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Surface morphological study of flux grown lead doped rare-earth manganite single crystals

Nilotpal, Ghosh and Padmanabhan, B and Suja, Elizabeth and Bhat, HL (2005) Surface morphological study of flux grown lead doped rare-earth manganite single crystals. In: The 14th International Conference on Crystal Growth and the 12th Internatioanl Conference on Vapor Growth and Epitaxy, Feb 15 2005, e163-e167.

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Abstract

Rare-earth manganites with divalent doping have attracted attention because of their interesting physical phenomena. Manganites, doped with divalent lead, are grown from solvent PbO–$PbF_2$. Single crystals of $R_{1-x}_Pb_xMnO_3$ and mixed rare-earth $(R_y R_{1-y})_{1-x}Pb_xMnO_3$, where R, R =La, Nd and Pr are grown with different values of x using eutectic composition of $PbO: PbF_2$ as solvent. Growth temperature can then be significantly reduced. Optimized charge-to-flux ratio 1:6 yields large crystals with dimension up to $4 \times 3 \times 2 mm^3$. A variety of surface features such as hillocks, micro and macro step patterns, dendrites as well as clear featureless surfaces are observed on as-grown crystals. Clear surfaces reveal that growth occurred predominantly by two-dimensional layer growth mechanism. The hillocks might have originated at the site of screw dislocation, which suggests the growth mechanism at low supersaturation. Hopper growth observed on a few crystals is suggestive of unstable growth. Optimum growth parameters are employed to achieve better yield and good quality crystals.

Item Type: Conference Paper
Additional Information: This article copyright belongs to Elsevier.
Keywords: A1. Crystal morphology; A1. Dendrites; B1. Manganites; B2. Magnetic materials.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 27 Feb 2008
Last Modified: 19 Sep 2010 04:42
URI: http://eprints.iisc.ernet.in/id/eprint/13038

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