12042-65-8Relevant academic research and scientific papers
Chemical short-range order and the Meyer-Neldel rule for liquid alloys: AlCa and GaAlCa
You,Schnyders,Van Zytveld
, p. 1407 - 1415 (1997)
We have measured the electrical resistivity, ρ, its specific temperature dependence, α = (1/ρ)dρ/dT, and the thermopower, S, of two series of ternary liquid alloys: GaxAl67-xCa33 and GaxAl50-xCa50. We also provide new analysis for the binary liquid alloy AlCa. We do not see the unusually large values for S that were found earlier for amorphous solid ternary alloys of the approximate composition GaxAlyCa60. We do find that, while chemical short-range order (CSRO) appears to occur in the liquid binary alloy Al2Ca, CSRO is apparently destroyed by substitution of one Ga atom for one Al per complex: Ga1Al1Ca1. CSRO may exist in the liquid alloy Ga2Ca. And we find that the activated conductivities of these ternary liquid alloys (and also of liquid AlCa) are consistent with the Meyer-Neldel rule (MNR), extending the range of applicability of the MNR to systems with activation energies about an order of magnitude smaller than previously observed. These results appear to rule out two physical models as universal bases for the MNR, but are consistent with one based on a hopping conductivity whose characteristic energy is that of a polaron shift.
The [17.0] 2Π1/2←X 2Π1/2 system of AlCa
Fabbi, Jacqueline C.,Langenberg, Jon D.,Morse, Michael D.
, p. 303 - 306 (2000)
Laser-induced fluorescence spectroscopy has been used to study supersonically cooled AlCa. This study investigates under higher resolution (0.007 cm-1) a single band previously studied and tentatively assigned as the (0-0) vibrational transition of the [17.0] 2Δ3/2(?)←X 2Π1/2 system of AlCa. The resolution of the rotational structure in the present study enabled a definite assignment as a 2Π1/2←2Π1/2 transition. Analysis of the spectrum gives B0′=0.096685(19) cm-1, (p+2q)′=-0.013078(370) cm-1, and B0″=0.105518(20) cm-1. These convert to ground and excited state bond lengths of r0″=3.14942(30) and r0′=3.29014(32) A?, respectively.
