Although the true structure of La 2 CuO 4 is orthorhombic, it can be approximated as tetragonal

Question:

Although the true structure of La2CuO4 is orthorhombic, it can be approximated as tetragonal with space group #139 I4/mmm, unit-cell parameters of a = 3.814 Å and c = 13.15 Å, and crystallo graphically non-equivalent atoms at the following coordinates (and Wyckoff sites): Cu 0 0 0 (2a); La 0 0 0.362 (4e); O1 0 ½ 0 (4c); O2 0 0 0.187 (4e). The symmetry generates equivalent positions: Rotational symmetry generates the additional coordinate ½ 0 0 for Wyckoff site 4c and 0 0 −z for Wyckoff site 4e. Translational symmetry generates equivalent positions at (½,½,½)+ for all coordinates of the four Wyckoff sites.

(a) Sketch the structure.

(b) State the coordination geometry around each metal ion.

(c) Calculate the Cu–O bond distances.

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For  book-img-for-question

Solid State Materials Chemistry

ISBN: 9780521873253

1st Edition

Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt

Question Posted: