PALENZONA , Andrea

The phase diagram of the Sr–Si system has been investigated across almost the whole composition range (0–75 at.% Si) using differential thermal analysis (DTA), metallographic analysis, X-ray diffraction and electron microscopy. Four intermediate phases exist: Sr2Si (PbCl2-type), Sr5Si3 (Cr5B3-type), SrSi (CrB-type) and the dimorphic SrSi2...

The phase diagram of the Ba-Si system has been completely revised from a thermal point of view. All the already-known intermediate phases have been confirmed: Ba2Si (Co2Si type), Ba5Si3 (Ba5Si3 type), BaSi (CrB type), Ba3Si4 (Ba3Si4 type) and BaSi2 (BaSi2 type). Save for Ba5Si3, which forms peritectically, all other compounds melt congruently....

The phase diagram of the Yb-Ge system was investigated over the whole compositional range by means of differential thermal analysis (DTA), X-ray diffraction (XRD), optical microscopy (LOM) and electron probe microanalysis (EMPA). Besides the already known intermediate phases Yb2Ge (PbCl2-type), Yb5Ge3 (Mn5Si 3-type), Yb11Ge10 (Ho11Ge 10-type)...

The phasediagram of the Ba–Gesystem has been revised, in the composition range 0–75 at.% Ge, from a thermal point of view, resulting substantially different from that previously reported in Massalski collection. The existence and composition of the following compounds are confirmed: Ba2Ge, Ba5Ge3, BaGe, dimorphic Ba3Ge4, BaGe2, Ba6Ge25 and...

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The intermetallic compounds Yb2Ge, Eu2Ge and Eu2Si were synthesized from the elements by HF melting in tantalum crucibles. The three phases crystallize in the PbCl2 structure type, as shown by Rietveld refinement of powder pattern intensity data. The structure of Yb2Ge was confirmed by a single crystal study.

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The synthesis and crystal structure of the new family of rare earth ternary equiatomic RZnGe phases are reported. The compounds are found to form for R = La to Nd, Sm, Gd to Tm, Y, all crystallizing with the hexagonal hP12-P63/mmc YPtAs structure type, a four-layers superstructure derivative of the AlB2 type. No formation of the equiatomic...

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The synthesis and structural characterization of phases in the R–Li–Ge (R = rare earth) systems are reported. The R4LiGe4 compounds with R = La–Nd, Sm complete the series, where the analogues with R = Gd–Tm, Lu were confirmed, all crystallizing with the Tm4LiGe4 type. Nd4LiGe4 and Ho4LiGe4 were structurally studied by single crystal X-ray...

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The crystal structure of SmFeAs(O0.93F0.07) has been investigated under high pressure (up to 9 GPa) by means of synchrotron powder diffraction analysis followed by Rietveld refinement. The bulk modulus was calculated (K0 = 103 GPa) using a 3rd order Birch–Murnaghan equation of state and resulted in quite good agreement with theoretical...

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