# $R_3Mn_{1.5}CuV_{0.5}O_9$ (R = Y, Ho, Er, Tm, Yb and Lu) and $Lu_3Mn_{3-3x}Cu_{2x}V_xO_9$: New noncentrosymmetric oxides related to $YMnO_3$

Surendran, KP and Mani, Rohini and Gopalakrishnan, J and Ramanujachary, KV and Lofland, SE and Green, William L (2007) $R_3Mn_{1.5}CuV_{0.5}O_9$ (R = Y, Ho, Er, Tm, Yb and Lu) and $Lu_3Mn_{3-3x}Cu_{2x}V_xO_9$: New noncentrosymmetric oxides related to $YMnO_3$. In: Materials Research Bulletin, 42 (4). pp. 618-625.

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## Abstract

We report formation of new noncentrosymmetric oxides of the formula, $R_3Mn_{1.5}CuV_{0.5}O_9$ for R = Y, Ho, Er, Tm, Yb and Lu, possessing the hexagonal $RMnO_3$ (space group $P6_3cm$) structure. These oxides could be regarded as the x = 0.5 members of a general series $R_3Mn_{3-3x}Cu_{2x}V_xO_9$. Investigation of the $Lu-Mn-Cu-V-O$ system reveals the existence of isostructural solid solution series, $Lu_3Mn_{3-3x}Cu_{2x}V_xO_9$ for $0 < x \leq 0.75$. Magnetic and dielectric properties of the oxides are consistent with a random distribution of $Mn^{3+}$, $Cu^{2+}$ and $V^{5+}$ atoms that preserve the noncentrosymmetric RMnO3 structure.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Oxides;Chemical synthesis;X-ray diffraction;Magnetic properties Division of Chemical Sciences > Solid State & Structural Chemistry Unit 30 May 2008 19 Sep 2010 04:45 http://eprints.iisc.ernet.in/id/eprint/14126