Preparation of well-defined samples of A1PdMn quasicrystals for surface studies

C. J. Jenks; D. W. Delaney; T. E. Bloomer; S. L. Chang; T. A. Lograsso; Z. Shen; C. M. Zhang; P. A. Thiel

doi:10.1016/S0169-4332(96)00536-3

Preparation of well-defined samples of A1PdMn quasicrystals for surface studies

C. J. Jenks, D. W. Delaney, T. E. Bloomer, S. L. Chang, T. A. Lograsso, Z. Shen, C. M. Zhang, P. A. Thiel

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Abstract

We have developed a method for preparing single-grain, quasicrystalline A1PdMn samples for surface studies in ultrahigh vacuum. The main issues of concern are phase purity, the quality of the surface structure, and the surface composition. Phase purity is enhanced by annealing the sample in ultra-pure Ar in a sealed quartz ampoule for several days before polishing. Polishing with colloidal silica allows secondary phases to be detected readily with an optical microscope. As a final precaution, phase purity can be checked sensitively with scanning Auger microscopy. After this stage, the sample can be cleaned in ultrahigh vacuum with ion bombardment. Annealing is required after bombardment to restore surface structure and to obtain a low-energy electron diffraction (LEED) pattern of an oriented sample. However, both ion bombardment and heating to temperatures above 870 K in vacuum, produce Pd-rich surfaces. As a final step, for the five-fold surface, we recommend heating briefly to 1050-1100 K and then annealing at 870 K for several hours. This produces both an excellent LEED pattern, and a surface composition close to that of the bulk.

Original language	English
Pages (from-to)	485-493
Number of pages	9
Journal	Applied Surface Science
Volume	103
Issue number	4
DOIs	https://doi.org/10.1016/S0169-4332(96)00536-3
State	Published - Dec 1996
Externally published	Yes

Funding

We are indebtedt o A.I. Goldman and S.W. Kycia of Iowa State University for help and advice. We thank J.W. Anderegg for making the XPS measurements. This work is supportedb y the Ames Laboratory, which is operatedf or the U.S. Departmento f Energy by Iowa State University under Contract No. W 7405Eng-82.

Funders	Funder number
U.S. Departmento f Energy
Iowa State University
Ames Laboratory

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title = "Preparation of well-defined samples of A1PdMn quasicrystals for surface studies",

abstract = "We have developed a method for preparing single-grain, quasicrystalline A1PdMn samples for surface studies in ultrahigh vacuum. The main issues of concern are phase purity, the quality of the surface structure, and the surface composition. Phase purity is enhanced by annealing the sample in ultra-pure Ar in a sealed quartz ampoule for several days before polishing. Polishing with colloidal silica allows secondary phases to be detected readily with an optical microscope. As a final precaution, phase purity can be checked sensitively with scanning Auger microscopy. After this stage, the sample can be cleaned in ultrahigh vacuum with ion bombardment. Annealing is required after bombardment to restore surface structure and to obtain a low-energy electron diffraction (LEED) pattern of an oriented sample. However, both ion bombardment and heating to temperatures above 870 K in vacuum, produce Pd-rich surfaces. As a final step, for the five-fold surface, we recommend heating briefly to 1050-1100 K and then annealing at 870 K for several hours. This produces both an excellent LEED pattern, and a surface composition close to that of the bulk.",

author = "Jenks, {C. J.} and Delaney, {D. W.} and Bloomer, {T. E.} and Chang, {S. L.} and Lograsso, {T. A.} and Z. Shen and Zhang, {C. M.} and Thiel, {P. A.}",

year = "1996",

month = dec,

doi = "10.1016/S0169-4332(96)00536-3",

language = "English",

volume = "103",

pages = "485--493",

journal = "Applied Surface Science",

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T1 - Preparation of well-defined samples of A1PdMn quasicrystals for surface studies

AU - Jenks, C. J.

AU - Delaney, D. W.

AU - Bloomer, T. E.

AU - Chang, S. L.

AU - Lograsso, T. A.

AU - Shen, Z.

AU - Zhang, C. M.

AU - Thiel, P. A.

PY - 1996/12

Y1 - 1996/12

N2 - We have developed a method for preparing single-grain, quasicrystalline A1PdMn samples for surface studies in ultrahigh vacuum. The main issues of concern are phase purity, the quality of the surface structure, and the surface composition. Phase purity is enhanced by annealing the sample in ultra-pure Ar in a sealed quartz ampoule for several days before polishing. Polishing with colloidal silica allows secondary phases to be detected readily with an optical microscope. As a final precaution, phase purity can be checked sensitively with scanning Auger microscopy. After this stage, the sample can be cleaned in ultrahigh vacuum with ion bombardment. Annealing is required after bombardment to restore surface structure and to obtain a low-energy electron diffraction (LEED) pattern of an oriented sample. However, both ion bombardment and heating to temperatures above 870 K in vacuum, produce Pd-rich surfaces. As a final step, for the five-fold surface, we recommend heating briefly to 1050-1100 K and then annealing at 870 K for several hours. This produces both an excellent LEED pattern, and a surface composition close to that of the bulk.

AB - We have developed a method for preparing single-grain, quasicrystalline A1PdMn samples for surface studies in ultrahigh vacuum. The main issues of concern are phase purity, the quality of the surface structure, and the surface composition. Phase purity is enhanced by annealing the sample in ultra-pure Ar in a sealed quartz ampoule for several days before polishing. Polishing with colloidal silica allows secondary phases to be detected readily with an optical microscope. As a final precaution, phase purity can be checked sensitively with scanning Auger microscopy. After this stage, the sample can be cleaned in ultrahigh vacuum with ion bombardment. Annealing is required after bombardment to restore surface structure and to obtain a low-energy electron diffraction (LEED) pattern of an oriented sample. However, both ion bombardment and heating to temperatures above 870 K in vacuum, produce Pd-rich surfaces. As a final step, for the five-fold surface, we recommend heating briefly to 1050-1100 K and then annealing at 870 K for several hours. This produces both an excellent LEED pattern, and a surface composition close to that of the bulk.

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DO - 10.1016/S0169-4332(96)00536-3

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SP - 485

EP - 493

JO - Applied Surface Science

JF - Applied Surface Science

IS - 4

ER -

Preparation of well-defined samples of A1PdMn quasicrystals for surface studies

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