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The Mössbauer spectra of three phases of the tetragonal solid solution Ba5FeIII3−xMIIxF19−x(M= Fe, Cu) obtained by substitution of Fe3+byM2+ions, have been studied, as well as their magnetic properties. A mechanism of substitution of the Fe3+cations is proposed according to the Mössbauer data. These compounds are paramagnetic until 4.2 K, with very weak antiferromagnetic interactions below 30–40...
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