Refinement of the crystal structures of the La3Ta0.5Ga5.5O14 and La3Nb0.5Ga5.5O14 compounds |
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Authors: | A P Dudka B V Mill and Yu V Pisarevsky |
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Institution: | (1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiĭ pr. 59, Moscow, 119333, Russia;(2) Moscow State University, Moscow, 119992, Russia |
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Abstract: | This paper reports on the results of accurate X-ray structural investigations of single crystals La3Ta0.5Ga5.5O14 (a = 8.2260(1) ?, c = 5.1207(1) ?, R/R
w
= 1.09%/1.10%, 3868 unique reflections) and La3Nb0.5Ga5.5O14 (a = 8.2237(1) ?, c = 5.1247(1) ?, R/R
w
= 1.02%/1.03%, 3735 unique reflections) (space group P321, Z = 1, sinϑ/λ|max ≈ 1.34 ?−1 for both compounds). Using sets of data with a large number of high-angle reflections makes it possible to reliably compare
the crystal structures by applying statistical tests. The structural differences between the La3Ta0.5Ga5.5O14 and La3Nb0.5Ga5.5O14 crystals are weakly pronounced, which correlates with the closeness of their piezoelectric characteristics.
Original Russian Text ? A.P. Dudka, B.V. Mill, Yu.V. Pisarevsky, 2009, published in Kristallografiya, 2009, Vol. 54, No. 4,
pp. 599–607. |
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Keywords: | |
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