Surface layer self diffusion in icosahedral Al-Pd-Mn quasicrystals

F. Samavat; M. J. Gladys; C. J. Jenks; T. A. Lograsso; B. V. King; D. J. O'Connor

doi:10.1016/j.susc.2007.06.043

Surface layer self diffusion in icosahedral Al-Pd-Mn quasicrystals

F. Samavat, M. J. Gladys, C. J. Jenks, T. A. Lograsso, B. V. King, D. J. O'Connor

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

8 Scopus citations

Abstract

The self diffusion of Mn and Pd in a single grain icosahedral Al_69.9Pd_20.5Mn_9.6 quasicrystal has been determined by low energy ion scattering (LEIS). The diffusion was determined by depositing different elements (Pd, Mn) on the surface and measuring the rate of change in surface composition as a function of temperature by LEIS. The surface composition was monitored over the temperature range of 355-575 K for Mn and 440-745 K for Pd and compared to model calculations to allow the activation energy for diffusion to be determined. Activation energies of 0.20 ± 0.01 eV for Mn and 0.64 ± 0.03 eV for Pd have then been measured for self diffusion in i-Al-Pd-Mn, respectively. No deviation from Arrhenius behavior was detected in the temperature range covered by the present experiments. From the low values of activation energy we propose that this range of diffusion is phason related, reflecting the specific nature of the icosahedral structure.

Original language	English
Pages (from-to)	5678-5682
Number of pages	5
Journal	Surface Science
Volume	601
Issue number	24
DOIs	https://doi.org/10.1016/j.susc.2007.06.043
State	Published - Dec 15 2007
Externally published	Yes

Funding

The authors acknowledge the Ministry of Science and Technology of the Independent Republic of Iran and the Australian Research Council for financial support.

Funders	Funder number
Ministry of Science and Technology of the Independent Republic of Iran
Australian Research Council

Keywords

Al-Pd-Mn
Aluminum
Diffusion
Low energy ion scattering (LEIS)
Manganese
Metallic surfaces
Palladium
Quasicrystals

Access to Document

10.1016/j.susc.2007.06.043

Cite this

@article{775c9f5a0a724b0fb378a7ad36ea4d19,

title = "Surface layer self diffusion in icosahedral Al-Pd-Mn quasicrystals",

abstract = "The self diffusion of Mn and Pd in a single grain icosahedral Al69.9Pd20.5Mn9.6 quasicrystal has been determined by low energy ion scattering (LEIS). The diffusion was determined by depositing different elements (Pd, Mn) on the surface and measuring the rate of change in surface composition as a function of temperature by LEIS. The surface composition was monitored over the temperature range of 355-575 K for Mn and 440-745 K for Pd and compared to model calculations to allow the activation energy for diffusion to be determined. Activation energies of 0.20 ± 0.01 eV for Mn and 0.64 ± 0.03 eV for Pd have then been measured for self diffusion in i-Al-Pd-Mn, respectively. No deviation from Arrhenius behavior was detected in the temperature range covered by the present experiments. From the low values of activation energy we propose that this range of diffusion is phason related, reflecting the specific nature of the icosahedral structure.",

keywords = "Al-Pd-Mn, Aluminum, Diffusion, Low energy ion scattering (LEIS), Manganese, Metallic surfaces, Palladium, Quasicrystals",

author = "F. Samavat and Gladys, {M. J.} and Jenks, {C. J.} and Lograsso, {T. A.} and King, {B. V.} and O'Connor, {D. J.}",

year = "2007",

month = dec,

day = "15",

doi = "10.1016/j.susc.2007.06.043",

language = "English",

volume = "601",

pages = "5678--5682",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier",

number = "24",

}

TY - JOUR

T1 - Surface layer self diffusion in icosahedral Al-Pd-Mn quasicrystals

AU - Samavat, F.

AU - Gladys, M. J.

AU - Jenks, C. J.

AU - Lograsso, T. A.

AU - King, B. V.

AU - O'Connor, D. J.

PY - 2007/12/15

Y1 - 2007/12/15

N2 - The self diffusion of Mn and Pd in a single grain icosahedral Al69.9Pd20.5Mn9.6 quasicrystal has been determined by low energy ion scattering (LEIS). The diffusion was determined by depositing different elements (Pd, Mn) on the surface and measuring the rate of change in surface composition as a function of temperature by LEIS. The surface composition was monitored over the temperature range of 355-575 K for Mn and 440-745 K for Pd and compared to model calculations to allow the activation energy for diffusion to be determined. Activation energies of 0.20 ± 0.01 eV for Mn and 0.64 ± 0.03 eV for Pd have then been measured for self diffusion in i-Al-Pd-Mn, respectively. No deviation from Arrhenius behavior was detected in the temperature range covered by the present experiments. From the low values of activation energy we propose that this range of diffusion is phason related, reflecting the specific nature of the icosahedral structure.

AB - The self diffusion of Mn and Pd in a single grain icosahedral Al69.9Pd20.5Mn9.6 quasicrystal has been determined by low energy ion scattering (LEIS). The diffusion was determined by depositing different elements (Pd, Mn) on the surface and measuring the rate of change in surface composition as a function of temperature by LEIS. The surface composition was monitored over the temperature range of 355-575 K for Mn and 440-745 K for Pd and compared to model calculations to allow the activation energy for diffusion to be determined. Activation energies of 0.20 ± 0.01 eV for Mn and 0.64 ± 0.03 eV for Pd have then been measured for self diffusion in i-Al-Pd-Mn, respectively. No deviation from Arrhenius behavior was detected in the temperature range covered by the present experiments. From the low values of activation energy we propose that this range of diffusion is phason related, reflecting the specific nature of the icosahedral structure.

KW - Al-Pd-Mn

KW - Aluminum

KW - Diffusion

KW - Low energy ion scattering (LEIS)

KW - Manganese

KW - Metallic surfaces

KW - Palladium

KW - Quasicrystals

UR - http://www.scopus.com/inward/record.url?scp=36549043029&partnerID=8YFLogxK

U2 - 10.1016/j.susc.2007.06.043

DO - 10.1016/j.susc.2007.06.043

M3 - Article

AN - SCOPUS:36549043029

SN - 0039-6028

VL - 601

SP - 5678

EP - 5682

JO - Surface Science

JF - Surface Science

IS - 24

ER -

Surface layer self diffusion in icosahedral Al-Pd-Mn quasicrystals

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this