2014/01/08 by A. C. Sackville Hamilton, Arran Hamilton, G. I. Lampronti +4 · 3 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Analytical Chemistry (journal) #Antiferromagnetism #Ceramic #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Diffraction #Ion #Isothermal process #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic refrigeration #Magnetic susceptibility #Magnetization #Materials science #Metallurgy #Multiferroics and related materials #Optics #Physics #Thermodynamics #cond-mat.mtrl-sci
paper · pdf · doi:10.1088/0953-8984/26/11/116001
published as J. Phys.: Condens. Matter 26 116001 2014 · 16 pages, 4 figures accepted for publication in J. Phys.: Cond. Mat
arxiv created 2014/01/08 · openalex publication_date 2014/03/03 · arxiv updated 2014/03/06 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The Gd3Ga5-xAlxO12 (0 ≤ x ≤ 5) solid solution has been prepared using ceramic synthesis routes and the structural and magnetic properties were investigated using x-ray diffraction, magnetic susceptibility, χ, and isothermal magnetisation, M(H), measurements. Our results indicate a contraction of the unit cell and more significant antiferromagnetic interactions as x increases. Despite the decrease in the magnetic polarisation on the application of a field and the corresponding decrease in the change in the magnetic entropy, ΔS, we find that Gd3Al5O12 has a significantly higher observed (17%) and theoretical (14%) ΔS per unit mass than Gd3Ga5O12. The theoretical increase in ΔS per unit volume (7%) is offset by the increased antiferromagnetic interactions in Gd3Al5O12. The differences in ΔS are driven by a decrease in both the mass and the density as Al ions replace Ga ions. These results highlight the importance of changes to the crystal structure when considering materials for solid state magnetic cooling.