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Open AccessJournal ArticleDOI

The crystal structure of some alkaline earth metal uranates of the type M3UO6

H. M. Rietveld
- 01 Apr 1966 - 
- Vol. 20, Iss: 4, pp 508-513
TLDR
In this article, the phase problem in X-ray crystal analysis has been studied, and the results show that it is NP-hard to find the optimal solution to the problem.
Abstract
BLAKE, D., CALVIN, G. & COATES, G. E. (1959). Proc. Chem. Soc. p. 396. CARTER, F. L. t~ HUGHES, E. W. (1957). Acta Cryst. 10, 801. COATES, G. E. & PARKIN, C. (1961). J. Inorg. Nucl. Chem. 22, 59. CHou, K. T. (1963). K'o-hsueh t'ung-pao, 8, 47. CRUICKSHANK, D. W. J., PILLING, D. E., BuJOSA, A., LOYELL, F. M. & TRUTER, M. R. (1961). Computing Methods and the Phase Problem in X-ray Crystal Analysis, p. 32. Oxford: Pergamon Press. HOARD, J. L. (1933). Z. Kristallogr. 84, 231. International Tables for X-ray Crystallography (1962). Vol. III, pp. 202, 211. Birmingham: Kynoch Press. KIMBALL, G. E. (1940). J. Chem. Phys. 8, 188. LIDE, D. R. & MANN, D. E. (1958). J. Chem. Phys. 29, 914. MATHEWS, F. S. & LIPSCOMB, W. N. (1959). J. Phys. Chem. 63, 845. NYBURG, S. C. & HILTON, J. (1959). Acta Cryst. 12, 116. PAULING, L. (1960). The Nature of the Chemical Bond. Ithaca: Cornell Univ. Press. ROLLETT, J. S. & SPARKS, R. A. (1960). Acta Cryst. 13, 273.

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Reverse Monte Carlo Simulation: A New Technique for the Determination of Disordered Structures

TL;DR: In this paper, a new technique based on the standard Monte Carlo simulation method with Markov chain sampling is developed, in which a set of three dimensional particle configurations are generated that are consistent with the experimentally measured structure factor.
Journal ArticleDOI

A2B′B″O6 perovskites: A review

TL;DR: A survey of the literature for ca. one thousand B-site substituted perovskite oxides can be found in this article, together with their electronic and magnetic properties and properties.
Journal ArticleDOI

Synthesis and size-dependent exchange bias in inverted core-shell MnO|Mn3O4 nanoparticles.

TL;DR: Core-shell nanoparticles of MnO|Mn3O4 with average particle sizes of 5-60 nm, composed of an antiferromagnetic (AFM) core and a ferrimagnetic (FiM) shell, have been synthesized and their magnetic properties investigated.
Journal ArticleDOI

XRD, XAS, and IR Characterization of Copper-Exchanged Y Zeolite

TL;DR: In this paper, the locations of copper ions in CuI−Y zeolite, prepared by gas-phase exchange of NH4−Y with CuCl, have been investigated employing XRPD, XAS and IR spectroscopies.