ARTINI , Cristina

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In this review structural features, stability issues and physical properties of the eleven interlanthanide perovskites prepared at atmospheric pressure are surveyed and discussed. Due to the reduced size difference between cations, the structure of these oxides is strongly distorted with respect to the ideal cubic case. Therefore, in structure...

The synthesis of mixed Gd-Nd oxycarbonates was performed via a solid state route involving the decomposition of mixed oxalates. Depending on the reaction atmosphere, the compounds can form through two different reaction paths: by partial decomposition of the corresponding mixed oxalates or by complete decomposition of the oxalates followed by...

Samples belonging to the series Smy(FexNi1-x)4Sb12 were heated in Ar atmosphere up to 400°C and cooled down to room temperature several times, with the aim to evaluate the effect of thermal cycles on microhardness. The treatment temperature was chosen in correspondence of the maximum ZT value, in order to simulate the operating conditions of...

Orthorhombic LaErO3 and cubic (La0.5 Ln 0.5)2O3 oxides (Ln: Er, Dy) were examined by neutron powder diffraction between 1.5 K and 15 K in order to investigate their crystallographic and magnetic structures. At 1.5 K both LaErO3 and (La0.5Er0.5)2O3 display a magnetic moments ordering, whereas for (La0.5Dy0.5)2O3 only short range magnetic...

Mixed LaREO3 (RE ≡ Dy, Ho, Er, Tm, Yb, Lu) and NdGdO 3 oxides were prepared by thermal decomposition of the corresponding co-precipitated mixed oxalates. The decomposition of La/RE and Nd/Gd oxalates was studied by means of differential thermal analysis and thermogravimetric (DTA-TG) measurements; in particular the last step, consisting of the...

This paper reviews studies undertaken on diamond cutting tools, with particular regard to the characteristics and performance of diamond/metal interfaces. The affinity of carbon to metals, as well as the wettability of diamond by molten metals and the advantage of using coated diamonds under certain cutting conditions, are described. The choice...

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Two different synthetic routes to synthesize the magnetic superconductor RuSr2Gd1.4Ce0.6Cu2O10−ı (Ru- 1222) have been reported as an alternative method to the solid state reaction starting from the oxides of Ru, Gd, Ce, Cu and SrCO3. The 1222-phase has been namely prepared by mixing and reacting proper amounts of: (a) the 1212-phase...

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A stability study of perovskitic LaREO3 oxides (RE = Dy, Ho, Er, Tm, Yb, Lu) as a function of temperature was undertaken. A correlation between the Goldschmidt t value and the perovskitic stability field amplitude was found: the latter widens as t increases. Magnetic measurements, performed on all the perovskitic samples, showed that t is also...

The existence fields of the 11 known interlanthanide perovskites have been assessed as a function of temperature on the basis of experimental and literature data, and studied by means of the bond valence method using the software SPuDS. The role of geometrical factors in driving the enthalpic and entropic contributions to the Gibbs free energy...

The existence of pure cubic Nd2O3 is a debated issue in the literature, as it seems to depend on the nature of the oxide precursors and on the synthesis parameters. In this work, Nd2O3 was produced by Nd oxidation, treating first the metal powders in O2 atmosphere (P=1.05 atm) at lowtemperature (200 and 350 °C) and then heating the resulting...