Synthesis of Pt–Zn and Au–Zn compounds by isopiestic method

Sasaki, Hideaki; Nagai, Takashi; Maeda, Masafumi

doi:10.1016/j.jallcom.2010.05.146

Cited by 12 publications

(6 citation statements)

References 15 publications

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“…Synthesis of γ 1 -Pt 3 Zn 10 and r-PtZn 1.7 has been reported previously. 13 Pt−90% Zn and Pt−92% Zn are synthesized by the "melting method". Zn and γ 1 -Pt 3 Zn 10 of predefined weights are heated at 1223 K for 2 h in a sealed quartz tube and then cooled by dipping the tube into water.…”

Section: Methodsmentioning

confidence: 99%

“…In the synthesis of υ-PtZn (condition 2), brass (Cu–35% Zn, The Nilaco Co.) is used as a Zn vapor source. Synthesis of γ 1 -Pt 3 Zn 10 and r-PtZn 1.7 has been reported previously …”

Section: Methodsmentioning

confidence: 99%

“…As shown in previous research, Pt and Zn form several kinds of intermetallic compounds (see Supporting Information 1). 11,12 Homogeneous compounds are synthesized in this study by an isopiestic vapor pressure method, 8,13 in which Pt is alloyed with Zn supplied through the gas phase. Pt sheets (99.95%, Tanaka Kikinzoku Kogyo K. K.) supported by a tungsten wire (0.5 mm in diameter, 99.95%, The Nilaco Co.) are sealed in a quartz tube under vacuum together with Zn vapor sources.…”

Section: Methodsmentioning

confidence: 99%

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Enhanced Dissolution of Pt from Pt–Zn Intermetallic Compounds and Underpotential Dissolution from Zn-Rich Alloys

Sasaki

Maeda

2013

J. Phys. Chem. C

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Anodic dissolutions of Pt and Zn from Pt−Zn compounds in 5 mol L −1 hydrochloric acid have been directly monitored by the channel flow double electrode method to investigate the mechanism of enhanced dissolution of precious metals by alloying with less noble metals. The enhancement of Pt dissolution shows strong dependence on the compound composition formed during the alloying process and is more prominent from r-PtZn 1.7 and γ 1 -Pt 3 Zn 10 than υ-PtZn and γ-Pt 2 Zn 11 . In addition, linear sweep voltammograms of Pt−92% Zn alloys show dissolution of Pt below 0.2 V vs SHE, which is far lower than the standard potential for the reaction (0.74 V). The result is explained by an activation of Pt through the preferential dissolution of Zn from the alloys. Such theoretically proposed "underpotential dissolution" is demonstrated for Pt−Zn alloys experimentally for the first time in the present study.

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Section: Methodsmentioning

confidence: 99%

“…In the synthesis of υ-PtZn (condition 2), brass (Cu–35% Zn, The Nilaco Co.) is used as a Zn vapor source. Synthesis of γ 1 -Pt 3 Zn 10 and r-PtZn 1.7 has been reported previously …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Dissolution of Pt from Pt–Zn Intermetallic Compounds and Underpotential Dissolution from Zn-Rich Alloys

Sasaki

Maeda

2013

J. Phys. Chem. C

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“…Zinc activity values of the PtÀ Zn system plotted against atomic percentage of zinc. [53][54][55] The homogeneity range of the intermetallic compound ZnPt at 900°C is indicated by dashed lines . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57…”

Section: Figurementioning

confidence: 99%

Corrosion‐Free EMF Measurements of Zinc‐Based Intermetallic Compounds at Ambient Temperature

Kriegel

Armbrüster

2020

ChemPhysChem

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Material development requires in many cases information about the necessary stability of the materials against oxidation, which is encoded in the chemical activity of the constituting elements. Determination of the chemical activity is tedious, especially for metallic materials at or close to ambient temperature. To determine the chemical activity of Zn at ambient temperature, electromotive force (EMF) measurements on the intermetallic compounds ZnPd, ZnPt and Cu 5 Zn 8 within their respective homogeneity range were conducted. The single-phase nature of the samples was confirmed by powder X-ray diffraction, light microscopy as well as SEM/EDX analysis. To exclude oxidation, and therefore faulty determination of the electrochemical potentials, a method was developed to conduct the electro-chemical measurements under non-corrosive conditions in inert atmosphere. Corrosion by the electrolyte was avoided using anhydrous dimethylformamide as aprotic solvent. From the EMF the respective intrinsic activities of zinc in the corresponding intermetallic compounds was determined. Measurements on Cu 5 Zn 8 and comparison to available data in literature verified the developed method allowing to retrieve thermodynamic data of ZnPd and ZnPt for the first time at ambient temperature. The herein developed and easy-to-use methodology is applicable to a wide range of metallic material by choosing appropriate compositions of the electrolyte and has the potential to boost material development.[a] Dr.

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“…To examine any electronic influence on the stabilization of 1 -AuZn 2.1 , an ordered model compound, i.e. 'Au 72 Zn 154 ', was constructed using the refined crystallographic results and used for calculation by the tight binding linear muffin-tin orbital (TB-LMTO) method with the atomic spheres approximation (ASA) (Sasaki et al, 2010;Andersen, 1975;Andersen & Jepsen, 1984;Andersen et al, 1985;Lambrecht & Andersen, 1986). Exchange and correlation were treated in the von Barth-Hedin local density approximation (von Barth & Hedin, 1972).…”

Section: Electronic Structure Calculationsmentioning

confidence: 99%

Structure and stability of γ₁-AuZn_2.1: a γ-brass-related complex phase in the Au–Zn System

Koley

Thimmaiah

Lidin

et al. 2020

Acta Crystallogr B Struct Sci Cryst Eng Mater

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γ1-AuZn2.1 in the Au–Zn binary system has been synthesized and its structure analyzed by single-crystal X-ray diffraction. It crystallizes in the trigonal space group P31m (No. 157) with ∼227 atoms per unit cell and represents a \surd3a × \surd3a × c superstructure of rhombohedrally distorted γ-Au5–x Zn8+y . The structure is largely tetrahedrally closed packed. The formation of γ1-AuZn2.1 can be understood within the framework of a Hume-Rothery stabilization mechanism with a valence electron concentration of 1.68 e/a (valence electrons per atom).

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Synthesis of Pt–Zn and Au–Zn compounds by isopiestic method

Cited by 12 publications

References 15 publications

Enhanced Dissolution of Pt from Pt–Zn Intermetallic Compounds and Underpotential Dissolution from Zn-Rich Alloys

Enhanced Dissolution of Pt from Pt–Zn Intermetallic Compounds and Underpotential Dissolution from Zn-Rich Alloys

Corrosion‐Free EMF Measurements of Zinc‐Based Intermetallic Compounds at Ambient Temperature

Structure and stability of γ₁-AuZn_2.1: a γ-brass-related complex phase in the Au–Zn System

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Synthesis of Pt–Zn and Au–Zn compounds by isopiestic method

Cited by 12 publications

References 15 publications

Enhanced Dissolution of Pt from Pt–Zn Intermetallic Compounds and Underpotential Dissolution from Zn-Rich Alloys

Enhanced Dissolution of Pt from Pt–Zn Intermetallic Compounds and Underpotential Dissolution from Zn-Rich Alloys

Corrosion‐Free EMF Measurements of Zinc‐Based Intermetallic Compounds at Ambient Temperature

Structure and stability of γ1-AuZn2.1: a γ-brass-related complex phase in the Au–Zn System

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Structure and stability of γ₁-AuZn_2.1: a γ-brass-related complex phase in the Au–Zn System