Cryogenic magnetic properties and magnetocaloric responses in Gd11GeP3O26 oxide

Abstract

In this work, we prepared the single-phased Gd₁₁GeP₃O₂₆ oxide by solid-phase reaction method and experimentally characterized its structure, magnetic and MC properties. The Gd₁₁GeP₃O₂₆ oxide is found to be crystallized in triclinic structure (P1 space group) and its constituting elements show excellent homogeneity and with the valence state of Gd³⁺, Ge⁴⁺, P⁵⁺ and O²⁻, respectively. The Gd₁₁GeP₃O₂₆ oxide orders magnetically around 2.78 K and possesses remarkable cryogenic MC responses. The maximum magnetic entropy changes/temperature-averaged magnetic entropy change (5 K-lift) and relative cooling powers in Gd₁₁GeP₃O₂₆ oxide are 32/29.4 J/kgK and 404.4 J/kg under magnetic field variation 0–7 T, respectively. These MC parameters are comparable to most acquired RE-based magnetic oxides suitable for cryogenic application, making present Gd₁₁GeP₃O₂₆ oxide of interest for magnetic cooling application.