Growth and Magnetocaloric Properties of Co(NH4)2(SO4)2·6H2O Crystal

Yunhui Wang; Tingwei Wan; Yuwei Chen; Zuhua Chen; Zhenxing Li; Yanan Zhao; Jun Shen; Guochun Zhang; Heng Tu

doi:10.3390/cryst15121022

Growth and Magnetocaloric Properties of Co(NH₄)₂(SO₄)₂·6H₂O Crystal

Yunhui Wang
, Tingwei Wan
, Yuwei Chen
, Zuhua Chen
, Zhenxing Li
, Yanan Zhao
, Jun Shen
, Guochun Zhang
, Heng Tu^*

^*Corresponding author for this work

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

Abstract

Co(NH₄)₂(SO₄)₂·6H₂O single crystal was grown via slow solvent evaporation at room temperature. The magnetic and magnetocaloric properties were investigated. The results show that Co(NH₄)₂(SO₄)₂·6H₂O exhibits paramagnetic behavior across 2–300 K. The maximum magnetic entropy change (−ΔS_M) of 13.90 J kg⁻¹ K⁻¹ under conditions of 2 K and μ₀ΔH = 5 T approaches the theoretical value of 14.58 J kg⁻¹ K⁻¹. In addition, the variation of −ΔS_M with temperature is relatively flat, suggesting a wide working temperature range for magnetic refrigeration, which provides the possibility for the application of Co²⁺-based compounds in the field of low-temperature magnetic refrigeration.

Original language	English
Article number	1022
Journal	Crystals
Volume	15
Issue number	12
DOIs	https://doi.org/10.3390/cryst15121022
Publication status	Published - Dec 2025
Externally published	Yes

Keywords

Co-based compound
crystal growth
magnetocaloric effect
slow evaporation method

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10.3390/cryst15121022

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title = "Growth and Magnetocaloric Properties of Co(NH4)2(SO4)2·6H2O Crystal",

abstract = "Co(NH4)2(SO4)2·6H2O single crystal was grown via slow solvent evaporation at room temperature. The magnetic and magnetocaloric properties were investigated. The results show that Co(NH4)2(SO4)2·6H2O exhibits paramagnetic behavior across 2–300 K. The maximum magnetic entropy change (−ΔSM) of 13.90 J kg−1 K−1 under conditions of 2 K and μ0ΔH = 5 T approaches the theoretical value of 14.58 J kg−1 K−1. In addition, the variation of −ΔSM with temperature is relatively flat, suggesting a wide working temperature range for magnetic refrigeration, which provides the possibility for the application of Co2+-based compounds in the field of low-temperature magnetic refrigeration.",

keywords = "Co-based compound, crystal growth, magnetocaloric effect, slow evaporation method",

author = "Yunhui Wang and Tingwei Wan and Yuwei Chen and Zuhua Chen and Zhenxing Li and Yanan Zhao and Jun Shen and Guochun Zhang and Heng Tu",

note = "Publisher Copyright: {\textcopyright} 2025 by the authors.",

year = "2025",

month = dec,

doi = "10.3390/cryst15121022",

language = "English",

volume = "15",

journal = "Crystals",

issn = "2073-4352",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

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}

TY - JOUR

T1 - Growth and Magnetocaloric Properties of Co(NH4)2(SO4)2·6H2O Crystal

AU - Wang, Yunhui

AU - Wan, Tingwei

AU - Chen, Yuwei

AU - Chen, Zuhua

AU - Li, Zhenxing

AU - Zhao, Yanan

AU - Shen, Jun

AU - Zhang, Guochun

AU - Tu, Heng

PY - 2025/12

Y1 - 2025/12

N2 - Co(NH4)2(SO4)2·6H2O single crystal was grown via slow solvent evaporation at room temperature. The magnetic and magnetocaloric properties were investigated. The results show that Co(NH4)2(SO4)2·6H2O exhibits paramagnetic behavior across 2–300 K. The maximum magnetic entropy change (−ΔSM) of 13.90 J kg−1 K−1 under conditions of 2 K and μ0ΔH = 5 T approaches the theoretical value of 14.58 J kg−1 K−1. In addition, the variation of −ΔSM with temperature is relatively flat, suggesting a wide working temperature range for magnetic refrigeration, which provides the possibility for the application of Co2+-based compounds in the field of low-temperature magnetic refrigeration.

AB - Co(NH4)2(SO4)2·6H2O single crystal was grown via slow solvent evaporation at room temperature. The magnetic and magnetocaloric properties were investigated. The results show that Co(NH4)2(SO4)2·6H2O exhibits paramagnetic behavior across 2–300 K. The maximum magnetic entropy change (−ΔSM) of 13.90 J kg−1 K−1 under conditions of 2 K and μ0ΔH = 5 T approaches the theoretical value of 14.58 J kg−1 K−1. In addition, the variation of −ΔSM with temperature is relatively flat, suggesting a wide working temperature range for magnetic refrigeration, which provides the possibility for the application of Co2+-based compounds in the field of low-temperature magnetic refrigeration.

KW - Co-based compound

KW - crystal growth

KW - magnetocaloric effect

KW - slow evaporation method

UR - https://www.scopus.com/pages/publications/105025776069

U2 - 10.3390/cryst15121022

DO - 10.3390/cryst15121022

M3 - Article

AN - SCOPUS:105025776069

SN - 2073-4352

VL - 15

JO - Crystals

JF - Crystals

IS - 12

M1 - 1022

ER -

Growth and Magnetocaloric Properties of Co(NH₄)₂(SO₄)₂·6H₂O Crystal

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Keywords

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