Abstract: Scanning electron microscopy, energy-dispersive and X-ray photoelectron spectroscopies, as well as X-ray diffraction analysis were used to study the morphology, microstructure and chemical composition of surface and subsurface layers of Pt(poly) after treatment in O2 at T = 600–1400 K. It was found that the Pt(poly) microstructure is determined by the reaction of O2 with the surface carbon and platinum recrystallization. At T = 600–1000 K a part of the surface graphite-like film is removed and the surface microstructure remains virtually unchanged. The fcc lattice parameter of platinum (a), the size of the coherent scattering region (D), and microdistortion of the metal lattice (ε) virtually do not change and are equal to 3.920 Å, 100 nm and 0.05%, respectively. At T > 1000 K, the а value remains virtually constant and sizes of D, grains and microfacets substantially increase to ca. 500–600 nm, 40 and 1 μm, whereas the ε value decreases to ca. 0.014%. At T = 600–1400 K, dissolution of oxygen in the platinum lattice and formation of bulk PtO2 oxide are not observed; however, oxygen is able to accumulate at grain boundaries and other defects in the amount of 5–10 at.%.

Cite: Salanov A.N. , Kochurova N.M. , Serkova A.N. , Kalinkin A.V. , Isupova L.A. , Parmon V.N.
Oxidation and Recrystallization of Platinum Group Metals (Pt, Pd, Rh) in Oxygen. Surface and Subsurface Reconstruction of Polycrystalline Platinum During Annealing in the O2 Atmosphere over the Temperature Range of 600–1400 K
Applied Surface Science. 2019. V.490. P.188-203. DOI: 10.1016/j.apsusc.2019.05.289 WOS Scopus РИНЦ ANCAN OpenAlex

Dates:

Submitted:	Mar 1, 2019
Accepted:	May 24, 2019
Published online:	Jun 4, 2019
Published print:	Oct 1, 2019

Identifiers:

Web of science:	WOS:000472709100022
Scopus:	2-s2.0-85067807661
Elibrary:	41650856
Chemical Abstracts:	2019:1181582
Chemical Abstracts (print):	171:183625
OpenAlex:	W2948759278

Citing:

DB	Citing
Scopus	14
Web of science	14
Elibrary	12
OpenAlex	16

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