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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The phase equilibria in the Dy–Cu–Si system were investigated by X-ray powder diffraction and local X-ray spectral analysis; the isothermal cross-section at 1170K was obtained. The following compounds have been confirmed: DyCu2Si2 [CeGa2Al2-type, space group I4/mmm, No. 139, a = 0.3952(1) nm, c = 0.9926(2) nm], DyCu1–0.5Si1–1.5 [AlB2-type, space group P6/mmm, No. 191, a = 0.4151(1)–0.3975(1) nm,c = 0.3700(1)–0.4012(1) nm], DyCuSi [ZrBeSi (Ni2In)-type ordered derived structure, space group P63/mmc, No. 194, a = 0.4153(1) nm,c = 0.7404(1) nm], Dy3Cu11Si4 [Sc3Ni11Si4-type, space group P63/mmc, No. 194, a = 0.8411(1) nm, c = 0.8814(1) nm] and Dy6Cu8Si8 [Gd6Cu8Ge8-type, space group Immm, No. 71, a = 1.3665(1) nm, b = 0.6531(1) nm, c = 0.4127(1) nm]. Both phases DyCu0.5Si1.5 [ThSi2-type, space group
I41/amd, No. 141-2, a = 0.3985(1) nm, c = 1.3757(3) nm] and Dy33Cu63Si4 [CeCu2-type, space group Imma, No. 74, a = 0.4292(1) nm, b = 0.6832(1) nm, c = 0.7297(2) nm] are pertaining to an extended homogeneity region, being these based on the solid solutions presented by the
DySi2 (ThSi2-type) and DyCu2 (CeCu2-type) parent binary compounds, respectively. The substitution of Si for Cu stabilizes the high-temperature hexagonal CaCu5-type modification of the compound DyCu5; for this reason, the CaCu5-type phase Dy17Cu76Si7 (space group P6/mmm, No. 191, a = 0.5004(1) nm, c = 0.4085(1) nm) has been observed in this isothermal section, too.