionally, Co doping at the Ho–site reduced the average crystallite size and unit cell volume compared to the other samples. The Ho_0.9Co_0.1FeO₃ sample exhibited increased visible light absorption, with a narrower band gap (E_g = 1.94 eV) than that of the undoped HoFeO₃ (E_g = 2.13 eV) and HoFe_0.9Co_0.1O₃ (E_g = 1.98 eV) samples. Both the Co–doped samples showed hard ferromagnetism. Specifically, the coercivity (H_c = 1042.13 Oe) and remanence (M_r = 1.34·10⁰ emu·g⁻¹) of the Ho_0.9Co_0.1FeO₃ sample were 8 and 46 times higher, respectively, than those of the HoFe_0.9Co_0.1O₃ sample (H_c = 130.02 Oe, M_r = 2.92·10⁻² emu·g⁻¹).

Original language	English
Article number	114195
Journal	Inorganic Chemistry Communications
Volume	176
DOIs	https://doi.org/10.1016/j.inoche.2025.114195
State	Published - 1 Jun 2025
Externally published	Yes

Keywords

Co-precipitation method
HoCoFeO
HoFeCoO
Magnetic properties
Nanoparticles
Optical properties
Structure

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1016/j.inoche.2025.114195

Cite this

Tien, N. A., Thanh Uyen, T. T., Mittova, V. O., Tomina, E. V., To Nga, T. T., Hien, T. C., & Anh Thi Ngoc, V. (2025). Effect of Co doping at the Ho– and Fe–sites on the structural, optical and magnetic properties of HoFeO₃ nanoparticles synthesized by co–precipitation method. Inorganic Chemistry Communications, 176, Article 114195. https://doi.org/10.1016/j.inoche.2025.114195

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title = "Effect of Co doping at the Ho– and Fe–sites on the structural, optical and magnetic properties of HoFeO3 nanoparticles synthesized by co–precipitation method",

abstract = "This study investigates the effects of Co doping at the Ho– and Fe–sites in HoFeO3 (HoFeO3, Ho0.9Co0.1FeO3, and HoFe0.9Co0.1O3) on the elemental, structural, thermal, optical, and magnetic properties of nanosized perovskite–like HoFeO3. Thermogravimetric analysis (TGA) revealed that Co doping at the Ho–site resulted in a greater reduction in mass upon calcination compared to doping at the Fe–site. Co doping at the Ho–site led to oxygen deficiency, while the sample with Co doping at the Fe–site and the undoped HoFeO3 sample exhibited an oxygen redundant in the perovskite structure. Additionally, Co doping at the Ho–site reduced the average crystallite size and unit cell volume compared to the other samples. The Ho0.9Co0.1FeO3 sample exhibited increased visible light absorption, with a narrower band gap (Eg = 1.94 eV) than that of the undoped HoFeO3 (Eg = 2.13 eV) and HoFe0.9Co0.1O3 (Eg = 1.98 eV) samples. Both the Co–doped samples showed hard ferromagnetism. Specifically, the coercivity (Hc = 1042.13 Oe) and remanence (Mr = 1.34·100 emu·g−1) of the Ho0.9Co0.1FeO3 sample were 8 and 46 times higher, respectively, than those of the HoFe0.9Co0.1O3 sample (Hc = 130.02 Oe, Mr = 2.92·10−2 emu·g−1).",

keywords = "Co-precipitation method, HoCoFeO, HoFeCoO, Magnetic properties, Nanoparticles, Optical properties, Structure",

author = "Tien, \{Nguyen Anh\} and \{Thanh Uyen\}, \{Tran Thi\} and Mittova, \{Valentina Olegovna\} and Tomina, \{Elena Viktorovna\} and \{To Nga\}, \{Tran Thi\} and Hien, \{Truong Chi\} and \{Anh Thi Ngoc\}, Vu",

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year = "2025",

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doi = "10.1016/j.inoche.2025.114195",

language = "English",

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Effect of Co doping at the Ho– and Fe–sites on the structural, optical and magnetic properties of HoFeO₃ nanoparticles synthesized by co–precipitation method. / Tien, Nguyen Anh; Thanh Uyen, Tran Thi; Mittova, Valentina Olegovna et al.
In: Inorganic Chemistry Communications, Vol. 176, 114195, 01.06.2025.

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

TY - JOUR

T1 - Effect of Co doping at the Ho– and Fe–sites on the structural, optical and magnetic properties of HoFeO3 nanoparticles synthesized by co–precipitation method

AU - Tien, Nguyen Anh

AU - Thanh Uyen, Tran Thi

AU - Mittova, Valentina Olegovna

AU - Tomina, Elena Viktorovna

AU - To Nga, Tran Thi

AU - Hien, Truong Chi

AU - Anh Thi Ngoc, Vu

PY - 2025/6/1

Y1 - 2025/6/1

N2 - This study investigates the effects of Co doping at the Ho– and Fe–sites in HoFeO3 (HoFeO3, Ho0.9Co0.1FeO3, and HoFe0.9Co0.1O3) on the elemental, structural, thermal, optical, and magnetic properties of nanosized perovskite–like HoFeO3. Thermogravimetric analysis (TGA) revealed that Co doping at the Ho–site resulted in a greater reduction in mass upon calcination compared to doping at the Fe–site. Co doping at the Ho–site led to oxygen deficiency, while the sample with Co doping at the Fe–site and the undoped HoFeO3 sample exhibited an oxygen redundant in the perovskite structure. Additionally, Co doping at the Ho–site reduced the average crystallite size and unit cell volume compared to the other samples. The Ho0.9Co0.1FeO3 sample exhibited increased visible light absorption, with a narrower band gap (Eg = 1.94 eV) than that of the undoped HoFeO3 (Eg = 2.13 eV) and HoFe0.9Co0.1O3 (Eg = 1.98 eV) samples. Both the Co–doped samples showed hard ferromagnetism. Specifically, the coercivity (Hc = 1042.13 Oe) and remanence (Mr = 1.34·100 emu·g−1) of the Ho0.9Co0.1FeO3 sample were 8 and 46 times higher, respectively, than those of the HoFe0.9Co0.1O3 sample (Hc = 130.02 Oe, Mr = 2.92·10−2 emu·g−1).

AB - This study investigates the effects of Co doping at the Ho– and Fe–sites in HoFeO3 (HoFeO3, Ho0.9Co0.1FeO3, and HoFe0.9Co0.1O3) on the elemental, structural, thermal, optical, and magnetic properties of nanosized perovskite–like HoFeO3. Thermogravimetric analysis (TGA) revealed that Co doping at the Ho–site resulted in a greater reduction in mass upon calcination compared to doping at the Fe–site. Co doping at the Ho–site led to oxygen deficiency, while the sample with Co doping at the Fe–site and the undoped HoFeO3 sample exhibited an oxygen redundant in the perovskite structure. Additionally, Co doping at the Ho–site reduced the average crystallite size and unit cell volume compared to the other samples. The Ho0.9Co0.1FeO3 sample exhibited increased visible light absorption, with a narrower band gap (Eg = 1.94 eV) than that of the undoped HoFeO3 (Eg = 2.13 eV) and HoFe0.9Co0.1O3 (Eg = 1.98 eV) samples. Both the Co–doped samples showed hard ferromagnetism. Specifically, the coercivity (Hc = 1042.13 Oe) and remanence (Mr = 1.34·100 emu·g−1) of the Ho0.9Co0.1FeO3 sample were 8 and 46 times higher, respectively, than those of the HoFe0.9Co0.1O3 sample (Hc = 130.02 Oe, Mr = 2.92·10−2 emu·g−1).

KW - Co-precipitation method

KW - HoCoFeO

KW - HoFeCoO

KW - Magnetic properties

KW - Nanoparticles

KW - Optical properties

KW - Structure

UR - https://www.scopus.com/pages/publications/85219340296

U2 - 10.1016/j.inoche.2025.114195

DO - 10.1016/j.inoche.2025.114195

M3 - Article

AN - SCOPUS:85219340296

SN - 1387-7003

VL - 176

JO - Inorganic Chemistry Communications

JF - Inorganic Chemistry Communications

M1 - 114195

ER -