Age stability of La(Fe,Si)13 hydrides with giant magnetocaloric effects

Structural stability of complex hydrides: LiBH4 revisited.

A systematic approach to study the phase stability of LiBH4 based on ab initio calculations is presented. Three thermodynamically stable phases are identified and a new phase of Cc symmetry is proposed for the first time for a complex hydride. The x-ray diffraction pattern and vibrational spectra of the Cc structure agree well with recently reported experimental data on LiBH4. Calculations of t...

Taming the first-order transition in giant magnetocaloric materials.

Large magnetically driven temperature changes are observed in MnFe(P,Si,B) materials simultaneously with large entropy changes, limited (thermal or magnetic) hysteresis, and good mechanical stability. The partial substitution of B for P in MnFe(P,Si) compounds is found to be an ideal parameter to control the latent heat observed at the Curie point without deteriorating the magnetic properties, ...

Phase Control studies in Gd5Si2Ge2 Giant Magnetocaloric Compound

A systematic set of annealings on arc-melted synthesized Gd5Si2Ge2 sample was performed. Through powder x-ray di raction (XRD) and magnetometry measurements we monitored the effect of varying the annealing time with constant temperature (T = 1473K) on the formation of the Monoclinic (M ) crystallographic phase fraction, which is the one responsible for the Giant Magnetocaloric E ect (GMCE) in t...

Large Inverse Magnetocaloric Effects and Giant Magnetoresistance in Ni-Mn-Cr-Sn Heusler Alloys

The magnetostructural transitions, magnetocaloric effects, and magnetoresistance properties of Ni45Mn43CrSn11 Heusler alloys were investigated using X-ray diffraction (XRD), field-dependent magnetization, and electrical resistivity measurements. A large inverse and direct magnetocaloric effect has been observed in Ni45Mn43CrSn11 across the martensitic and Curie transition temperature, respectiv...

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