Crystal structures of the Al-Ti-Pt τ5 and τ6 phases solved by zonal precession electron diffraction

S. Samuha; D. Pavlyuchkov; O. V. Zaikina; B. Grushko; L. Meshi

doi:10.1016/j.jallcom.2014.09.175

Crystal structures of the Al-Ti-Pt τ₅ and τ₆ phases solved by zonal precession electron diffraction

S. Samuha, D. Pavlyuchkov, O. V. Zaikina, B. Grushko, L. Meshi

Department of Materials Engineering

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The earlier reported Al-Ti-Pt phases τ₅ and τ₆ were studied using Precession Electron Diffraction (PED) and Convergent Beam Electron Diffraction (CBED). Their atomic models were proposed applying Direct Methods to the PED zonal data. The τ₅-phase (FeCr-type, P4₂/mnm, a = 9.702 and c = 5.023 A˚) can be described by the formula Al₂Ti₅Pt₃, positioning 18 Ti, eight Pt and four Al atoms at five unique atomic positions in the unit cell. The τ₆-phase (P2₁3, a = 6.8477 A˚) can be described by the formula Al₃Ti₅Pt₂. Its unit cell consists of 20 atoms at 12b and two 4a atomic positions occupied by Ti, Pt and Al atoms, respectively. Due to deviation from the stoichiometry, the τ₆-phase can be related to a defect variant of the Au₄Al-type structure. The structures of the studied phases are presented as the stacking of coordination polyhedra.

Original language	English
Pages (from-to)	47-52
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	621
DOIs	https://doi.org/10.1016/j.jallcom.2014.09.175
State	Published - 5 Feb 2015

Keywords

Crystal structure
Electron diffraction
Intermetallics
Structure solution

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2014.09.175

Cite this

@article{845c45151e5149068db01863b282bbae,

title = "Crystal structures of the Al-Ti-Pt τ5 and τ6 phases solved by zonal precession electron diffraction",

abstract = "The earlier reported Al-Ti-Pt phases τ5 and τ6 were studied using Precession Electron Diffraction (PED) and Convergent Beam Electron Diffraction (CBED). Their atomic models were proposed applying Direct Methods to the PED zonal data. The τ5-phase (FeCr-type, P42/mnm, a = 9.702 and c = 5.023 A˚) can be described by the formula Al2Ti5Pt3, positioning 18 Ti, eight Pt and four Al atoms at five unique atomic positions in the unit cell. The τ6-phase (P213, a = 6.8477 A˚) can be described by the formula Al3Ti5Pt2. Its unit cell consists of 20 atoms at 12b and two 4a atomic positions occupied by Ti, Pt and Al atoms, respectively. Due to deviation from the stoichiometry, the τ6-phase can be related to a defect variant of the Au4Al-type structure. The structures of the studied phases are presented as the stacking of coordination polyhedra.",

keywords = "Crystal structure, Electron diffraction, Intermetallics, Structure solution",

author = "S. Samuha and D. Pavlyuchkov and Zaikina, {O. V.} and B. Grushko and L. Meshi",

year = "2015",

month = feb,

day = "5",

doi = "10.1016/j.jallcom.2014.09.175",

language = "English",

volume = "621",

pages = "47--52",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Crystal structures of the Al-Ti-Pt τ5 and τ6 phases solved by zonal precession electron diffraction

AU - Samuha, S.

AU - Pavlyuchkov, D.

AU - Zaikina, O. V.

AU - Grushko, B.

AU - Meshi, L.

PY - 2015/2/5

Y1 - 2015/2/5

N2 - The earlier reported Al-Ti-Pt phases τ5 and τ6 were studied using Precession Electron Diffraction (PED) and Convergent Beam Electron Diffraction (CBED). Their atomic models were proposed applying Direct Methods to the PED zonal data. The τ5-phase (FeCr-type, P42/mnm, a = 9.702 and c = 5.023 A˚) can be described by the formula Al2Ti5Pt3, positioning 18 Ti, eight Pt and four Al atoms at five unique atomic positions in the unit cell. The τ6-phase (P213, a = 6.8477 A˚) can be described by the formula Al3Ti5Pt2. Its unit cell consists of 20 atoms at 12b and two 4a atomic positions occupied by Ti, Pt and Al atoms, respectively. Due to deviation from the stoichiometry, the τ6-phase can be related to a defect variant of the Au4Al-type structure. The structures of the studied phases are presented as the stacking of coordination polyhedra.

AB - The earlier reported Al-Ti-Pt phases τ5 and τ6 were studied using Precession Electron Diffraction (PED) and Convergent Beam Electron Diffraction (CBED). Their atomic models were proposed applying Direct Methods to the PED zonal data. The τ5-phase (FeCr-type, P42/mnm, a = 9.702 and c = 5.023 A˚) can be described by the formula Al2Ti5Pt3, positioning 18 Ti, eight Pt and four Al atoms at five unique atomic positions in the unit cell. The τ6-phase (P213, a = 6.8477 A˚) can be described by the formula Al3Ti5Pt2. Its unit cell consists of 20 atoms at 12b and two 4a atomic positions occupied by Ti, Pt and Al atoms, respectively. Due to deviation from the stoichiometry, the τ6-phase can be related to a defect variant of the Au4Al-type structure. The structures of the studied phases are presented as the stacking of coordination polyhedra.

KW - Crystal structure

KW - Electron diffraction

KW - Intermetallics

KW - Structure solution

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DO - 10.1016/j.jallcom.2014.09.175

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