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The effect of Ge substitution for Ga atoms on the magnetic properties and MCE of the resulting Pr(Ga,Ge) compounds was systematically investigated by the combined magnetic measurements and neutron powder diffraction (NPD) experiments. Two magnetic transitions were identified for PrGa0.9Ge0.1 from ferromagnetic (FM) to FM at Tt = 26 K and from FM to paramagnetic (PM) at TC = 56 K. PrGa0.8Ge0.2 shows similar magnetic transitions with Tt = 55 K and TC = 75 K. Diffraction experiments confirmed that the distance between the nearest neighboring Pr atoms decreases with increasing Ge content, which would lead to an increased TC with Ge substitution. NPD experiments on PrGa0.9Ge0.1 supported the similar FM-to-FM transition as PrGa. Ge substitution exhibits a great influence on MCE regarding higher working temperatures, markedly extended work temperature span and comparable refrigerant capacity, hence, is beneficial for practical applications at liquid nitrogen temperatures.
Liu, H.
, Zheng, X.
, Wu, H.
, Xu, J.
, Gao, Y.
, Wang, D.
, Xu, J.
, Zhen, S.
, Gao, J.
, Pan, Y.
, Wang, G.
, Zhang, J.
, Huang, H.
, Wu, Y.
, Yin, W.
, Wang, S.
and Shen, B.
(2024),
Magnetic transitions and magnetocaloric effect of Pr(Ga,Ge) compounds, Scripta Materialia, [online], https://doi.org/10.1016/j.scriptamat.2024.116187, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=957689
(Accessed October 11, 2025)