Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Mechanistics of stabilisation via doping in bismuthsesquioxide $(Bi_{2-2x}Ho_{2x} O_3;x = 0.2)$ A combined approach of Rietveld and microstructural analysis

Sooryanarayana, K and Somashekar, R and Row, Guru TN (1997) Mechanistics of stabilisation via doping in bismuthsesquioxide $(Bi_{2-2x}Ho_{2x} O_3;x = 0.2)$ A combined approach of Rietveld and microstructural analysis. In: Solid State Ionics, 104 (3-4). pp. 319-324.

 PDF Mechanistics-395.pdf Restricted to Registered users only Download (120kB) | Request a copy

Abstract

$\delta-Bi_{1.6} Ho_{0.4} O_3$, is cubic, Fm3m, with a=5.5291(5) \AA, $V=169.03(3) \AA^3$ , $D_{calc} =8.838 g/ cm^3$ , $D_{measured}$ (powder technique)$=8.607 g/cm^3$ , with Z=2. Rietveld profile refinements on high resolution X-ray diffraction data give $R_p = 0.143$, $R_{wp} = 0.188$, $R_{(I,HKL)} = 0.090$, $R_{(expected)}=0.078$ confirming the earlier results on the structure of this phase to have a fluorite type lattice with highly disordered oxygen sublattice. Strain and crystal size analysis of all the reflections in the range $(2\theta = 5-100.94^o)$ from holmium doped bismuth sesquioxide were carried out and compared with the results of the simulated whole powder pattern of $Bi_2 O_3$ for $\alpha$ and $\delta$ phases. These results provide pointers to the possible mechanism of stabilization of $\delta$ phase on holmium substitution.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Bismuth sesquioxide;Holmium stabilized phase;Rietveld refinements;Microstructural parameters Division of Chemical Sciences > Solid State & Structural Chemistry Unit Anka Setty 30 May 2007 19 Sep 2010 04:36 http://eprints.iisc.ac.in/id/eprint/10381