Observation of phase transitions in hydrogenated Yttrium films via normalized infrared emissivity

Applications of high throughput (combinatorial) methodologies to electronic, magnetic, optical, and energy-related materials

“…The number of samples to be characterized from a given library can vary from 100 to 1000. [311][312][313] However, there are significant challenges to the thin film approach. For example, a phase that can be synthesized through thin film deposition techniques may not be capable of being produced in kilogram quantities using traditional bulk synthesis techniques.…”

“…It was further demonstrated that this technique could be used to monitor metal to semiconductor, as well as metal to metal transformations; this finding is important since many hydrogen storage materials can exhibit multiple decomposition steps, and not all of the products are insulating. 313,320 CCS libraries of hydrogen storage materials enable measurement of the thermodynamic properties, but to determine reaction kinetics, it is useful to employ thickness wedge libraries, where the importance of grain size on the reaction rates can be studied. Materials such as MgH 2 strongly inhibit the diffusion of hydrogen, and thus present a substantial barrier to efficient hydrogenation.…”

Infrared emissivity of Sr doped lanthanum manganites in coating form

“…The above mentioned phenomenon has been explained by means of double-exchange interaction between Mn 3+ and Mn 4+ , and electron-phonon interaction relating to Jahn-Tellertype lattice distortion of the MnO 6 octahedra [15][16][17]. In general, emissivity of metal is low, while that of insulator is high, and IR emissivity has been used as a potent tool to characterize metal-insulator transition [18]. Thus, without electricity or any accessories, the emissivity of doped manganites can change significantly with temperature due to MI phase transition, which makes them attractive as autonomous thermal control material.…”

In situ infrared thermographic screening of compositional spread Mg–Ti thin-film libraries

“…Successful infrared screening of in situ alloy hydrogenation has already been reported by Olk et al [1,2] in the multicompositional Mg-Ni-Fe system, more recently by Guerin et al [7] and Oguchi et al [8,9] the Mg-Ni system, and by our group in the Mg-Al and Mg-Fe-Cu systems [11]. Apart from the studies where the effect of alloy composition and microstructure on the hydrogenation properties have been thoroughly analysed, other studies have also recently demonstrated the use of IR imaging to characterise heterogeneous growth processes of the hydride phase on solid-state hydrogen storage materials such as Mg-Ti [20] and solving multiple phase transitions that can be found during hydrogen cycling, as in the case of yttrium film [21]. This paper describes the optimisation of infrared thermography as a time-resolved monitoring tool for analysis of the hydriding/dehydriding kinetic properties of a magnesium-titanium combinatorial thin-film library.…”