Structural, Mössbauer spectroscopic and magnetochemical investigations into EuPt5, TmPt5 and TmPt3 synthesized from platinum and gaseous lanthanide
Identifieur interne : 000D95 ( Istex/Checkpoint ); précédent : 000D94; suivant : 000D96Structural, Mössbauer spectroscopic and magnetochemical investigations into EuPt5, TmPt5 and TmPt3 synthesized from platinum and gaseous lanthanide
Auteurs : M. Sauer [Allemagne] ; S. Raetz [Allemagne] ; V. Ohm [Allemagne] ; M. Merkens [Allemagne] ; C. Sauer [Allemagne] ; D. Schmitz [Allemagne] ; H. Schilder [Allemagne] ; H. Lueken [Allemagne]Source :
- Journal of Alloys and Compounds [ 0925-8388 ] ; 1997.
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Abstract
Abstract: EuPt5, TmPt5, and TmPt3 were prepared by reaction of the gaseous lanthanides with Pt at 1200, 1300, and 1500°C respectively. Structural investigations established that the former two crystallize in CaCu5-type related superstructures, the details being still under investigation. 151Eu Mössbauer spectroscopy and magnetic susceptibility measurements revealed that EuPt5 is a mixed-valent europium alloy containing both trivalent (Eu[4f6]) and intermediate-valent Eu, the latter as a dynamic mixture of the [4f6] and [4f7] configurations. The magnetochemical analysis of TmPt1 (AuCu1-type structure) on the basis of a crystal field/molecular field model disclosed trivalent Tm[4f12] with a singlet crystal field ground state and the absence of magnetic ordering (for T≥1.7K).
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DOI: 10.1016/S0925-8388(96)02471-1
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<front><div type="abstract" xml:lang="en">Abstract: EuPt5, TmPt5, and TmPt3 were prepared by reaction of the gaseous lanthanides with Pt at 1200, 1300, and 1500°C respectively. Structural investigations established that the former two crystallize in CaCu5-type related superstructures, the details being still under investigation. 151Eu Mössbauer spectroscopy and magnetic susceptibility measurements revealed that EuPt5 is a mixed-valent europium alloy containing both trivalent (Eu[4f6]) and intermediate-valent Eu, the latter as a dynamic mixture of the [4f6] and [4f7] configurations. The magnetochemical analysis of TmPt1 (AuCu1-type structure) on the basis of a crystal field/molecular field model disclosed trivalent Tm[4f12] with a singlet crystal field ground state and the absence of magnetic ordering (for T≥1.7K).</div>
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