Crystal growth and magnetic properties of Ln-Mn-Al (Ln=Gd, Yb) compounds of the CaCr2Al10 and ThMn12 structure types

Fulfer, Bradford W.; Haldolaarachchige, Neel; Young, David P.; Chan, Julia Y.

doi:10.1016/j.jssc.2012.05.002

Cited by 15 publications

(14 citation statements)

References 21 publications

(39 reference statements)

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“…1, consisting of two Mn sublattices that form square plaquettes displaced along the c-axis. Our X-ray structure analysis, described in detail in [42], rules out the appreciable site disorder reported in other compounds forming in this and related structure-types [43][44][45]. Like YFe 2 Al 10 [46,47], CaMn 2 Al 10 is stoichiometric and highly ordered.…”

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confidence: 74%

CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order

et al. 2015

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We report the discovery of CaMn2Al10, a metal with strong magnetic anisotropy and moderate electronic correlations. Magnetization measurements find a Curie-Weiss moment of 0.83 µB/Mn, significantly reduced from the Hund's rule value, and the magnetic entropy obtained from specific heat measurements is correspondingly small, only ≈ 9 % of Rln 2. These results imply that the Mn magnetism is highly itinerant, a conclusion supported by density functional theory calculations that find strong Mn-Al hybridization. Consistent with the layered nature of the crystal structure, the magnetic susceptibility χ is anisotropic below 20 K, with a maximum ratio of χ [010] /χ [001] ≈ 3.5. A strong power-law divergence χ(T ) ∼ T −1.2 below 20 K implies incipient ferromagnetic order, and an Arrott plot analysis of the magnetization suggests a vanishingly low Curie temperature TC ∼ 0. Our experiments indicate that CaMn2Al10 is a rare example of a Mn-based weak itinerant magnet that is poised on the verge of ferromagnetic order.

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confidence: 74%

CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order

et al. 2015

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“…O objetivo deste trabalho é desenvolver uma descrição termodinâmica simples, como compostos estequiométricos, dos dois principais compostos ternários da região rica em Al do sistema, o Al8Mn4Ce (T1) e Al10Mn7Ce2 (T2) viabilizando o estudo mais preciso das transformações que ocorrem no sistema. O modelamento como compostos estequiométricos é uma aproximação, pois ambos compostos apresentam certa solubilidade de Al [15][16][17][18]. A incorporação das descrições termodinâmicas destas fases foi feita à base de dados COST507 [19], base de dados aberta e própria para metais leves.…”

Section: Introductionunclassified

AVALIAÇÃO TERMODINÂMICA PRELIMINAR DAS FASES TERNÁRIAS RICAS EM AL NO SISTEMA Al-Mn-Ce

Coury¹,

Botta²,

Bolfarini³

et al. 2018

ABM Proceedings

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ResumoLigas Al-Mn-Ce são de grandeinteresse por formaremfases e microestruturasde aplicação promissora, como quasicristais, fase amorfa e ligas cristalinas de alta resistência. Entretanto, pouca atenção foi dada àdeterminação do diagrama de fase desse sistema. Este trabalho apresenta uma avaliação termodinâmica preliminar das fases ternárias Al8Mn4Ce e Al10Mn7Ce2, compostos da região de maior interesse deste sistema:as composições ricas em Al. A avaliação termodinâmica foi feita considerando os dois compostos como fases estequiométricas. A energia livre destas fases foi estimada a partir de dados experimentais obtidos por análise de calorimetria diferencial de varredura, microscopia eletrônica e difração de raios X e as seções isotermas existentes na literatura, empregando ligas obtidas por fusão a arco. Os resultados indicam que foi possível produzir as fases de interesse pela metodologia proposta, e que os parâmetros estimados para a energia livre de ambas as fases permitem reproduzir adequadamente secções isotermas do diagrama ternário em diferentes temperaturas. Palavras-chave: Ligas de Al; Diagrama de fase; CALPHAD; Thermocalc. PRELIMINARY ASSESSMENT OF TERNARY PHASES IN THE AL RICH REGIONOF THE Al-Mn-Ce SYSTEM Abstract Alloys in the Al-Mn-Ce system have drawn considerable attention recently, as they are reported to form promising phases and microstructures such as quasicrystals, metallic glasses and high strength crystalline composites. However, limited attention has been paid to the determination of the system ternary phase diagram. In this work, two phases were described thermodynamically, namely the Al8Mn4Ce and Al10Mn7Ce2, both in the Al rich region of the system. Both phases were described as stoichiometric compounds and their free energy were assessed based on results ofdifferential scanning calorimetry, X-Ray Diffraction and Scanning Electron Microscopy using samples obtained via arc melting. The results show that it is possible to produce the desired phases with the proposed method and that the assessed thermodynamic values result in an adequate ternary sections of the system phase diagram.

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“…18 REMn 2 Al 10 and RERe 2 Al 10 (RE = Y, La−Nd, Sm, Gd−Dy, Yb) crystallize in either the ThMn 12 -or CaCr 2 Al 10 -type structures. 32,33 In recent years, YbFe 2 Al 10 -type compounds have captured considerable attention because CeTM 2 Al 10 (TM = Fe, Ru, and Os) have shown remarkable c-f hybridization, resulting in valence-fluctuation behavior as well as Kondo-like behavior. In contrast, other REFe 2 Al 10 compounds were found to be antiferromagnetic (RE = Sm−Tm) or paramagnetic (RE = Pr, Nd, and Yb).…”

Section: ■ Introductionmentioning

confidence: 99%

“…In terms of the general structural behavior of compounds of this type, RETM 2 Al 10 , REFe 2 Al 10 (RE = Y, La−Nd, Sm, Gd−Lu), RERu 2 Al 10 (Y, La−Nd, Sm, Gd, Tb, Ho−Yb), 26 REOs 2 Al 10 (La−Nd, Sm, Gd), 27,28 and UTM 2 Al 10 (TM = Fe, Ru, Os) 29−31 adopt the prototypical YbFe 2 Al 10 structure, which is an orthorhombic variant of the tetragonal ThMn 12 structure. 18 32,33 In recent years, YbFe 2 Al 10 -type compounds have captured considerable attention because CeTM 2 Al 10 (TM = Fe, Ru, and Os) have shown remarkable c-f hybridization, resulting in valence-fluctuation behavior as well as Kondo-like behavior. In contrast, other REFe 2 Al 10 compounds were found to be antiferromagnetic (RE = Sm−Tm) or paramagnetic (RE = Pr, Nd, and Yb).…”

Section: ■ Introductionmentioning

confidence: 99%

“…In terms of the general structural behavior of compounds of this type, RETM 2 Al 10 , REFe 2 Al 10 (RE = Y, La–Nd, Sm, Gd–Lu), RERu 2 Al 10 (Y, La–Nd, Sm, Gd, Tb, Ho–Yb), REOs 2 Al 10 (La–Nd, Sm, Gd), , and UTM 2 Al 10 (TM = Fe, Ru, Os) − adopt the prototypical YbFe 2 Al 10 structure, which is an orthorhombic variant of the tetragonal ThMn 12 structure . REMn 2 Al 10 and RERe 2 Al 10 (RE = Y, La–Nd, Sm, Gd–Dy, Yb) crystallize in either the ThMn 12 - or CaCr 2 Al 10 -type structures. , …”

Section: Introductionmentioning

confidence: 99%

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Crystal Growth, Structural, Electrical, and Magnetic Properties of Mixed-Valent Compounds YbOs₂Al₁₀ and LuOs₂Al₁₀

Zhang

Feng

et al. 2014

Inorg. Chem.

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Single crystals of YbOs2Al10 and LuOs2Al10 were grown for the first time using an aluminum self-flux method. The compounds crystallized into a cagelike structure in space group Cmcm, similar to the prototype compound YbFe2Al10. YbOs2Al10 exhibited a mixed-valent nature, as determined by magnetic susceptibility measurements over a wide temperature range from 2 to 900 K, in which the inter-configuration-fluctuation model revealed a broad peak around 400 K. In contrast, LuOs2Al10 displayed Pauli-like paramagnetic behavior over the same temperature range. Both compounds were metallic in nature between 2 and 300 K. The electronic specific heat coefficient of 21.3(2) mJ mol(-1) K(-2) for YbOs2Al10 was determined to be larger than that for LuOs2Al10 [8.9(1) mJ mol(-1) K(-2)], reflecting the mixed-valent nature of the former. First-principles calculations predicted the presence of a mixed-valent state in YbOs2Al10, in agreement with the experimental observations. The novel compound YbOs2Al10 elucidates the evolution of the mixed-valent nature of the Yb-based ternary transition metal aluminides from the 3d to 5d elements.

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Crystal growth and magnetic properties of Ln-Mn-Al (Ln=Gd, Yb) compounds of the CaCr2Al10 and ThMn12 structure types

Cited by 15 publications

References 21 publications

CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order

CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order

AVALIAÇÃO TERMODINÂMICA PRELIMINAR DAS FASES TERNÁRIAS RICAS EM AL NO SISTEMA Al-Mn-Ce

Crystal Growth, Structural, Electrical, and Magnetic Properties of Mixed-Valent Compounds YbOs₂Al₁₀ and LuOs₂Al₁₀

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Crystal growth and magnetic properties of Ln-Mn-Al (Ln=Gd, Yb) compounds of the CaCr2Al10 and ThMn12 structure types

Cited by 15 publications

References 21 publications

CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order

CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order

AVALIAÇÃO TERMODINÂMICA PRELIMINAR DAS FASES TERNÁRIAS RICAS EM AL NO SISTEMA Al-Mn-Ce

Crystal Growth, Structural, Electrical, and Magnetic Properties of Mixed-Valent Compounds YbOs2Al10 and LuOs2Al10

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Crystal Growth, Structural, Electrical, and Magnetic Properties of Mixed-Valent Compounds YbOs₂Al₁₀ and LuOs₂Al₁₀