Lattice parameter variation

Based on the prediction for the M3B2 boride, and its observed lattice parameter variation with Fe, Cr and Mo levels, the structure of the Mo-rich phase was reevaluated and clearly shown to be primitive tetragonal of the U3Si2-type (Kim et al. 1990). This work also gave results for ratio of Fe Cr Mo in the various phases which were in excellent agreement with those predicted at 1000°C. 

Figure 6. Lattice parameter variations through the tetragonal orthorhombic transition in stishovite (data of Ross et al. 1990 Hemley et al. 1994 Mao et al. 1994 Andrault et al. 1998). Filled circles are the data of Ross et al., Hemley et al. and Andrault et al. open squares are the data of Mao et al. open circles represent the reference parameter Oo given by crosses are reference param-...

The question is now to determine if the two elements are alloyed in the bimetallic particles. The Pd-Mn phase diagram is complex well defined compounds such as MnPd, MnPd2 and MnPds can be formed, but above 1300 K, and they are not observed here by X-ray diffraction. Below 1000 K, a solid solution of Mn in Pd, the a phase, extending up to a Mn concentration of 30 % can be formed. It cannot however be evidenced by X-ray diffraction since no lattice parameter variation occurs. The only method able to detect a formation of alloy is EXAFS. Actually the experiments were performed at LURE, in transmission mode, above the Pd K edge. Additional experiments at the Mn K edge in fluorescence mode showed that a large proportion of MnOx is present... 

Fig. 2. Cr-Fe-Si. The lattice parameter variation of the s phase as a function of Cr content...

San] Sankpal, A.M., Sawant, S.R., Vaingankar, A.S., Electrical Resistivity and Lattice Parameters Variation in Copper-Nickel Ferrite , Indian J. Pure Appl. Phys., 26, 459—461 (1988) (Experimental, Crys. Structure, Electr. Prop., 21)... 

Fig. 10. Ce-Ge-Si, section CeGej Si, proposed lattice parameter variation versus concentration. After Mayer and Eshdat (1968).

Fig. 17.7. (A) Lattice parameter variation for HUP as a function of temperature", with permission. (B) DSC trace of deuterated analogue (DUP)" (enthalpies in kcal mol" ).

Various recent studies of the lattice parameter variation of ZrC are compared in Fig. 10. Except for the upper cluster of points, there is an... 

Sardela MR, Hanson GV (1995) Thermal relaxation kinetics of strained Si/Sii Ge, heterostructures determined by direct measmement of mosaicity and lattice parameter variations. J Vac Sci Tech A 13 314... 

Fig. 20.8. Lattice parameter variation with temperature for two Smi, Y,S samples. The anomalous expansion for x - 0.25 without a first-order transition is noteworthy (Jayaraman et al., 1975a).

A further stoichiometry change is reached by introducing Fe vacancies. Then, compounds such as FeSij (CsCl) are formed (Figure 14.10). A lattice parameter variation concomitant with the stoichiometry change in FeSii+ (CsCl) metastable compounds has been experimentally detected [84]. We note that all along these phases. Si atoms present an analogous coordination, where each Si atom occupies... 

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