Sr14.06Gd14.63(BO3)24: A Gadolinium-Rich Borate with Magnetic Refrigeration Performance

Yuwei Chen; Wang Liu; Dong Wang; Naizheng Wang; Feidi Fan; Jun Shen; Guochun Zhang; Huimin Song; Heng Tu

doi:10.1021/acs.inorgchem.3c01060

Sr_14.06Gd_14.63(BO₃)₂₄: A Gadolinium-Rich Borate with Magnetic Refrigeration Performance

Inorg Chem. 2023 Jul 3;62(26):10263-10268. doi: 10.1021/acs.inorgchem.3c01060. Epub 2023 Jun 20.

Authors

Yuwei Chen^{1

2}, Wang Liu^{1

2}, Dong Wang³, Naizheng Wang^{1

2}, Feidi Fan^{1

2}, Jun Shen⁴, Guochun Zhang^{1

2}, Huimin Song^{1

2}, Heng Tu^{1

2}

Affiliations

¹ Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
³ Center for High Pressure Science and Technology Advanced Research, Beijing 100094, P. R. China.
⁴ School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.

PMID: 37339514
DOI: 10.1021/acs.inorgchem.3c01060

Abstract

A single crystal of Sr_14.06Gd_14.63(BO₃)₂₄ has been successfully grown through a high-temperature solution technique with K₂O-KF-B₂O₃ as the flux. It crystallizes in the Pnma space group with parameters a = 22.3153(5) Å, b = 15.9087(4) Å, c = 8.7507(2) Å, and Z = 2. Sr_14.06Gd_14.63(BO₃)₂₄ has a three-dimensional (3D) framework built from [GdO] chains, in which the isolate [BO₃]^3- groups and Sr²⁺ ions fill in the space of the 3D framework. The magnetic measurements revealed that the title compound exhibits a large magnetocaloric effect with the magnetic entropy change of -ΔS_m = 42.2 J kg^-1 K^-1 at 2 K for 7 T, which is higher than that of the commercial material, Gd₃Ga₅O₁₂ (GGG), with -ΔS_m of 38.4 J kg^-1 K^-1 under the same conditions. Moreover, the infrared spectrum (IR), UV-vis-NIR diffuse reflectance spectrum, and thermal stability were investigated.