Crystal Structure of Tetragonal Form of La<SUB>2</SUB>NiO<SUB>4+<I>x</I></SUB>

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  • Crystal Structure of Tetragonal Form of La2NiO4+x
  • Crystal Structure of Tetragonal Form of

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The crystal structure of the title oxide was studied by means of the X-ray and neutron single crystal diffraction measurements. At room temperature, the tetragonal crystal structure is P42/ncm-type (No. 138), which is one of the subgroup of the space group I4/mmm. The lattice parameters of a sample annealed and slowly cooled in oxygen atmosphere from 673 K are a=b=5.4640(1) Å and c=12.6719(2) Å, while the oxygen content, x=0.10(4), was determined from obtained neutron data. The title oxide undergoes a tetragonal (P42/ncm)/tetragonal (I4/mmm) phase transition at about 560 K. The transition temperature is almost identical both in the annealed and as-grown crystals.

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