Phase transformations in sputter deposited NiMn thin films

Huang, Mianliang; Ladwig, Peter F.; Chang, Y. A.

doi:10.1016/j.tsf.2004.10.025

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…Only one exothermic peak was observed at around 410 and 370°C for PdMn and PdPtMn, respectively, which is similar to PtMn ͑Ref. 8͒ and Pd 3 In ͑Ref. 22͒ thin films but rather different from the NiMn ͑Refs.…”

Section: Resultsmentioning

confidence: 80%

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Phase transformation in sputter-deposited PdMn and PdPtMn thin films

Huang

Chang

2006

Journal of Applied Physics

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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.

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Section: Resultsmentioning

confidence: 80%

“…No MnO peaks were observed in the XRD patterns of the annealed PdMn and PdPtMn thin films, which is contrast to our previous studies in NiMn thin films. 2,3 The plan-view bright field TEM images and selected area diffraction ͑SAD͒ patterns of the as-deposited and annealed PdMn and PdPtMn thin films are shown in Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

Phase transformation in sputter-deposited PdMn and PdPtMn thin films

Huang

Chang

2006

Journal of Applied Physics

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“…In addition, different phases have been observed in some thin films due to different deposition processes and substrates by other authors. 25,26 Figure 5 shows representative XRD patterns of samples in library 2 taken at intervals along library 2. Library 2 contains less Ta than library 1.…”

Section: B2mentioning

confidence: 99%

Investigation of Sputtered Ta-Ni-C as an Electrocatalyst for the Oxygen Reduction Reaction

Yang

Bonakdarpour

Dhan

2007

J. Electrochem. Soc.

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Thin film libraries of Ta x Ni y C 1−x−y ͑0.1 Ͻ x Ͻ 0.5,0 Ͻ y Ͻ 0.9͒ and Ta 1−x−y Ni x C y ͑0.1 Ͻ x Ͻ 0.18,0.82 Ͻ y Ͻ 0.86͒ were prepared combinatorially by dc magnetron sputtering. The as-sputtered Ta x Ni y C 1−x−y libraries with x Ͼ 0.2 showed good stability in 1.0 M H 2 SO 4 at 80°C, which indicates that good passivation against corrosion is provided by the Ta component in the ternary. The electrocatalytic activities of the Ta x Ni y C 1−x−y ͑0.1 Ͻ x Ͻ 0.5,0 Ͻ y Ͻ 0.9͒ and Ta 1−x−y Ni x C y ͑0 Ͻ x Ͻ 0.18,0.82 Ͻ y Ͻ 0.86͒ libraries before and after heat-treatment toward the oxygen reduction reaction were studied in 0.1 M. HCIO 4 solution using the rotating disk electrode technique. The heat-treated Ta x Ni y C 1−x−y ͑0.1 Ͻ x Ͻ 0.5,0 Ͻ y Ͻ 0.9͒ libraries showed obvious electrocatalytic activity while the same libraries before heat-treatment did not. The catalytic activity of the libraries improved with increasing Ni content. The best catalytic activity was found near Ta 0.26 Ni 0.73 ͑Ta 0.26 Ni 0.73 C 0.01 ͒ in the heated Ta x Ni y C 1−x−y ͑0.1 Ͻ x Ͻ 0.5,0 Ͻ y Ͻ 0.9͒ libraries and near Ni 0.16 C 0.83 ͑Ta 0.01 Ni 0.16 C 0.83 ͒ in the heated Ta 1−x−y Ni x C y ͑0 Ͻ x Ͻ 0.18,0.82 Ͻ y Ͻ 0.86͒ library. The results suggest that the heat-treatment and the Ni component play important roles in the electrocatalytic activity of this ternary system.Polymer electrolyte membrane fuel cells ͑PEMFCs͒, as a promising energy conversion device for transportation, stationary, and portable applications, have attracted a lot of attention due to their high energy densities, low operating temperatures, and lack of emissions. 1-3 The high cost of PEMFC is one of the limiting factors for their commercialization. The development of non-noble metal catalysts for reduction of oxygen at the cathode of the PEMFC could lead to significant cost reduction. Non-noble metal catalysts such as organometallic complexes, 4-6 pyrolyzed carbon-supported metal salts, 7,8 pyro1yzed carbon-supported N 4 -metal macrocycles, [9][10][11][12][13]

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“…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.…”

Section: Introductionmentioning

confidence: 99%