58221-30-0Relevant academic research and scientific papers
HIGH-TEMPERATURE OXIDATION OF ZrAl.
Paljevic M.
, p. 107 - 112 (1988)
The oxidation of ZrAl in dry oxygen in the temperature range 800 - 1100 K follows a parabolic rate law. An activation energy of 86. 4 kJ mol** minus **1 was estimated. During the oxidation, aluminum diffuses from the oxide layer to the ZrAl bulk, thus forming a ZrAl//2 phase very close to the oxide-alloy interface. The excess zirconium is therefore selectively oxidized, yielding tetragonal mainly and monoclinic ZrO//2 containing no Al//2O//3.
Zr4Al3D2.68 and Zr3Al2D2.26: New Zr-containing intermetallic hydrides with ordered hydrogen sublattice
Riabov,Yartys,Denys,Hauback
, p. 91 - 95 (2003)
Two hydrogenated intermetallics with the highest Al/Zr ratio among the hydrogen-absorbing Zr-Al compounds, Zr4Al3 and Zr3Al2, have been studied by synchrotron X-ray, powder neutron diffraction and thermal desorption spectroscopy. Initial intermetallic compounds are quite different with respect to Al-Al interactions and contain plain Kagome Al nets (Zr4Al3) or Al-Al pairs (Zr3Al2). In hexagonal Zr4Al3D2.68 (space group (s.g.) P6322; a = 11.0017(4); c = 11.1694(5) ?) a 2a×2a×2c superstructure is formed as a result of deuterium ordering in half of the available Zr4 tetrahedra. These tetrahedra share common corners and edges and form layers separated by 6363 Al-nets. In tetragonal Zr3Al2D2.26 (s.g. P42/mnm; a = 7.5970(3); c = 7.2613(3) ?) in addition to the completely filled Zr4 tetrahedra hydrogen partially occupies Zr3 triangular sites. Thermal stability of the studied deuterides and Zr-D bonding characteristics can be related to the size of the occupied Zr4 tetrahedra. Higher thermal stability of Zr3Al2D2.26 agrees well with the existence of large Zr4 sites and contrasts to the behavior of Zr4Al3D2.68 containing 'contracted' Zr4 tetrahedra and having weaker Zr-D bonds.
Phase equilibria in the ternary Al-Zr-La system
Peng, Dan,Zhan, Yongzhong,She, Jia,Pang, Mingjun,Du, Yong
, p. 62 - 66 (2011/01/09)
The phase relationships in the Al-Zr-La ternary system at 773 K have been investigated for the first time mainly by means of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive analysis (EDX). The existenc
