Magnetocaloric properties of K2Mn(SO4)2·4H2O and NH4Cr(SO4)2·12H2O crystals

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

doi:10.1016/j.cryogenics.2026.104311

Magnetocaloric properties of K₂Mn(SO₄)₂·4H₂O and NH₄Cr(SO₄)₂·12H₂O crystals

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

^*Corresponding author for this work

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

Abstract

Two hydrated sulfate crystals, K₂Mn(SO₄)₂·4H₂O and NH₄Cr(SO₄)₂·12H₂O, were grown from the aqueous solution by the spontaneous nucleation and the slow cooling method. Their magnetic and magnetocaloric properties were systematically investigated by measuring magnetic susceptibility ( χ ) and magnetization ( M ), and thermal behaviors were also surveyed by the thermogravimetric analysis (TG)-differential scanning calorimetric (DSC) measurements. At 2 K and μ₀ΔH = 7 T, the maximum magnetic entropy changes (−Δ S_M ) reach 36.22 J·kg⁻¹·K⁻¹ for K₂Mn(SO₄)₂·4H₂O and 22.37 J·kg⁻¹·K⁻¹ for NH₄Cr(SO₄)₂·12H₂O, respectively. Moreover, under the magnetic field changes of 7 T, the relative cooling capacity (RCP) and refrigeration capacity (RC) values reach 219.1 J·kg⁻¹ and 160.8J·kg⁻¹ for K₂Mn(SO₄)₂·4H₂O, 101.6 and 76.9J·kg⁻¹ for NH₄Cr(SO₄)₂·12H₂O. The results indicate that the hydrated sulfate crystals have potential significant applications as refrigerants in the field of low-temperature magnetic refrigeration.

Original language	English
Article number	104311
Journal	Cryogenics
Volume	156
DOIs	https://doi.org/10.1016/j.cryogenics.2026.104311
Publication status	Published - Apr 2026
Externally published	Yes

Keywords

Cr-basedcompound
Crystal growth
Magnetocaloriceffect
Mn-basedcompound

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10.1016/j.cryogenics.2026.104311

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@article{fab0928df904425788bda85a299a8693,

title = "Magnetocaloric properties of K2Mn(SO4)2·4H2O and NH4Cr(SO4)2·12H2O crystals",

abstract = "Two hydrated sulfate crystals, K2Mn(SO4)2·4H2O and NH4Cr(SO4)2·12H2O, were grown from the aqueous solution by the spontaneous nucleation and the slow cooling method. Their magnetic and magnetocaloric properties were systematically investigated by measuring magnetic susceptibility ( χ ) and magnetization ( M ), and thermal behaviors were also surveyed by the thermogravimetric analysis (TG)-differential scanning calorimetric (DSC) measurements. At 2 K and μ0ΔH = 7 T, the maximum magnetic entropy changes (−Δ SM ) reach 36.22 J·kg⁻1·K⁻1 for K2Mn(SO4)2·4H2O and 22.37 J·kg⁻1·K⁻1 for NH4Cr(SO4)2·12H2O, respectively. Moreover, under the magnetic field changes of 7 T, the relative cooling capacity (RCP) and refrigeration capacity (RC) values reach 219.1 J·kg⁻1 and 160.8J·kg⁻1 for K2Mn(SO4)2·4H2O, 101.6 and 76.9J·kg⁻1 for NH4Cr(SO4)2·12H2O. The results indicate that the hydrated sulfate crystals have potential significant applications as refrigerants in the field of low-temperature magnetic refrigeration.",

keywords = "Cr-basedcompound, Crystal growth, Magnetocaloriceffect, Mn-basedcompound",

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

note = "Publisher Copyright: {\textcopyright} 2026 Elsevier Ltd.",

year = "2026",

month = apr,

doi = "10.1016/j.cryogenics.2026.104311",

language = "English",

volume = "156",

journal = "Cryogenics",

issn = "0011-2275",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Magnetocaloric properties of K2Mn(SO4)2·4H2O and NH4Cr(SO4)2·12H2O crystals

AU - Wang, Yunhui

AU - Wan, Tingwei

AU - Zhao, Yanan

AU - Chen, Zuhua

AU - Li, Zhenxing

AU - Tu, Heng

AU - Shen, Jun

AU - Zhang, Guochun

PY - 2026/4

Y1 - 2026/4

N2 - Two hydrated sulfate crystals, K2Mn(SO4)2·4H2O and NH4Cr(SO4)2·12H2O, were grown from the aqueous solution by the spontaneous nucleation and the slow cooling method. Their magnetic and magnetocaloric properties were systematically investigated by measuring magnetic susceptibility ( χ ) and magnetization ( M ), and thermal behaviors were also surveyed by the thermogravimetric analysis (TG)-differential scanning calorimetric (DSC) measurements. At 2 K and μ0ΔH = 7 T, the maximum magnetic entropy changes (−Δ SM ) reach 36.22 J·kg⁻1·K⁻1 for K2Mn(SO4)2·4H2O and 22.37 J·kg⁻1·K⁻1 for NH4Cr(SO4)2·12H2O, respectively. Moreover, under the magnetic field changes of 7 T, the relative cooling capacity (RCP) and refrigeration capacity (RC) values reach 219.1 J·kg⁻1 and 160.8J·kg⁻1 for K2Mn(SO4)2·4H2O, 101.6 and 76.9J·kg⁻1 for NH4Cr(SO4)2·12H2O. The results indicate that the hydrated sulfate crystals have potential significant applications as refrigerants in the field of low-temperature magnetic refrigeration.

AB - Two hydrated sulfate crystals, K2Mn(SO4)2·4H2O and NH4Cr(SO4)2·12H2O, were grown from the aqueous solution by the spontaneous nucleation and the slow cooling method. Their magnetic and magnetocaloric properties were systematically investigated by measuring magnetic susceptibility ( χ ) and magnetization ( M ), and thermal behaviors were also surveyed by the thermogravimetric analysis (TG)-differential scanning calorimetric (DSC) measurements. At 2 K and μ0ΔH = 7 T, the maximum magnetic entropy changes (−Δ SM ) reach 36.22 J·kg⁻1·K⁻1 for K2Mn(SO4)2·4H2O and 22.37 J·kg⁻1·K⁻1 for NH4Cr(SO4)2·12H2O, respectively. Moreover, under the magnetic field changes of 7 T, the relative cooling capacity (RCP) and refrigeration capacity (RC) values reach 219.1 J·kg⁻1 and 160.8J·kg⁻1 for K2Mn(SO4)2·4H2O, 101.6 and 76.9J·kg⁻1 for NH4Cr(SO4)2·12H2O. The results indicate that the hydrated sulfate crystals have potential significant applications as refrigerants in the field of low-temperature magnetic refrigeration.

KW - Cr-basedcompound

KW - Crystal growth

KW - Magnetocaloriceffect

KW - Mn-basedcompound

UR - https://www.scopus.com/pages/publications/105030110899

U2 - 10.1016/j.cryogenics.2026.104311

DO - 10.1016/j.cryogenics.2026.104311

M3 - Article

AN - SCOPUS:105030110899

SN - 0011-2275

VL - 156

JO - Cryogenics

JF - Cryogenics

M1 - 104311

ER -

Magnetocaloric properties of K₂Mn(SO₄)₂·4H₂O and NH₄Cr(SO₄)₂·12H₂O crystals

Abstract

Keywords

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