Phase transformation in sputter-deposited PdMn and PdPtMn thin films

Abstract

The phase transformations of PdMn and PdPtMn films were investigated using differential scanning calorimetry ͑DSC͒, x-ray diffraction ͑XRD͒, and transmission electron microscopy ͑TEM͒. The enthalpy for the fcc to L1 0 transformation in the PdMn and PdPtMn thin films has been measured by DSC as −5.4 and −7.6 kJ/ mol at., respectively. The fcc to L1 0 phase transformation was identified by XRD and TEM on as-deposited and annealed samples. The transition temperature for the PdPtMn is approximately 40°C lower than that for PdMn. PdPtMn thin films have better corrosion resistance than PdMn.

Identification of chemicals resulted in selective glycerol conversion as sustainable fuel on Pd-based anode nanocatalysts

“…Although the diffractogram of the PdMn/C material does not exhibit any peak related to the Mn element, as already described in the literature, 19,43,44 TEM and EDX analyses provided evidences of the presence of Mn oxides. The diffractogram of Pd containing the iron element displays other peaks at 35, 57 and 63 which can be attributed to the Fe 2 O 3 phases.…”

“…The diffractogram of Pd containing the iron element displays other peaks at 35, 57 and 63 which can be attributed to the Fe 2 O 3 phases. Although the diffractogram of the PdMn/C material does not exhibit any peak related to the Mn element, as already described in the literature, 19,43,44 TEM and EDX analyses provided evidences of the presence of Mn oxides. They are probably not well crystallized, but under amorphous form, because of the microwave-assisted approach undertaken without ultimate heat-treatment stage.…”

Disorder–order phase transformation in sputter deposited Pd3In thin films

“…Sputtering deposition, one of the widely used thin films preparation methods, can also lead to the formation of metastable phases. For example, metastable or amorphous phases were also found in the sputter deposited NiMn [4][5][6], PtMn [7], PtPdMn [8], and Ni 3 Al [3,9] films. While stoichiometric Pd 3 In is stable up to 1223 • C [10], it was found in the previous studies [11][12][13] that Pd 3 In alloys with ordered tetragonal structure transformed into disordered face centered cubic (fcc) phase by plastic deformation and became ordered upon subsequent annealing.…”