Transforming n = 1 members of the Ruddlesden–Popper phases to a n = 3 member through metathesis: synthesis of a new layered perovskite $Ca_2La_2CuTi_2O_{10}$

Sivakumar, T and Lofland, SE and Ramanujachary, KV and Ramesha, K and Subbanna, GN and Gopalakrishnan, J (2004) Transforming n = 1 members of the Ruddlesden–Popper phases to a n = 3 member through metathesis: synthesis of a new layered perovskite $Ca_2La_2CuTi_2O_{10}$. In: Journal of Solid State Chemistry, 177 (7). pp. 2635-2638.

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Abstract

We report the formation of a new n = 3 Ruddlesden–Popper (R–P) layered perovskite oxide, $Ca_2La_2CuTi_2O_{10}$ (I), in the metathesis reaction between $NaLaTiO_4$ and $Ca_2CuO_2Cl_2$ (n = 1 R–P phases) at $700^oC$ in air. Rietveld refinement of powder XRD data shows that I is isostructural with $Sr_4Ti_3O_{10}$ (space group I4=mmm; a = 3.8837(5), c = 27.727(6)$\AA$ ), consisting of triple perovskite $CuTi_2O_{10}$ sheets wherein Cu and Ti are ordered at the central and terminal octahedral sites, respectively. Magnetization data provide support for the presence of strong antiferromagnetically coupled $CuO_2$ sheets in the structure. I is metastable decomposing at higher temperatures $(\sim950^oC)$ to a mixture of perovskite-like $CaLa_2CuTi_2O_9$ and CaO. Interestingly, the reaction between $NaLaTiO_4$ and $Sr_2CuO_2Cl_2$follows a different metathesis route,$2NaLaTiO_4+Sr_2CuO_2Cl_2\rightarrowLa_2CuO_4+2SrTiO_3+2NaCl$ revealing multiplicity of reaction pathways for solid-state metathesis reactions.

Item Type:	Journal Article
Publication:	Journal of Solid State Chemistry
Publisher:	Elsevier
Additional Information:	The copyright belongs to Elsevier.
Keywords:	Layered perovskite;Ruddlesden–Popper phase;Metathesis;Oxyhalide
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	27 Jun 2007
Last Modified:	19 Sep 2010 04:26
URI:	http://eprints.iisc.ac.in/id/eprint/6492

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