Weitere Verbindungen zum Ba6Nd2Al4O15-Typ: Ba4Nd4Zn3PtO15 und Ba4Eu4Zn3PtO15 / Further Compounds of the Ba6Nd2Al4O15 Type: Ba4Nd4Zn3PtO15 and Ba4Eu4Zn3PtO15
1998 ◽
Vol 53
(5-6)
◽
pp. 628-630
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Keyword(s):
X Ray
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Abstract The compounds Ba4Nd4Zn3PtO15; (I) and Ba4Eu4Zn3PtO15 (II) crystallize with hexagonal symmetry, space group C46V-P63mc, (I): a = 11.719(1), c = 6.778(1) Å, (II): a = 11.654(1), c = 6.778(1) Å, Z = 2. Both belong to the Ba6Nd2-. AI4O15 type when replacing 2Ba2+ by 2Ln3+ and 4Al3+ by 3Zn2+ + Pt4+. The tetrahedrally coordinated Al3+ is substituted by Zn2+, the octahedrally one by Pt4+. Due to the similarity of X-ray scattering of Ba2+ and Ln3+ the ordered replacement of Ba2+ by Ln3+ has been proven by calculations of the Coulomb terms of lattice energy.