Constitution diagram of the gadolinium-germanium system

Eremenko, V. N.; Batalin, V. G.; Buyanov, Yu. I.; Obushenko, I. M.

doi:10.1007/bf00792035

Cited by 19 publications

(30 citation statements)

References 7 publications

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“…In the temperature range 2220-2262 K, the enthalpy of Er 5 Ge 3 incrementally increases (Table 1) due to its congruent melting according to [3]. The melting point determined as the average for the specified range, taking into account the error of its measurement with an optical pyrometer (0.8%), is 2241 ± 40 K and agrees well with the value (2223 K) reported in [3].…”

Section: Experimental Procedures and Resultssupporting

confidence: 79%

“…Germanide Er 5 Ge 3 is the most refractory compound that congruently melts at 2223 K in the Er-Ge system with a homogeneity range at about 1 at.% [3]. The standard formation enthalpy of Er 5 Ge 3 determined with hightemperature calorimetry [4] is -95.6 ± 2.0 kJ/g-at and well agrees with the value obtained with the e.m.f.…”

Section: Introductionsupporting

confidence: 62%

“…The survey was carried out in fixed Cu-K α radiation at an x-ray tube current of 30 mA and with a scanning angle/point exposure ratio of 0.03º/5 sec. The phases were identified by comparing the experimental diffraction patterns and theoretical ones plotted by the Powder Cell [9] and Poudrix [10] software using the crystallographic data reported in [11,12] and [3]. The x-ray diffraction showed* that the smelted alloy contained one phase, belonged to the Mn 5 Si 3 structural type of hexagonal syngony, and had lattice parameters a = 0.8351 nm and c = 0.6269 nm.…”

Section: Characteristic Of the Samplementioning

confidence: 99%

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Thermodynamic characteristics of Er5Ge3 at high temperatures

Gorbachuk

2011

Powder Metall Met Ceram

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Section: Experimental Procedures and Resultssupporting

confidence: 79%

Section: Introductionsupporting

confidence: 62%

Section: Characteristic Of the Samplementioning

confidence: 99%

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Thermodynamic characteristics of Er5Ge3 at high temperatures

Gorbachuk

2011

Powder Metall Met Ceram

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“…For these elements, only the compounds with compositions of LnGe x with x¯2 have been reported by reactions under ambient pressure. However, in our recent studies, Ge rich compounds were obtained by high-pressure and high-temperature reactions, such as LnGe 5 , Ln = La, Ce, Pr, Nd, and Sm with the LaGe 5 structure, and CeGe 3 with the Cu 3 Au structure. 79 The former has a tunnel structure composed of GeGe covalent network containing uncommon 8-coordinated Ge atoms.…”

Section: +mentioning

confidence: 99%

Preparation and Structures of Lanthanoid Germanides, PrGe3.36, NdGe3.25, and TmGe3 with Double Square Ge-Mesh Structures

Fukuoka¹,

Yoshikawa²,

Baba³

et al. 2010

Bulletin of the Chemical Society of Japan

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A series of lanthanoid trigermanides of Pr, Nd, and Tm has been prepared by high-pressure (35 GPa) and hightemperature (1200°C) reactions. TmGe 3 crystallizes in an orthorhombic unit cell (Cmcm, No. 63) with a = 3.990(1) ¡, b = 20.488(5) ¡, c = 3.8794(8) ¡, and V = 317.2(1) ¡ 3. It is isotypic with the DyGe 3 structure composed of Ge zig-zag chains and Tm situated between double square Ge-meshes. PrGe 3.36 crystallizes in an orthorhombic unit cell (Cmmm, No. 65) with a = 4.062(4) ¡, b = 21.43(3) ¡, c = 4.212(6) ¡, and V = 366.6(8) ¡ 3 . The structure is principally the same to the DyGe 3 structure but contains an additional Ge site. The site is partially occupied, and is situated on the square mesh. Each Ge atom in the site is coordinated by five Ge atoms in the chain and in the mesh. , Tb 3+ , and Gd 3+ form the DyGe 3 structure. 16 The structure contains two types of Ge subunits as shown in Figure 1.1 One is a zig-zag chain and the other is a layer composed of double square meshes. Dy ions and the Ge chains are situated between the layers. The space group is Cmcm and the double meshes are stacked along the b axis. The chains extend along the c axis corresponding to the diagonal direction of the meshes. The lattice constants of the a (4.0278(5) ¡) and c (3.8997(5) ¡) axes of DyGe 3 are very similar but not the same, because the mesh is slightly distorted from the regular square net.Light lanthanoid elements do not form the DyGe 3 structure. For these elements, only the compounds with compositions of LnGe x with x¯2 have been reported by reactions under ambient pressure. However, in our recent studies, Ge rich compounds were obtained by high-pressure and high-temperature reactions, such as LnGe 5 , Ln = La, Ce, Pr, Nd, and Sm with the LaGe 5 structure, and CeGe 3 with the Cu 3 Au structure. 79 The former has a tunnel structure composed of GeGe covalent network containing uncommon 8-coordinated Ge atoms.We are interested in the structures of Ge networks in lanthanoid germanides formed under high pressure. In the present study, we have investigated the reactions of Pr, Nd, and Tm with Ge and successfully prepared three new germanides PrGe 3.36 , NdGe 3.25 , and TmGe 3 with the aid of high-pressure and high-temperature conditions. They have the DyGe 3 structure (for Tm), and its closely related structures (for Pr and Nd). ExperimentalThe new lanthanoid germanides were prepared as follows: Pr (Nilaco 99.9%) and Tm (Nilaco 99.7%) were reacted with Ge (Mitsuwa Pure Chemical 99.999%) in a molar ratio of 1:3 in an arc Figure 1. The crystal structure of DyGe 3 . The yellow and green balls represent Dy and Ge atoms, respectively. It has a layer structure composed of Dy 3+ ions, double square Ge-meshes, and Ge-chains.

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“…Magnetic and electrical properties of the binary system have also been extensively studied [5]. In the binary system there are six ferromagnetic compounds showing different Curie temperatures (T C ): Pr 5 Si 3 (T C ¼42-44 K) [5][6][7], Pr 5 Si 4 (T C ¼ 40 K) [5], PrSi (T C ¼51-54 K) [5,8], Pr 3 Si 4 (T C ¼ 100-105 K) [5,9], Pr 3 Si 5 (T C ¼ 11.5 K) [10] and PrSi 2 (T C ¼11.5 K) [11], as well as one antiferromagnetic compound, PrSi 2−x (x¼ 0.12), with the Neel temperature T N ¼11 K [5].…”

Section: Introductionmentioning

confidence: 99%

Magnetism and the absence of superconductivity in the praseodymium–silicon system doped with carbon and boron

Venta

Basaran

Grant

et al. 2013

Journal of Magnetism and Magnetic Materials

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Keywords:Rare earth compound Praseodymium silicide Magnetism and superconductivity search for new phase High-pressure high temperature a b s t r a c tWe searched for new structural, magnetic and superconductivity phases in the Pr-Si system using highpressure high-temperature and arc melting syntheses. Both high and low Si concentration areas of the phase diagram were explored. Although a similar approach in the La-Si system produced new stable superconducting phases, in the Pr-Si system we did not find any new superconductors. At low Si concentrations, the arc-melted samples were doped with C or B. It was found that addition of C gave rise to multiple previously unknown ferromagnetic phases. Furthermore, X-ray refinement of the undoped samples confirmed the existence of the so far elusive Pr 3 Si 2 phase.

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Constitution diagram of the gadolinium-germanium system

Cited by 19 publications

References 7 publications

Thermodynamic characteristics of Er5Ge3 at high temperatures

Thermodynamic characteristics of Er5Ge3 at high temperatures

Preparation and Structures of Lanthanoid Germanides, PrGe3.36, NdGe3.25, and TmGe3 with Double Square Ge-Mesh Structures

Magnetism and the absence of superconductivity in the praseodymium–silicon system doped with carbon and boron

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