NMR study on Al75-xPd15Mn10+x quasicrystalline alloys

T. Shinohara; A. P. Tsai; T. Masumoto; T. Sato

NMR study on Al_75-xPd₁₅Mn_10+x quasicrystalline alloys

T. Shinohara, A. P. Tsai, T. Masumoto, T. Sato

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

Abstract

²⁷Al- and ⁵⁵Mn nuclear magnetic resonance shift and ²⁷Al spin lattice relaxation time have been measured for six-dimensional face-centered icosahedral quasicrystals, Al_75-xPd₁₅Mn_10+x with x=0, 2 and 7. The Al₇₅Pd₁₅Mn₁₀ quasicrystal exhibits temperature independent Knight shift and (T₁T)^-1=0.022±0.002 (sec K)^-1 from room temperature to 5 K because there exist no Mn atoms with localized magnetic moment. The replacement of Al with Mn atoms decreases the Al-Knight shift, the Mn-Knight shift and spin lattice relaxation time. The Al-Knight shift becomes more negative due to the presence of Mn atoms with localized magnetic moment. There is an additional contribution to the spin lattice relaxation time which is independent of temperature. The Korringa term, (T₁T)^-1, increases with Mn content.

Original language	English
Pages (from-to)	146-150
Number of pages	5
Journal	Materials Transactions
Volume	34
Issue number	2
Publication status	Published - 1993 Jan 1

Keywords

Aluminum-palladium-manganese system
Knight shift
Nuclear magnetic resonance
Quasicrystal
Spin lattice relaxation time

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

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title = "NMR study on Al75-xPd15Mn10+x quasicrystalline alloys",

abstract = "27Al- and 55Mn nuclear magnetic resonance shift and 27Al spin lattice relaxation time have been measured for six-dimensional face-centered icosahedral quasicrystals, Al75-xPd15Mn10+x with x=0, 2 and 7. The Al75Pd15Mn10 quasicrystal exhibits temperature independent Knight shift and (T1T)-1=0.022±0.002 (sec K)-1 from room temperature to 5 K because there exist no Mn atoms with localized magnetic moment. The replacement of Al with Mn atoms decreases the Al-Knight shift, the Mn-Knight shift and spin lattice relaxation time. The Al-Knight shift becomes more negative due to the presence of Mn atoms with localized magnetic moment. There is an additional contribution to the spin lattice relaxation time which is independent of temperature. The Korringa term, (T1T)-1, increases with Mn content.",

keywords = "Aluminum-palladium-manganese system, Knight shift, Nuclear magnetic resonance, Quasicrystal, Spin lattice relaxation time",

author = "T. Shinohara and Tsai, {A. P.} and T. Masumoto and T. Sato",

year = "1993",

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T1 - NMR study on Al75-xPd15Mn10+x quasicrystalline alloys

AU - Shinohara, T.

AU - Tsai, A. P.

AU - Masumoto, T.

AU - Sato, T.

PY - 1993/1/1

Y1 - 1993/1/1

N2 - 27Al- and 55Mn nuclear magnetic resonance shift and 27Al spin lattice relaxation time have been measured for six-dimensional face-centered icosahedral quasicrystals, Al75-xPd15Mn10+x with x=0, 2 and 7. The Al75Pd15Mn10 quasicrystal exhibits temperature independent Knight shift and (T1T)-1=0.022±0.002 (sec K)-1 from room temperature to 5 K because there exist no Mn atoms with localized magnetic moment. The replacement of Al with Mn atoms decreases the Al-Knight shift, the Mn-Knight shift and spin lattice relaxation time. The Al-Knight shift becomes more negative due to the presence of Mn atoms with localized magnetic moment. There is an additional contribution to the spin lattice relaxation time which is independent of temperature. The Korringa term, (T1T)-1, increases with Mn content.

AB - 27Al- and 55Mn nuclear magnetic resonance shift and 27Al spin lattice relaxation time have been measured for six-dimensional face-centered icosahedral quasicrystals, Al75-xPd15Mn10+x with x=0, 2 and 7. The Al75Pd15Mn10 quasicrystal exhibits temperature independent Knight shift and (T1T)-1=0.022±0.002 (sec K)-1 from room temperature to 5 K because there exist no Mn atoms with localized magnetic moment. The replacement of Al with Mn atoms decreases the Al-Knight shift, the Mn-Knight shift and spin lattice relaxation time. The Al-Knight shift becomes more negative due to the presence of Mn atoms with localized magnetic moment. There is an additional contribution to the spin lattice relaxation time which is independent of temperature. The Korringa term, (T1T)-1, increases with Mn content.

KW - Aluminum-palladium-manganese system

KW - Knight shift

KW - Nuclear magnetic resonance

KW - Quasicrystal

KW - Spin lattice relaxation time

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NMR study on Al_75-xPd₁₅Mn_10+x quasicrystalline alloys

Abstract

Keywords

ASJC Scopus subject areas

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