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排序方式: 共有56条查询结果,搜索用时 31 毫秒
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Alan D. Potoff Bertrand L. Chamberland Lewis Katz 《Journal of solid state chemistry》1973,8(3):234-237
A single crystal study of hydrothermally prepared eight-layer BaMnO3 has been carried out which confirms the (Zhdanov notation) 121121 layer stacking scheme for the BaO3 layers. The MnO6 octahedra share faces in strings of four, and these strings are connected to each other by corner sharing. The compound has an hexagonal unit cell of dimensions a = 5.667 ± 0.003 and c = 18.738 ± 0.009 Å, probable space group . Its structure has been determined from 352 independent reflections, of which 242 were considered observed, collected manually by a counter technique and refined to a conventional R value of 0.079. 相似文献
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B.L. Chamberland M.P. Herrero-Fernandez T.A. Hewston 《Journal of solid state chemistry》1985,59(1):111-115
The preparation of the compounds Sr2CrO4, Ba2CrO4, and Ba3CrO5 is described. The characterization of these three Cr4+ compounds by X-ray and magnetic susceptibility experiments has been conducted. The magnetic moments for Sr2CrO4, Ba2CrO4, and Ba3CrO5 were determined to be in good agreement with the calculated value expected for a tetrahedral Cr4+ ion. Weak antiferromagnetic ordering for all three compounds is indicated from the small paramagnetic Weiss constants determined from the susceptibility data in the temperature region 80–300 K. Distortions of the tetrahedra from ideality, as determined from the structural features, further cause a reduction in the magnetic moments from the theoretical values. 相似文献
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Marc Chamberland 《Journal of Number Theory》2006,120(2):349-371
We study congruence and divisibility properties of a class of combinatorial sums that involve products of powers of two binomial coefficients, and show that there is a close relationship between these sums and the theorem of Wolstenholme. We also establish congruences involving Bernoulli numbers, and finally we prove that under certain conditions the sums are divisible by all primes in specific intervals. 相似文献
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The infrared spectra, indexed X-ray powder diffraction patterns, magnetic susceptibilities between 80 and 300 K, and electron paramagnetic resonance spectra at 80 and 300 K are reported for Cr2O5 and Cr3O8. The results indicate that both oxides are Cr3+/Cr6+ mixed-valence compounds which contain CrO6 octahedra and CrO4 tetrahedra in different ratios. The valence formula for Cr2O5 is Cr3+2Cr6+4O15 and that of Cr3O8 is Cr3+2Cr6+7O24. The X-ray powder data for Cr2O5 and Cr3O8 could be indexed on the basis of a monoclinic unit cell and an orthorhombic unit cell , respectively. 相似文献
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Robert F. Sarkozy Carl W. Moeller B.L. Chamberland 《Journal of solid state chemistry》1974,9(3):242-246
Several calcium iridium oxides were prepared by solid state reactions and by a hydroxide precipitation technique. These phases were characterized by X-ray powder diffraction data, electrical and magnetic properties. The calcium-rich phase, Ca4IrO6, was an insulator exhibiting Curie-Weiss behavior above 77°K with a Weiss constant of ?47°K and a magnetic moment of 1.76 μB.Ca2IrO4 is a semiconductor and the temperature-dependent susceptibility above 77°K was analyzed in terms of one-dimensional linear chains of octahedrally coordinated Ir4+ ions.Two CaIrO3 phases were isolated, but only the orthorhombic perovskite modification was sufficiently pure for magnetic studies. It was Pauli paramagnetic with metallic conductivity. 相似文献
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