Electronic structure of the sigma-phase in paramagnetic Fe-V alloys. Experimental and theoretical study

The electronic structure of $\sigma$-phase Fe$_{100-x}$V$_x$ compounds with 33.3 $\le x \le 60.0$ was calculated from the charge self-consistent Korringa-Kohn-Rostoker method. For the first time, charge densities $\rho_A(0)$ and electric field gradients were determined at Fe nuclei, that occupy five nonequivalent lattice sites. The highest $\rho_A(0)$ values were found on sites A and D, and the lowest one on site B, the difference ranging between 0.162 and 0.174 $\it s$-like electrons per Fe atom for $x = 33.3$ and $x = 60$, respectively. The calculated quantities combined with experimentally determined site occupancies were successfully applied to analyze $^{57}$Fe M\"ossbauer spectra recorded on a series of 8 samples in a paramagnetic state.Comment: 4 pages, 4 figures, 15 reference

Short-Range Order in Fe-Rich Fe-Cr Alloys as Revealed by M\"ossbauer Spectroscopy

Distribution of Cr atoms in Fe_{100-x}Cr_x alloys with x \le 25 within the first two coordination shells, 1NN-2NN, around probe 57Fe atoms was studied by means of the M\"ossbauer Spectroscopy. Clear evidence was found that the distribution is characteristic of a given atomic configuration. Only the configurations with Cr atoms situated in 2NN exhibit a quiasi-random distribution, while those with Cr atoms present in 1NN shell and those with Cr atoms in both shells is evidently not random showing clastering or anticlastering features. These findings are novel and much more complete than the up-to-date knowledge according to which there is an inversion of the short-range order parameter at x = 11. The inversion in the present study was found only for the configuration with one Cr atom in 1NN. On average, Cr atoms are distributed almost randomly within the 1NN-2NN volume for x \eq ~10, and do cluster for larger x.Comment: 4 pages and 4 figure

The Lack of Consensus Among Catholics for Establishing New Elementary Schools

For a century Catholic schools have formed the basis for a strong system of acculturation into Catholic identity and values. Catholic schools provided a low-cost basic education and served as a common school for all social classes of Catholics. This system has weakened considerably in the last decades. Between 1970 and 2000 there was a net loss of 3,595 Catholic schools in the United States, a 29.9% decline. In addition, the nature of these schools seems to be changing as the percentage of total Catholic school enrollment made up by non-Catholics has increased ten-fold in 30 years. Many Catholic Schools seem to have pursued increased academic excellence at the expense of religious acculturation. This paper examines diocesan data to determine the extent to which Catholics still consider Catholic elementary schools to be important. Findings include survey data on school importance from 55,000 diocesan Catholics. I addition, parishioner survey results are presented from two suburban parishes, each of which is considering establishing a parochial elementary school. If new elementary schools are going to be established, a way must be found for Catholics to arrive at a consensus on this issue