A hexagonal perovskite intergrowth compound: La2Ca2MnO7

Angewandte Chemie - International Edition

Volumn 39, Issue 15, 2000, Pages 2730-2732

  Wang, Yingxia ^a   Lin, Jianhua ^a   Du, Yu ^a   Qin, Ruiwen ^a   Han, Bin ^a   Loong, Chun K ^b  

^a PEKING UNIVERSITY   (China)

^b ARGONNE NATIONAL LABORATORY   (United States)

Author keywords

Lanthanum; Manganese; Neutron diffraction; Perovskite phases; Solid state structures

Indexed keywords

LANTHANIDE; METAL OXIDE;

ARTICLE; CRYSTAL STRUCTURE; MATERIAL STATE; PHYSICAL CHEMISTRY; STOICHIOMETRY; STRUCTURE ANALYSIS; X RAY DIFFRACTION;

EID: 0034604664     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/1521-3773(20000804)39:15<2730::AID-ANIE2730>3.0.CO;2-L     Document Type: Article

References (11)

1. J. B. Goodenough, A. Manthiram in Chemistry of High Temperature Superconductors (Ed.: C. N. R. Rao), World Scientific, London, 1991, p. 1.
2. H. Müller-Buschbaum, Angew. Chem. 1989, 101, 1503; Angew. Chem. Int. Ed. Engl. 1989, 28, 1472.
3. H. Müller-Buschbaum, Angew. Chem. 1989, 101, 1503; Angew. Chem. Int. Ed. Engl. 1989, 28, 1472.
4. R. von Helmolt, J. Wecker, B. Holzapfel, L. Schultz, K. Sanwer, Phys. Rev. Lett. 1993, 71, 2331.
5. B. Raveau, A. Maignan, C. Martin, M. Hervieu, Chem. Mater. 1998, 10, 2641.
6. C. N. R. Rao, B. Raveau, Transition Metal Oxides, 2nd ed., Wiley-VCH, Weinheim, 1998, p. 61.
7. P. D. Battle, W. R. Branford, A. Mihut, M. J. Rosseinsky, J. Singleton, J. Sloan, L. E. Spring, J. F. Vente, Chem. Mater. 1999, 11, 674.
8. G. H. Hyde, S. Andersson, Inorganic Crystal Structures, Wiley, New York, 1989, p. 74.
9. 3̄ (no. 148), Z = 3, with the lattice constants a = 5.62176(4), c = 17.3161(2), V = 473.968(7). The refined atomic coordinates are Mnl: (3a) 0, 0, 0; Lal: (6c) 0, 0, 0.37757(3); Cal: (6c) 0, 0, 0.82745(7); Ol: (18f) 0.0148(4), 0.502(3), 0.6024(1); O2: (18f) 0, 0.128(1), 0.5. The refined x and z values of the O2 position were x = - 0.020(15) and z = 0.499(3), which are very close to 0 and 1/2, they were therefore fixed to improve the displacement parameters. The occupation factor of O2 was refined and fixed to 1/6, in the final refinement. The refinement also indicates mutual replacement of La and Ca atoms at the Lal and Cal positions, and the ratio was refined and fixed to Lal: La/Ca = 0.933/ 0.077 and Cal: Ca/La = 0.933/0.077 in the final refinement.
10. A. Altomare, M. C. Burla, M. Camalli, G. Cascarano, C. Giacovazzo, A. Guagliardi, G. Polidori, J. Appl. Crystallogr. 1994 27, 435.
11. A. C. Larson, R. B. von Dreele, Report LAUR 86-748, Los Alamos National Laboratory, 1983