Gadolinium-Rich Borate Gd17.33(BO3)4(B2O5)2O16 Exhibiting a Magnetocaloric Effect

Huimin Song; Naizheng Wang; Wang Liu; Jingcheng Feng; Jun Shen; Wei Dai; Zheshuai Lin; Jiyong Yao; Guochun Zhang

doi:10.1021/acs.inorgchem.0c01547

Gadolinium-Rich Borate Gd_17.33(BO₃)₄(B₂O₅)₂O₁₆ Exhibiting a Magnetocaloric Effect

Inorg Chem. 2020 Aug 3;59(15):11071-11078. doi: 10.1021/acs.inorgchem.0c01547. Epub 2020 Jul 10.

Authors

Huimin Song^{1

2}, Naizheng Wang^{1

2}, Wang Liu^{1

2}, Jingcheng Feng^{1

2}, Jun Shen³, Wei Dai³, Zheshuai Lin^{1

2}, Jiyong Yao^{1

2}, Guochun Zhang^{1

2

4}

Affiliations

¹ Beijing 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 Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
⁴ State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China.

PMID: 32648764
DOI: 10.1021/acs.inorgchem.0c01547

Abstract

A gadolinium-rich borate Gd_17.33(BO₃)₄(B₂O₅)₂O₁₆ was successfully grown by the high-temperature solution method using the Rb₂O-B₂O₃ flux. The crystal crystallizes in centrosymmetric space group C2/m with lattice constants a = 18.4300(2) Å, b = 3.7400(4) Å, c = 14.2047(16) Å, and β = 119.8550(12)°. Two different honeycomb-like [GdO] layers alternately arrange in the order ABAB forming the three-dimensional framework, in which the isolated [B₂O₅] and [BO₃] units fill in channels of the 12-membered and 10-membered [GdO] polyhedral rings, respectively. The UV cutoff edge of Gd_17.33(BO₃)₄(B₂O₅)₂O₁₆ is less than 240 nm. The maximum -ΔS_m,max is 26.53 J kg^-1 K^-1 or 174.70 mJ cm^-3 K^-1 (T = 4.4 K and ΔH = 7 T) as investigated by the isothermal magnetization method.