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The Defect Chemistry of LaMnO3±δ: 3. The Density of (La,A)MnO3+δ (A = Ca, Sr, Ba)

✍ Scribed by J.A.M. Van Roosmalen; E.H.P. Cordfunke

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
151 KB
Volume
110
Category
Article
ISSN
0022-4596

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✦ Synopsis

The density of (\mathrm{La}{1-x} A{x} \mathrm{MnO}{3+\delta}) was determined for (x=0,0.15), (0.30(A=\mathrm{Ca}, \mathrm{Sr}, \mathrm{Ba})) and for (x=0.50(A=\mathrm{Sr})) using a pycnometer, defect chemical considerations, lattice parameters, and chemical analyses. The oxygen excess in (\mathrm{LaMnO}{3+5}) is compensated by both (L a) and (M n) vacancies in equal amounts. This is confirmed by density measurements. According to this defect model the density of (\mathrm{LaMnO}{3+\delta}) is almost independent of (\delta) for (0 \leq \delta \leq 0.18) and is calculated to be ((6.57 \pm 0.02) \mathrm{g} \cdot \mathrm{cm}^{-3}). The same defect model is applied to calculate the density of (\mathrm{La}{1-x} A_{x} \mathrm{MnO}_{3+\delta}). 1994 Academtc Press, Inc.

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