A new homologous series of lanthanum copper oxides
Abstract
We report the synthesis and structural characterization of a new homologous series of lanthanum cuprates, with the formula La 4+4 nCu 8+2 nO 14+8 n. The n = 2 and n = 3 members, La 2Cu 2O 5 and La 8Cu 7O 19, synthesized in the bulk, are stable in very narrow temperature ranges in air and oxygen. The n = 4 member was observed by electron microscopy. The crystal structure of La 2Cu 2O 5 consists of thin ribbons of La 2CuO 4 sandwiched between CuO planes of complex low dimensional geometry. The temperature-dependent magnetic susceptibilities of La 2Cu 2O 5 and La 8Cu 7O 19 are characteristic of low dimensional Heisenberg antiferromagnets with a low exchange coupling energy.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- September 1991
- DOI:
- 10.1016/0022-4596(91)90230-F
- Bibcode:
- 1991JSSCh..94..170C