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Synthesis and Structure of a New Family of Nickelates: Tl(Ln2Sr2)Ni2O9, Ln=La, Pr, Nd, Sm, Eu, and Gd

✍ Scribed by C.S. Knee; M.T. Weller

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
291 KB
Volume
150
Category
Article
ISSN
0022-4596

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✦ Synopsis

A novel series of nickelates described by the formula Tl(Ln 2 Sr 2 )Ni 2 O 9 , Ln ‫؍‬ La, Pr, Nd, Sm, Eu, and Gd, have been synthesized and their structures determined using both powder X-ray di4raction and powder neutron di4raction. The materials are isostructural with the superconducting cuprate, Tl(La 2.4 Ba 1.6 )Cu 2 O 9 , crystallizing in a tetragonal unit cell, space group I4/mmm, lattice parameters a ‫؍‬ 3.8069+3.7667(1) A s and c ‫؍‬ 30.055+29.390(1) A s . The compounds adopt the 1201+0201 intergrowth structure, consisting of layers of apex-sharing stoichiometric NiO 6 octahedra connected by a TlO layer. A decrease in the cell dimensions is observed across the series, consistent with the lanthanide contraction and partial ordering of the strontium and lanthanide ions on the A cationic sites is observed. Magnetic susceptibility data reveal no evidence of long-range magnetic ordering for two of the compounds, Tl(La 2 Sr 2 )Ni 2 O 9 and Tl(Gd 2 Sr 2 )Ni 2 O 9 .

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