Microstructural control and tuning of thermal conductivity in La0.67Ca0.33MnO3±δ

Influence of thermal conductivity on the dynamic response of magnetocaloric materials

“…Ag-filled and parent LCMO have the same stoichiometry and tolerance factor since they were prepared from the same polycrystalline powders (Turcaud et al, 2013). This aspect supports the idea that the origin of the slower response reported for the parent LCMO may be linked with a markedly different behaviour at the length scale of the grain boundaries.…”

“…La 0.67 Ca 0.33 MnO 3 (labelled LCMO) pellets were prepared from polycrystalline powders synthesized by the glycine nitrate process, as presented by Turcaud et al (2013). This material, beyond its complex and fascinating behaviour across the metal-insulator transition (Turcaud et al, 2014), is interesting also for energy conversion applications since recently similar compositions showed promising results when tested in a refrigeration test device with the combination of a modest and reversible MCE and a good mechanical stability (Turcaud et al, 2013)).…”

“…This material, beyond its complex and fascinating behaviour across the metal-insulator transition (Turcaud et al, 2014), is interesting also for energy conversion applications since recently similar compositions showed promising results when tested in a refrigeration test device with the combination of a modest and reversible MCE and a good mechanical stability (Turcaud et al, 2013)). The Curie temperature of these two systems lies at T C = 258 K.…”

Power Losses in LaFexCoySi1.1Intermetallics near the Magnetic Phase Transition

“…Cooling cycle eciency depends on the thermal conductance of the MCE material. Thermal conductance of rare-earth-based alloys and compounds does not exceed a few W m −1 K −1 , where exemplary the La(Fe 0.88 Si 0.12 ) 13 achieves at the room temperature * corresponding author; e-mail: roman.gozdur@p.lodz.pl k = 9 W m −1 K −1 [7]. The La-containing alloys have attracted attention due to their low price and giant magnetocaloric eect (GMCE).…”

Overview of the Characteristic Features of the Magnetic Phase Transition with Regards to the Magnetocaloric Effect: the Hidden Relationship Between Hysteresis and Latent Heat

“…33,34,35,36 This has resulted in a shift of focus towards material systems that lie closer to the critical point: on the cusp of first order and continuous phase transitions. As this technology approaches maturity it is reasonable to speculate that focus will continue to shift towards tri-critical magnets that can be easily shaped, react well with thermal engineering, and respond rapidly to changing magnetic field.…”