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  • 1
    Electronic Resource
    Electronic Resource
    Magnetism and structural chemistry of RECo13−xGax alloys (RE=La,Ce,Pr,Nd, and mischmetal MM) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3504-3507 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Alloys with the composition RECo13−xGax (x≤4.4) have been prepared by arc melting and subsequent annealing for 120 h at 800 °C in evacuated, Mo-lined silica capsules. The Ce,Pr compounds were found to decompose at 900 °C, and no compound formation was observed for the Gd,Sm members in the investigated temperature range from 600 to 900 °C. For the LaCo13−xGax system an extended homogeneity region was observed crystallizing with the cubic NaZn13 type for concentrations x〈2.5. For concentrations x〉2.5 x-ray powder diffraction analysis for all the rare earth members proved isotypism with a tetragonal NaZn13 -derivative structure, whose crystal symmetry and atom sites were consistent with the Ce2Ni17Si9 type of structure. From magnetization experiments in the range from 5 to 1300 K a generally hard-magnetic behavior was observed for all the RE alloys with tetragonal symmetry and ferromagnetic ordering occurs below Tc〈650 K. Curie temperatures in the LaCo13−xGax system monotonically drop from Tc=1290 K for cubic LaCo13 to Tc=145 K for tetragonal LaCo8.7Ga4.3. For the Ce compound ferrimagnetic behavior is suggested. Assuming trivalent rare earth ions, effective paramagnetic moments of the Co atoms decrease as a function of x from 5.9 μB at x=3.1 to ∼3 μB at x=4.3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346362
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetism and crystal chemistry in REFe12−xGax (RE=Y,Ce,Pr,Nd,Sm,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu and MM=mischmetal) and (Zr,Pr) (Fe1−xCox)12−yGay (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3512-3517 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The existence of ternary compounds according to the formula REFe12−x Gax which for x ∼6 represents the iron-rich end of a homogeneous range has been confirmed. X-ray powder analysis of alloys annealed at 800 °C or above generally reveal isotypism with the body- centered tetragonal ThMn12 -type structure. For the alloys with heavier rare-earth elements from Gd to Lu a phase transition to a body-centered orthorhombic structure type (ScFe6 Ga6 type) is observed, which has not been reported before. The transition corresponds to a crystallographic group-subgroup relation (I4/mmm→t2 →Immm), and the transition temperature increases with the ordinal number of the rare earth, indicating the higher the stability of the ScFe6 Ga6 -type structure, the smaller the radius of the rare-earth element. Accordingly, the ThMn12 -type structure is stable for the early rare-earth members and no transition was observed as low as 400 °C. From magnetization curves it is shown that for REFe12−x Gax (RE=rare earth, Y) all magnetic sublattices order simultaneously at temperatures above Tc ∼400 K. For Y, Lu, and light rare-earth-containing alloys collinear or canted ferromagnetism is observed. The vector of magnetization was found to be close to the a,b plane. Strong hysteresis effects are revealed in all alloys. Energy products are highest for (Pr,Sm)Fe∼6Ga∼6. For the compounds with the heavy rare-earth elements a ferrimagnetic behavior is encountered. Both magnetic sublattices, i.e., Fe and RE, couple antiparallel, exhibiting easy plane anisotropy. The crystallographic transformation, tetragonal-orthorhombic, has little effect on the magnetic behavior of these alloys. (Zr,Hf)(Fe1−x Cox )12−y Gay remain temperature-independent paramagnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346336
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  • 3
    Electronic Resource
    Electronic Resource
    Structural chemistry, magnetism and 119Sn Mössbauer spectroscopy of ternary compounds REMn6Sn6 (RE=Pr,Nd,Sm) (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 8447-8450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ternary compounds (Pr,Nd,Sm)Mn6Sn6 have been synthesized by argon arc melting starting from the pure elements. All compounds were found to be isotypic with HoFe6Sn6 (space group Immm-D2h25, no. 71; Z=6). The HoFe6Sn6 type is a stacking variant composed of slabs of the HfFe6Ge6 type and of the ScFe6Ga6 type. The compounds order ferrimagnetically slightly above room temperature exhibiting a strong magnetocrystalline anisotropy. The 119Sn Mössbauer spectra at 15 and 293 K were fitted with five magnetic sextets, with hyperfine fields ranging from 12 to 32 T at 15 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353416
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  • 4
    Electronic Resource
    Electronic Resource
    Samarium-iron based magnet materials with the Th2Zn17-type structure (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7215-7218 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Substitution mode and magnetic behavior in Sm2Fe17 have been investigated as a function of (a) the metal substitution (Fe replaced by Mn, Co, Al, Ga) and (b) the accommodation of interstitial carbon atoms. X-ray powder analysis proved in all cases a consistency with the rhombohedral Th2Zn17-type structure and with a random distribution of the Al-atoms on the iron-sublattice sites. Substitution of iron in Sm2Fe17 by Mn,Co,Al,Ga, and/or carbon leads to an anisotropy change from easy plane to easy axis geometry. In correspondence with the volume expansion, Curie temperatures tend to increase as a result of an enhanced ferromagnetic coupling mechanism. Magnetization values, however, are strongly reduced due to a change of collinear ferrimagnetism to a ferromagnetic type of order of the various magnetic sublattices. The magnetic anisotropy phase diagram at 300 K has been derived for the iron-rich region of the quaternary system Sm2Fe17−x−yCoxAly (0≤x≤8, 0≤y≤3) revealing a wide region of spin reorientation between the fields of easy plane and easy axis anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347615
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetism of ternary compounds RE6Fe13X; RE=Pr, Nd; X=Cu, Ag, Au, Zn, Cd, and Hg (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7745-7751 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Novel compounds RE6Fe13X (X=Cu, Ag, Au, Zn, Cd, Hg) have been synthesized by arc melting (Cu, Ag, Au) or by reaction sintering (Zn, Cd, Hg), followed by heat treatment at 550 or 600 °C up to 350 h in evacuated silica capsules. From room temperature x-ray powder diffraction analyses the alloys were found to crystallize with the ordered Nd6Fe13Si type. The Curie point of all the compounds is found to lie around room temperature. Due to their low magnetization values a ferrimagnetic coupling within the Fe sublattice is suggested. A canted RE-spin structure cannot be ruled out. 57Fe Mössbauer spectra were recorded from the samples with X=Ag and Au. Additionally, 197Au spectra were taken from the two Au-containing compounds. The 57Fe spectra are composed of various subpatterns, originating from the different Fe sites and were found to be essentially unaffected by the specific element RE and X. In all cases under investigation the spectra could only be fitted under the assumption of an easy axis of magnetization lying within the basal plane. The 197Au spectra reveal that the Au atoms predominantely occupy the 4a site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356606
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  • 6
    Electronic Resource
    Electronic Resource
    Al,Ga substitution in RE2Fe17 (RE=Ce,Pr,Nd): Magnetic behavior of RE2Fe15(Al,Ga)2 alloys (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 4963-4967 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Alloys with the composition RE2Fe17 and RE2Fe15X2 (X=Al,Ga) have been synthesized by the arc-melting technique followed by an 125-h anneal at 900–1000 °C in evacuated silica capsules. The new compound Nd2Fe15Ga2 is unstable below 800 °C, and is only obtained by quenching from above 900 °C. From x-ray powder diffraction analysis all alloys except Pr2 Fe15 Ga2 were found to crystallize with the hexagonal Th2 Zn17 type; indications for a preferential occupation of the (6c) sites by the X atoms are small. Substitution of Al, Ga atoms generally leads to a large increase of the Curie temperature and of the magnetocrystalline anisotropy, thereby enhancing the remanence as well as the coercivity. These effects are a consequence of the strongly distance-dependent exchange interactions of the Fe-Fe and Fe-RE coupling mechanisms. As for binary Pr2 Fe17 , the easy axis of magnetization for Pr2 Fe15 Al2 was found to be in the basal plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343218
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic behavior and structural chemistry of RERu3B2 borides (1980)
    s.l. : American Chemical Society
    Inorganic chemistry 19 (1980), S. 3316-3320 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50213a022
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetism of Pr2(Fe1−x−yCoxAly)17 alloys with a Th2Zn17-type structure (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2544-2548 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Alloys with the composition Pr2(Fe1−xCox)17−yAly have been synthesized by the arc-melting technique followed by 125-h annealing at 900 °C in evacuated silica capsules. From room-temperature x-ray powder diffraction analysis a complete solid solution Pr2(Fe1−xCox)17−yAly has been observed for all values of 0≤x≤1 and 0≤y≤5.1. All alloys were found to crystallize with the Th2Zn17-type structure; Al atoms tend to preferentially occupy the (6c) sites. Fe/Co substitution generally leads to an increase of the Curie temperature and of the magnetocrystalline anisotropy, thereby enhancing the remanence as well as the coercivity. These effects are predominantly due to the strongly distant-dependent exchange interactions of the Fe-Fe(Co) and the Fe(Co)–rare-earth coupling mechanism. Whereas most of the alloys exhibit easy-plane magnetism, a small range exists in the Pr2(Fe1−xCox)17−yAly system (0.38〈x〈0.82, 300 K), in which the crystallographic c axis is the direction of easy magnetization. Small amounts of Al, however, close the easy-axis region at y=1.8 (∼300 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345510
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetism and structural chemistry of U1−xYxCu2±ySi2(minus-plus)y, U1−xYxCr2Si2, and U(Cu1−xCrx)2Si2 alloys (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 943-948 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic behavior for the three series of alloys U1−xYxCu2±ySi2(minus-plus)y, U1−xYxCr2Si2, and U(Cu1−xCrx)2Si2 has been studied in the temperature range from 2 to 550 K. In all cases a complete solid solution with the ThCr2Si2 type of structure was observed from x-ray powder analysis with no ordering among the substituting atom species. Whereas YCu2Si2 did not reveal any homogeneous region on Si/Cu substitution, uranium-rich alloys show significant changes in the unit cell dimensions when comparing U1−xYxCu2Si2 and U1−xYxCu2+ySi2−y. In both latter alloy series a negative deviation of the c parameter from Vegard's rule is found almost compensated for by a positive deviation of a when Y is substituted for U. Substitution of Cu by Cr resulted in a linear dependence of the lattice dimensions.YCu2Si2 and YCr2Si2 are temperature independent Pauli paramagnets above 2 K, whereas the UCu2±ySi2(minus-plus)y and the U(Cu1−xCrx)2Si2 systems are characterized by the onset of ferromagnetic ordering at TM =105 K. Above TM all samples are in the paramagnetic state in which the uranium atoms carry an effective moment larger than 2 μB. Saturation moments reveal a maximum for a copper deficiency of y∼0.1, whereas excess copper correlates with a strong magnetocrystalline anisotropy indicating the presence of narrow domain walls. Substitution of U by Y in U1−xYxCu2±ySi2(minus-plus)y leads to a linear decrease of TM and for concentrations of 0.4≤x≤0.8 metamagnetic behavior is observed. The antiferromagnetic transition is followed by a ferromagnetic alignment of the U atoms below the Néel temperature. The maximum of the anisotropy energy coincides with the minimum in the c parameter at x∼0.65. The Y-rich alloys U1−xYxCu2(minus-plus)ySi2±y display antiferromagnetism with a rather complex structure as indicated by the change of sign of the paramagnetic Curie–Weiss temperature θp. In the U1−xYxCr2Si2 alloys the antiferromagnetic coupling is destroyed by rather small amounts of Y.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345729
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetism and specific heat of UIrGa"5 and UPdGa"5
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 11-12 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)90679-I
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