Structure and Magnetocaloric Properties of Two Cadmium Gadolinium Borates

Two cadmium–gadolinium-borates, CdGdB 5 O 10 and Cd 4 GdB 3 O 10, were synthesized as polycrystalline samples, and their single crystals were also grown. Monoclinic structures in space groups P 2 1 / n and Cm were identified for the two compounds, with magnetic properties characterized through M–T and M–H measurements. The maximum magnetic entropy change (−Δ S M max ) of CdGdB 5 O 10 reaches 23.94 J·kg –1 ·K –1 at 5 T and 3 K, approaching the value reported for commercial Gd 3 Ga 5 O 12 under identical conditions. Cd 4 GdB 3 O 10 exhibits a −Δ S M max of 13.96 J·kg –1 ·K –1 at 5 T and 2 K, comparable to Dy 3 Ga 5 O 12 . These two cadmium–gadolinium-borates may have potential for cryogenic magnetic cooling applications due to their high −Δ S M max, broad entropy plateau, and stable structure. Additionally, the optical and thermal properties of CdGdB 5 O 10 were investigated.