Sm Alloys Research Articles

Effect of Lanthanide Element on Glass-Forming Ability and Local Atomic Structure of Fe–Co–(Ln)–B Amorphous Alloys

The glass-forming ability and the local ordering structures of Fe 70 Co 10 B 20 and Fe 67 Co 10 Ln 3 B 20 (Ln=Sm, Tb or Dy) alloys have been studied by differential scanning calorimetry (DSC), density measurement and X-ray diffraction method. The supercooled liquid region, defined by the temperature interval ΔT x between glass transition temperature T g and onset crystallization temperature T x , appears and is extended by the addition of lanthanide element in Fe-Co-B systems. ΔT x (ΔT x =T x -T g ) is 32 K for Fe 67 Co 10 Sm 3 B 20 , 36 K for Fe 67 Co 10 Tb 3 B 20 and 38 K for Fe 67 Co 10 Dy 3 B 20 . The packing fraction, defined by the ratio of total volume of atoms to the volume of a cell, increases by a few percent in these alloys. The least-squares refining analysis for interference functions as well as the usual radial distribution function analysis shows that the coordination number of transition metals around Fe decreases by the addition of the lanthanide element whereas the change in the coordination number of transition metals around B is not clearly observed within the experimental uncertainty. The lanthanide element is considered to play an important role in forming a dense packing structure so as to rearrange the network of local ordering units of (Fe, Co)-B in these alloys.

Co-methanation of carbon monoxide and carbon dioxide on supported nickel and cobalt catalysts prepared from amorphous alloys

The activity and durability of the catalysts prepared by the oxidation–reduction treatment of amorphous Co-15 at% Zr, Ni-40 at% Zr and Ni-30 at% Zr-10 at% Sm alloys have been investigated for simultaneous methanation of carbon monoxide and carbon dioxide. It has been found that the Ni–30Zr–10Sm catalyst shows the highest activity among the catalysts examined, and the activity of the Co–15Zr catalyst is lower than those of the nickel-based catalysts, in agreement with the activity for the solo methanation of carbon dioxide. On all the catalysts, carbon monoxide reacts preferentially with hydrogen, and is completely converted into methane at and above 523 K. The remaining hydrogen further reacts with carbon dioxide to form methane. The methanation rate in the H 2–CO–CO 2 mixed gas is higher than that in H 2–CO mixed gas without CO 2. This is probably related to the prevention of the formation of surface carbon by the disproportionation reaction of carbon monoxide due to the presence of carbon dioxide. The activity of the Ni–40Zr catalyst at 573 K gradually decreases with reaction time. It has been found that tetragonal ZrO 2, the presence of which is responsible for the high activity, is transformed to thermodynamically more stable monoclinic ZrO 2 during the catalytic reaction. In contrast to the Ni–40Zr catalyst, the Ni–30Zr–10Sm catalyst sustains the initial high activity, and no structural change is observed during the durability test regardless of the presence of a small amount of hydrogen sulfide.

Crystals and nanocrystals in rapidly solidified AlSm alloys

The formation, size and morphology of crystals in Al 100−xSm x (8<x<12) alloys either melt spun or crystallized from the glass was analyzed with SEM, AFM, TEM, DSC, XPS, SIMS. AFM and SEM show crytalline fractions even in some ribbons appearing amorphous at XRD. On the surface which was in contact with the wheel, colonies of crystals were found, apparently nucleated on heterogeneities. In Al 92Sm 8 they were identified as a-Al, inAl 88Sm 12 and Al 90Sm 10 as Al 11Sm 3. On the opposite surface ofAl 92Sm 8 ribbons, AFM reveals crytals of 100–200 nm, regularly distributed, nucleated in the undercooling regime. In glass samples annealed between 423 K and 444 K, TEM shows nanocrystals reaching a density of 10 22 m −3 in less than a minute with maximum size of 20 nm. The isothermal transformed fraction indicates a two step process of crystallization. The findings are discussed considering nucleation in various temperature ranges.

Hard magnets based on transition metal complexes with the dicyanamide anion, {N(CN)2}-,

We present the crystal structures and magnetic properties of a series of magnetic compounds, MII{N(CN)2}2, where M=Cu (1), Ni (2), Co (3) and Fe (4), and [Mn{N(CN)2}2(C2H5OH)2]Z·(CH3)2CO (5). In the isostructural compounds 1–4, the dicyanamide anion is triply coordinating through its three nitrogen atoms. It bridges the metal ions to form infinite 3D metal-organic frameworks with a rutile-type structure. The framework contains doubly bridged M(–Nâ–·C–N–Câ–·N–)2 ribbons that link approximately orthogonally through the amide nitrogen atoms. The Jahn–Teller distortion in 1 has a strong influence on the packing arrangement (M–N bond lengths: 1.98 and 2.47 A for 1 and 2.10 and 2.15 A for 3). On lowering the temperature the bond distances in 1 remain unchanged except for a decrease of the M–Namide length to 2.45 A. Magnetic data for 1 obey the Curie–Weiss law (Θ=-2.1 K). 2 and 3 are ferromagnets with Curie temperatures (TC) of 9 and 21 K and are characterized by hysteresis loops of 710 and 7975 Oe at 2 K, remnant magnetization, magnetization approaching the expected saturation (gS) of 2 and 3 µB in high field, absorptive component (χ″) in the AC magnetization and λ peak in the heat capacity data. 4 is similarly characterized and shows behaviour that is characteristic of a canted antiferromagnet: the Weiss constant is temperature dependent (+3 K in the range 200–300 K), there is a sharper peak than for 1 or 2 in the AC magnetization and the isothermal magnetization at 3 K increases monotonically to ≈1.3 µB (expected to be 4 µB for ferromagnetic alignment of the spins) in a field of 8 T. Its coercive field (17800 Oe) is the largest observed for any metal-organic compound and exceeds those of alloys of SmCo5 and Nd2Fe14B. The maximum energy product (B · H) is the highest for 3 and is comparable to alloys of Sm–Co. We attribute the large coercive field to a combination of single ion and particle shape anisotropies. 5 is paramagnetic at high temperature with Θ=-3 K. Below 16 K it behaves as a canted antiferromagnet with a very weak resultant spontaneous magnetization.

Calorimetric investigation on the PbSm and SnSm alloys

The integral enthalpy of formation of the SmPb and SmSn melts at 1203 K, h f , was determined by direct reaction calorimetry (drop method) in the Pb and Sn rich sides with the help of a high-temperature Tian-Calvet calorimeter. The results can be fitted respectively with reference to the mole fraction of samarium, x, as follows: h f kJ mol −1=x(1−x)(−109.8−372.0.7x) with0 > X Sm >0.27 and h f kJ mol −1=x(1−x)(−277.0−105.4.x) with0> X Sm >0.27 for the SmPb and SmSn melts respectively. They yield the following partial enthalpies of samarium at infinite dilution: −109.8 and −277.0 kJ mol −1 respectively. Such negative values suggest the existence of a strong short-range order in the liquid state. The stoichiometry and the thermal stability of these associations needs additional thermodynamic determinations concerning mainly the free enthalpy of formation. It will be determined by Knudsen-effusion combined with mass spetrometry in a further work.

Anodic film formation on a sputter-deposited amorphous Al–40 at. % Sm alloy

The mechanism of ionic transport in the amorphous anodic film formed on Al–40 at.% Sm alloy has been examined by transmission electron microscopy and Rutherford backscattering spectroscopy. The film consists of an outer layer, about 6% of the total film thickness, composed of relatively pure Sm2O3 and an inner layer containing units of Al2O3 and Sm2O3 distributed homogeneously at the available resolution. The anodic film material is formed by migration of O2−/OH− ions inward and migration of cations outward, with a cation transport number about 0.29. The two-layered film develops as a consequence of faster migration of Sm3+ ions than Al3+ ions in the film.

Magnetic and Transport Properties of Micron Size Magnetic Participate Arrays Fabricated on a 2D Superconducting Nb Films and Sub-Micron Magnetic Wires

ABSTRACTMicron size particulate arrays of amorphous R-Co (R = Sm and Gd) alloys with a thickness of 200 nm were fabricated on top of a 20 nm thick Nb film by means of e-beam lithography and sputter deposition. The arrays consist of 2 × 2 μm2 square particles with a spatial periodicity of 4 μm along an edge of the square. Interesting oscillations due to the fluxoid quantization were observed both in the transition lines and the magnetization curves of the underlying Nb film. The superconducting state of the Nb film was found to be modulated by stray fields of the square magnetic particles.Sub-micron size ferromagnetic Fe wires were also prepared in order to investigate the magnetoresistance effect associated with pinning and depinning processes of a magnetic domain wall confined in the wire. Low temperature transport, Lorentz microscopy and electron holography measurements demonstrated a clear change in resistivity associated with the depinning of a pinned single domain wall.

AlSm and AlDy alloy thin films with low resistivity and high thermal stability for microelectronic conductor lines

The addition of either Sm or Dy rare earth metal elements to Al thin films decreases markedly the grain size of the Al matrix and largely suppresses the growth of hillock and whisker thermal defects at high temperatures (350–450°C). A large number of particles of fine metallic compounds of Al 3RE (RESm or Dy) were segregated in an Al matrix, mostly at grain boundaries, after annealing at 350°C. The resistivities of the films after annealing at the above temperatures show very low values of less than about 50 nμ m, without salient formation of hillocks or whiskers on the film surfaces.

Standard enthalpies of formation of some carbides, silicides, germanides and stannides of samarium by high temperature direct synthesis calorimetry

The standard enthalpies of formation of some samarium alloys in the binary systems SmX (where X = C, Si, Ge, Sn) have been determined by direct synthesis calorimetry at 1273±2 K. The following values of ΔH° 1 (kJ mol −1 of atoms) are reported; SmC 2 = −25.7 ± 1.1; SmSi = −79.7 ± 2.9; SmSi 2 = −66.3 ± 1.6; Sm 5Si 3 = −67.1 ± 2.5; Sm 5Ge 3 = −90.8 ± 2.0; Sm 5 Sn 3 = − 77.9 ± 2.0. In addition to the Sm alloys, the enthalpies of formation of some non-congruently melting rare earth silicides of earlier lanthanide elements have also been determined to complete our systematic survey. The following values of ΔH° f (kJ mol −1 of atoms) are reported: LaSi = −73.9 ± 2.7; La 5Si 3 = −60.1 ± 2.6; La 3Si 2 = −61.6 ± 1.6; Ce 5Si 3 = −52.8 ± 0.6; Pr 5Si 3 = −67.6 ± 2.1; Nd 5Si 3 = −62.3 ± 1.9. These values were measured at 1473 K. The results are compared with some earlier experimental data, with available calorimetric values for the corresponding compounds of other lanthanide elements, and with predicted values from the semi-empirical model of Miedema and coworkers. We will also test the possible correlation between the enthalpies of formation and the changes in the relative volumes of the compounds as suggested by Gschneidner.

Formation Range and Thermal Stability of Cu-rich Cu&ndash;Mg&ndash;Ln (Ln=La, Sm, Eu, Tb, Er or Lu) Amorphous Alloys Tinged with Gold Color

Cu-rich amorphous alloys with Cu concentrations above 80 at% were formed in melt-spun Cu–Mg–Ln (Ln=La, Sm, Tb, Er or Lu) alloys. The amorphous alloys containing more than 84 at%Cu exhibit a gold-like color with high glossiness of about 450%. The glossiness decreases to about 78% by the precipitation of a crystalline phase in the amorphous phase. The Cu-rich amorphous alloys are formed in wider composition ranges for the alloys containing the Ln (Ln=Ce, Pr, Nd, Sm, Gd, Tb, Dy or Ho) elements with intermediate atomic radii of 0.175 to 0.183 nm. The formation of the Cu-rich amorphous alloys is attributed to the simultaneous dissolution of the three elements with significantly different atomic size ratios and large negative heats of mixing. The crystallization temperature (Tx) is in the range of 490 to 602 K and there is a tendency for Tx to decrease with increasing atomic number, i.e., with decreasing atomic radius of the Ln elements. The finding of the Cu-rich amorphous alloys with the gold-like color and high glossiness is important for future development of Cu-rich amorphous alloys as an engineering material.

Effect of W Addition on the Martensitic Transformation and Shape Memory Behaviour of the TiNi-Base Alloys

The effect of W addition on the martensitic transformation (MT) and SM effect, especially reversible shape memory(two way shape memory) effect of the TiNi base alloys was investigated. It was found that addition of W in the TiNi and TiNi-Cu SM alloys does not affect essentially MT itself. Transformation temperatures slightly decrease with increasing W content (3 to 5K/at%W) and transformation hysteresis does not widen. By measuring change in bending strain above and below Af and Ms of the specimen of W added alloys showed that quite clear RSM effect is obtained even in the specimen slightly deformed by simple bending with bending strain 0.05 below Ms. It was found that W is less soluble in the TiNi matrix and makes fine particles with the size around 20 microns by EPMA analysis. It is expected that fine and hard W precipitates would make the origin of strain field for MT during the 2nd and further heating and cooling cycle. It is thus quite hopeful to develope TiNi alloys with good RSM effect by using these W added alloys.

超微細加工技術の磁性薄膜への応用 強磁性体微粒子格子の性質

Two dimensional arrays of amorphous R-Co (R = Sm and Gd) alloys or Fe, Ni, alloys with thickness around 200 urn were prepared on top of a 20 nm thick niobium film by means of a-beam lithography and sputter deposition. The arrays consist of 2×2μm2 square particles with spatial periodicity ranging from 4 to 8 μm along the edge of the squre. Demagnetizing processes, magneto optical properties and transport properties were studied. The demagnetization curves appeared strongly different from those of bulk films with no pattern. The obtained curves were compared to those predicted by computor simulation. Calculations show that the evolution of dipolar fields leads to successive reversal of the particles column by column. When these arrays were illuminated by a laser beam, a set of Bragg reflections was observed. The obtained diffraction hysteresis loops were found to yield novel information about the domain structure on a submicron scale. Interesting oscillations due to the fluxoid quantization were observed in the transition lines of underlying Nb films. The superconducting state of the Nb is modulated by stray fields by the square magnetic particles.

Hydrogenation and X-ray diffraction study of microstresses in Pd alloys

X-ray diffraction profiles from different concentrations of Pd, PdPt, PdCu, PdSm, PdRu and PdHf alloys have been recorded for cold-worked, annealed and hydrogenated states. Using the peak shift, the relationship between the values of microstresses and the concentrations of added elements as well as the values of r Pd r ad have been observed.

Structural and magnetic properties of mechanically alloyed Smx( Fe1− yCoy) 100− x nitrides

Structural and magnetic properties of mechanically alloyed (MA) samples of Sm x (Fe 1− y Co y ) 100− x N δ have been studied systematically. At y = 0, SmFe 7N δ phase with hexagonal TbCu 7 structure forms between compositions of x = 11 and 15, while α-Fe is easily generated for x < 11. For x > 15, SmFe 7N δ phase can not be found. The magnetic properties of the samples with x = 12.5, annealed at 750°C for 30 min and nitrided at 500°C for 3 h, reach maxima. For the alloys of Sm x (Fe 1− y Co y ) 100− x N δ , it is found that the quantity of N atoms in the samples decreases with increasing Co content ( y value), leading to the reduction of the magnetic properties (with exception of Curie temperature) of the samples. For the samples with y > 0.8, the structure of the sample is of rhombohedral Th 2Zn 17 type. In this work, N atoms cannot be introduced into the lattice of the samples with y = 1 and, therefore, their intrinsic magnetic properties are not improved by nitriding.

X-Ray Magnetic Circular Dichroism in Crystalline and Amorphous Fe–Dy Alloys

X-ray magnetic circular dichroism has been studied on the crystalline and amorphous 80at%Fe-R(R=Sm,Gd,Tb and Dy) alloys. The dichroic spectrum at the Fe K-edge suggests that Fe 4p-bands hybridize with unoccupied bands of rare-earth. The intensity ratio between the XMCD spectra at the R L2- and L3-edges deviates from the ratio 1:-1 theoretically expected, which indicates a non-vanishing orbital angular momentum.

Magnetic hysteresis in Fe-rich rare-earth amorphous alloys

We investigate the hysteresis behavior of R 15Fe 77B 8 amorphous alloys with R = Sm, Tb, Dy and Er in the temperature range 4.2–250 K and their — extrapolated to T = 0 K — coercive fields in the light of some existing models. A small-fluctuations model does not explain the H c values at T = 0 K and a large-fluctuations model seems to be more appropriate. A strong domain-wall pinning exists in the Tb alloy in the temperature range studied, yet a domain-wall diffusion model fairly works up to ≈ 100 K in this alloy. This same model works better for the Sm alloy up to 250 K with a domain-wall thickness of about one lattice spacing.

Thermal expansion and velocity of sound of GdSm alloys through the magnetic transition temperatures

Measurements of the thermal expansion and velocity of sound of Gd 80Sm 20, Gd 65Sm 35 and Gd 20Sm 80 through the magnetic phase transitions indicate that an antiferromagnetic-to-paramagnetic transition exists in Gd 20Sm 80 in contrast to a recent finding that the ferromagnetic influence of Gd still exists in this alloy.

Formation of Compounds and Their Magnetic Properties of Rapidly Quenched (Fe1-xCox)4.5(Ni,Al)0.5Sm Alloys

The formation and magnetic properties of CaCu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> -, Th <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Zn <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">17</sub> - and PuNi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> -type compounds in (Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</sub> Co <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4.5</sub> Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.5</sub> Sm and (Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</sub> Co <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4.5</sub> Ni <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.5</sub> Sm alloys, rapid-quenched at disk velocities ranging from 8.4 to 41.9 m/s, were investigated. The CaCu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> -type (Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</sub> Co <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4.5</sub> (Ni,Al) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.5</sub> SM compounds were formed in the composition range 0.6≤×≤1.0 The formation range is the same as when Al and Ni are not added. The difference resulting from addition of Al and Ni is that CaCu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> -type compounds can be formed at lower disk velocities, indicating increased stability of the compound. Its unit cell volume does not change with the addition of Al and Ni. On the other hand, the unit cell volume of (Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</sub> Co <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">17</sub> Sm <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">δ</sub> and (Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</sub> Co <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">17</sub> Sm <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Ni <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">δ (x≤0.6) compounds increases by 2 to 4% and by 1 to 2% respectively. The particularly large increase in the unit cell volume of the former is believed to raise the Curie temperature and the coercivity.</sub>

Some magnetic properties of as-cast Re4Fe1 (Re=Pr,Nd,Sm) alloys and corresponding hydrogen-rich phases (abstract)

The aim of this work is to discuss some magnetic data of as-cast Re4Fe1 alloys (Re=Nd,Pr,Sm) as well as to study the influence of hydrogen absorption on their structural and magnetic properties. The pallets of 1 g were prepared by arc melting Nd,Pr,Sm, and Fe (purity 99.9%) under Ar. Structural analyses were performed using a standard x-ray diffractometer. The high-temperature magnetization was studied by a vibrating sample magnetometer in the temperature range of 300–1200 K and permanent magnetic fields up to 7 kOe. The high-field magnetization studies in fields up to 140 kOe in the temperature range from 4.2 to 300 K were performed by an extraction magnetometer. The hydrogen absorption processes were studied by a volumetric apparatus within the hydrogen pressure range of 10–4×103 kPa in the temperature range of 270–573 K. The x-ray and the magnetic measurements were performed on the samples of alloys and hydrides with H concentration of 2.8 at. %/mol. x-ray diffractograms for parent Re4Fe1 alloys showed the presence of two allotrope-hexagonal P6mmc and cubic structures. The existence of a small amount of amorphous phase cannot also be excluded. X-ray patterns of Re4Fe1H2.7 (Re=Pr, Nd) showed well-defined first and second diffuse haloes and the presence of some smeared diffraction peaks corresponding to the bcc structure, typical for Re-H3 systems. Magnetic ordering temperatures were determined to be 515 and 502 K for Nd4Fe1 and Pr4Fe1, respectively. Formation of the hydride phases results in decreasing of the coercivity Hc. At room temperatures Hc was found to be 4.5 kOe and 60 Oe for as-cast Nd4Fe1 and its hydride, respectively. It should be noted that absorption of hydrogen increases the net magnetic moment. A strong thermomagnetic effect was observed in the magnetic fields up to 60 kOe for the alloys. In the case of zero-field cooling of the Nd4Fe1 sample the value of magnetization at 25 kOe is 3.4 μB/mol (4.2 K) and 5.0 μB/mol when the sample is cooling in the same field. The last observation as well as the presence of a minimum in the temperature dependence of magnetization around T=60 K at a field 25 kOe for Nd4Fe1 and Pr4Fe1 showed the strong influence of the anisotropy on the magnetic moments of the iron sublattice.

液体急冷（Ｆｅ１−ｘＣｏｘ）４．５（Ｎｉ，Ａｌ）０．５Ｓｍ合金の生成相と磁気特性

The formation and magnetic properties of CaCu5, Th2Zn17 and PuNi3 type compounds were investigated for (Fe1-xCox)4.5Al0.5Sm and (Fe1-xCox)4.5Ni0.5Sm alloys rapidly-quenched at various disk velocities ranging from 8.4 to 41.9 m/s. The CaCu5 type (Fe1-xCox)4.5(Al, Ni)0.5Sm compounds were formed in the composition range 0.6≤x≤1.0. The formation range is the same as that without addition of Al and Ni. The different point due to the addition of Al and Ni is that the CaCu5 type compound can be formed at lower disk velocities, indicating the increased stability of the compound. Its unit cell volume does not change with the addition of Al and Ni. On the other hand, the unit cell volume of (Fe1-xCox)17Sm2Alδand (Fe1-xCox)17Sm2Niδ(x≤0.6) compounds increases 2∼4% and 1∼2%, respectively. The particular large increase of the unit cell volume of (Fe1-xCox)17Sm2Alδ is considered to enhance the Curie temperature and the coercivity.