Solid-solution hardening of Ir by Pt and Ni

Yamabe‐Mitarai, Yoko; Aoki, H.

doi:10.1016/s0167-577x(02)00613-4

Cited by 24 publications

(15 citation statements)

References 11 publications

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“…This increase correlates with the hypothesis that after annealing, the layer is formed by a mixture of Pt and IrO 2 , where IrO 2 has a much higher resistivity than Pt (Table II) [16]. Our observations are consistent with the investigations of other authors [6,17,18], which show that the temperature to oxidize iridium (∼600 • C) is much lower than the one needed for forming Ir-Pt alloys (∼1100 • C). AES depth profiles complements the previous results (Fig.…”

Section: Metal Encapsulationsupporting

confidence: 91%

Spacers Alternatives for INTEGRATION OF (3D) STACKED SBT FeCAP s

Lisoni¹,

Johnson²,

Everaert³

et al. 2003

Integrated Ferroelectrics

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The thermal and mechanical stability of Ir and Ir\Pt metals spacers deposited on top of Ti(Al)N\Ir\IrO 2 patterned structures has been investigated in pseudo 3D stacked SrBi 2 Ta 2 O 9 (SBT) capacitors. Their stability was compared to standard TEOS spacers. The high compressive stress at the edge of patterned electrodes, as a consequence of the high thermal expansion mismatch between the metals used in the electrode and TEOS, make the system mechanically unstable at the SBT crystallization conditions (700 • C for 1 hour). The mechanical problems could be overcome if the same noble metals used in the electrode are incorporated as spacers. However, thermal stability during the SBT crystallization conditions is still an issue. For the case of Ir, surface oxidation decreases the SBT polarization values. In the case of Ir\Pt, Ir diffuses through Pt and oxidizes, leading to unstable patterned structures and to the oxidation of the Ti(Al)N layer.

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Section: Metal Encapsulationsupporting

confidence: 91%

Spacers Alternatives for INTEGRATION OF (3D) STACKED SBT FeCAP s

Lisoni¹,

Johnson²,

Everaert³

et al. 2003

Integrated Ferroelectrics

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“…in Mg the efficiency of solid solution hardening increases monotonically with the increase of |δ | or |η|, or a *Corresponding author (email: rongshichen@yahoo.com) combined misfit parameter of them [8,9]. This relation has been verified for aluminium [10], iridium [11], copper [12], nickel [13], and stainless steel [14] solid solution alloys. However, recent experimental studies [4,5,15,16] have demonstrated that Y and Gd exhibit anomalously higher solid solution hardening efficiency than those of Al and Zn in terms of the misfit parameters, which cannot be understood using the elastic interaction model.…”

mentioning

confidence: 81%

Electronic origin of the anomalous solid solution hardening of Y and Gd in Mg: A first-principles study

et al. 2011

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“…Panat [24], proposed three causes of rumpling: (i) cyclic plastic ratcheting of the bond coat The authors showed in a previous paper that the addition of Ir to Pt increases the Vickers hardness of the as-deposited films and of the aluminized coatings, and attributed this to the effect of solid-solution hardening [13]. Y. Yamabe-Mitarai et al and J. D. Brazzle et al confirmed the solid-solution strengthening effect of Ir in Ir-Ni-Pt ternary alloys and Pt-Ir coatings [25,26]. The harder bond coat would be expected to retard dislocation creep and thus to retard surface rumpling during thermal exposure.…”

Section: Oxidation Kineticsmentioning

confidence: 93%

Oxidation Behavior of Pt–Ir Modified Aluminized Coatings on Ni-base Single Crystal Superalloy TMS-82+

Suzuki

Yamaguchi

et al. 2007

Oxid Met

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The oxidation resistance of Pt-Ir modified aluminized coatings, prepared by magnetron sputtering, was investigated. Cyclic oxidation tests revealed that Pt-30 at%Ir and Pt-50 at%Ir modified aluminide coatings demonstrated a smaller mass change compared with Pt, Pt-80 at%Ir and Ir modified aluminide coatings. Cross-sectional analyses following cyclic oxidation tests showed that the TGO layer formed on the Pt modified aluminide coating surface is almost twice as thick as those on the Pt-30 at%Ir and Pt-50 at%Ir coatings. In addition, the Pt-30 at%Ir and Pt-50 at%Ir samples had a much smoother surface than the Pt modified coatings after cyclic oxidation, and the latter suffered from severe surface rumpling. However, when the Ir content exceeded 80 at% in Pt-Ir modified coatings, internal voids formed during cyclic oxidation. These results show that the addition of 30-50 at%Ir to Pt-modified aluminized coatings is most effective in enhancing oxidation resistance.

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Solid-solution hardening of Ir by Pt and Ni

Cited by 24 publications

References 11 publications

Spacers Alternatives for INTEGRATION OF (3D) STACKED SBT FeCAP s

Spacers Alternatives for INTEGRATION OF (3D) STACKED SBT FeCAP s

Electronic origin of the anomalous solid solution hardening of Y and Gd in Mg: A first-principles study

Oxidation Behavior of Pt–Ir Modified Aluminized Coatings on Ni-base Single Crystal Superalloy TMS-82+

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