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The new compounds RE4O4[AsO4]Cl (RE=La, Pr, Nd, Sm, Eu, Gd) were synthesised by solid state reaction via a salt flux route and investigated by HRTEM, SAED, and single crystal X-ray diffraction. The samples crystallise with a tetragonal cell, space group P42/mnm and Z=2. Their crystal structure consists of an alternation of [RE4O4]4+ and [ClAsO4]4– layers. The [RE4O4]4+ layer contains ORE4/4 tetrahedra...
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