Phase Diagrams of the Ln—Al—{Si,Ge} Systems

Melnyk, Igor; Pikus, S.; SEMUSO, Nataliya; Gladyshevskii, R.

doi:10.1002/chin.200513244

Cited by 5 publications

(7 citation statements)

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“…Ізоструктурні сполуки утворюються у системах Hf-Al і Hf-Si: сполуки Hf 2 Al і Hf 2 Si мають структуру типу CuAl 2 (tI12, I4/mcm); у системах Tb-Si і Hf-Si: моносиліциди TbSi та HfSi мають структуру типу FeB (oP8, Pnma), а за співвідношення компонентів 5:3 реалізується гексагональна структура типу Mn 5 Si 3 (hP16, P6 3 /mcm); у системах Tb-Al та Hf-Al: сполуки Tb 3 Al 2 та Hf 3 Al 2 мають структуру типу Zr 3 Al 2 (tP20, P4 2 /mmm). ______________________  Муць Н., Маланчук І., Токайчук Я., Гладишевський Р., 2022 У потрійних системах Tb-Hf-Al [5], Tb-Hf-Si [6], Tb-Al-Si [7] та Hf-Al-Si [4], що обмежують досліджувану систему Tb-Hf-Al-Si, існують 18 тернарних сполук. Сполуки системи Tb-Al-Si (TbAl 2,76-2,60 Si 0,24-0,40 і TbAl 1,05-0,99 Si 0,95-1,01 ) мають області гомогенності.…”

Section: вступunclassified

The Tb‒Hf‒Al‒Si system (600 C)

Muts¹,

Malanchuk²,

Tokaychuk³

et al. 2022

Visnyk Lviv Univ. Ser. Chem.

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Сплави системи Tb-Hf-Al-Si, відпалені за температури 600 °С, досліджено методами рентгенівських фазового та структурного аналізів і флюоресцентної та енергодисперсійної спектроскопій. Визначено існування тетрарної фази складу (Tb 0,74 Hf 0,26 )(Al 0,48 Si 0,52 ) з ромбічною структурою типу TlI: символ Пірсона oS8, просторова група Cmcm, a = 4,312(1), b = 10,793(3), c = 3,973(1) Å. У системі Tb-Hf-Al-Si також утворюються тверді розчини заміщення на основі окремих бінарних і тернарних фаз. Розчинність інших двох компонентів у бінарній сполуці Hf 5 Si 3 (структурний тип Mn 5 Si 3 , символ Пірсона hP16, просторова група P6 3 /mcm) становить 10 ат. % Tb та 7 ат.% Al ((Tb 0,16 Hf 0,84 ) 5 (Al 0,19 Si 0,81 ) 3 ). Тербій диалюмінід TbAl 2 (MgCu 2 , cF24, Fd-3m) максимально розчиняє 7 ат. % Si ((Tb 0,94 Hf 0,06 )(Al 0,90 Si 0,10 ) 2 ). Сполука еквіатомного складу TbAl (DyAl, oP16, Pbcm) розчиняє до 8 ат.% Hf та 5 ат. % Si ((Tb 0,85 Hf 0,15 )(Al 0,89 Si 0,11 )), а гафній силіцид HfSi зі структурою типу FeB (oP8, Pnma) розчиняє до 9 ат.% Tb та 7 ат. % Al ((Tb 0,17 Hf 0,83 )(Al 0,15 Si 0,85 )). Максимальна розчинність алюмінію в тернарній сполуці Tb 2 Hf 3 Si 4 (Sc 2 Re 3 Si 4 , tP36, P4 1 2 1 2) становить 18 ат. % (Tb 2,4 Hf 2,6 (Al 0,42 Si 0,58 ) 4 ).

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Section: вступunclassified

The Tb‒Hf‒Al‒Si system (600 C)

Muts¹,

Malanchuk²,

Tokaychuk³

et al. 2022

Visnyk Lviv Univ. Ser. Chem.

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“…The latter two alumogermanides are characterized by significant homogeneity ranges (PrAl 1.55-1.48 Ge 0.45-0.52 and PrAl 1.42-0.98 Ge 0.58-1.02 ). In other R-Al-Ge systems, where R = La, Ce, Nd, Sm, Eu, and Gd, compounds isotypic to those mentioned above are formed [6][7][8]. To date, the Pr-rich part of the Pr-Al-Ge system has not been investigated and the aim of the present work is to study the formation of phases in the system in the range 33.3-45.0 at.% Pr, determine their crystal structures and search for isotypic compounds in related systems.…”

Section: Introductionmentioning

confidence: 97%

Pr4Al3Ge3, a new member of the structural series with linear intergrowth of AlB2- and W-type slabs

Gladyshevskii¹,

SEMUSO²,

Gladyshevskii³

et al. 2008

Chem. Met. Alloys

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The structure of praseodymium aluminum germanide Pr 4 Al 3 Ge 3 has been determined by single-crystal X-ray diffraction. The refined composition is Pr 4 Al 3.117(3) Ge 2.883(3) , M r = 857.01(8), oS20, (63) Cmcm-c 5 , a = 4.161(1), b = 26.261(8), c = 4.373(1) Å, Z = 2, D x = 5.96 Mg m-3 , R = 0.012, wR = 0.015 for 304 independent reflections with F > 3σ(F). Four sites in Wyckoff position 4c are occupied by Pr(1), Pr(2), Al, and Ge, respectively, and a fifth position 4c by a statistical mixture of Al and Ge with a ratio close to 1:1. The compound is characterized by a homogeneity range extending from 26.6 to 30.6 at.% Ge at a constant Pr content of 40 at.%. Isotypic compounds have been found for R 4 Al 3 Ge 3 , where R = Ce, Nd, or Sm. This new structure type can be considered as an intergrowth of slabs cut from three simple structure types: AlB 2 , its ternary substitution variant LiBaSi, and W, following the sequence-LiBaSi-AlB 2-LiBaSi-W-, with eight slabs in the translation unit. The axes of the trigonal prisms in the AlB 2-type slab are rotated by 90° with respect to those in the neighboring LiBaSi-type slabs, as in the α α α α-ThSi 2 type and the intergrowth structure TbGe 2. The structure of Pr 4 Al 3 Ge 3 is also related to the structures of binary borides V 2 B 3 , Ta 3 B 4 , V 5 B 6 , and CrB, and the ternary aluminum germanide Ba 3 Al 2 Ge 2 , which altogether form a structural series with different ratios of intergrown AlB 2-(LiBaSi-) and W-type slabs. Alumogermanide / Rare-earth metal / Single-crystal X-ray diffraction / Crystal structure / Structural series

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“…In this work we present the results of a structural investigation of the ternary alumosilicide HoAl 2.8 Si 0.2 . The existence of several ternary compounds has been reported in the Ho-Al-Si system [2,[12][13][14] (Table 2). The compositions of the compounds reported as ~HoAl 2 Si (M phase) and ~Ho 35 Al 30 Si 35 (K phase) were later corrected to Ho 2 Al 3 Si 2 and HoAlSi, respectively, whereas ~Ho 37.5 Al 32.5 Si 30 (T phase) may represent the compound Ho 2 Al 2 Si.…”

Section: Introductionmentioning

confidence: 99%

The alumosilicide HoAl2.8Si0.2

Pukas¹,

Gladyshevskii²

2013

Chem. Met. Alloys

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The holmium alumosilicide HoAl 2.8 Si 0.2 was synthesized by arc melting and subsequent annealing at 600ºC. Its crystal structure was studied by X-ray powder diffraction and identified as BaPb 3 type: Pearson symbol hR36, space group R-3m, a = 6.12537(7), c = 20.9526(3) Å. The structure is close-packed and consists of oneatom thick close-packed layers of composition Ho(Al,Si) 3 in h 2 c stacking, with 9 layers in the translation period along [001]. The coordination polyhedra are cuboctahedra (sites Ho2 and M2) and anticuboctahedra (sites Ho1 and M1). For the Ho atoms the coordination polyhedra are built up exclusively of Al/Si atoms, whereas for the latter the composition of the polyhedra is Ho 4 M 8 .

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Phase Diagrams of the Ln—Al—{Si,Ge} Systems

Abstract: For Abstract see ChemInform Abstract in Full Text.

Cited by 5 publications

References 0 publications

The Tb‒Hf‒Al‒Si system (600 C)

The Tb‒Hf‒Al‒Si system (600 C)

Pr4Al3Ge3, a new member of the structural series with linear intergrowth of AlB2- and W-type slabs

The alumosilicide HoAl2.8Si0.2

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