Preparation and crystal structure of Sr{sub 5}TiNb{sub 4}O{sub 17}

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Materials Research Bulletin

DOI:https://doi.org/10.1016/0025-5408(95)00177-8· OSTI ID:215329

Drews, A R ^[1]; Wong-Ng, W; Roth, R S; Vanderah, T A ^[2]

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1. Naval Research Lab., Washington, DC (United States). Condensed Materials and Radiation Sciences Div.
2. National Inst. of Standards and Technology, Gaithersburg, MD (United States). Ceramics Div.

The compound Sr{sub 5}TiNb{sub 4}O{sub 17} was prepared and its crystal structure determined by single-crystal X-ray diffraction. This compound crystallizes with an orthorhombic unit cell (space group Pnnm (No. 58); a = 5.6614(4), b = 32.515(7), c = 3.9525(3) {angstrom}; Z = 2). The structure consists of alternating perovskite-like slabs offset with respect to each other by a/2 and c/2. The Sr{sup 2+} ions occupy two 12-fold coordinated sites within the slabs and a distorted (7 + 1)-fold coordinated site in the gap separating the slabs. Nb{sup 5+} and Ti{sup 4+} are distributed among the octahedral sites of the sperovskite slabs with preferential ordering of Ti{sup 4+} on octahedral sites in the center of the slabs and Nb{sup 5+} in the octahedral sites at the edges of the slabs adjacent to the gap. This compound is the n = 5 member of a structural series A{sub n}B{sub n}O{sub 3n+2}, (A = Sr; B = Ti,Nb) where n is the number of perovskite layers within each slab.

• OSTI ID: 215329
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 31; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL GROWTH
CRYSTAL STRUCTURE
LATTICE PARAMETERS
MONOCRYSTALS
NIOBIUM OXIDES
ORTHORHOMBIC LATTICES
PEROVSKITE
POWDERS
STOICHIOMETRY
STRONTIUM OXIDES
SYNTHESIS
TITANIUM OXIDES
X-RAY DIFFRACTION