UNSPECIFIED (2005) The high-pressure behaviour of Ba-doped Na1/2Bi1/2TiO3 investigated by Raman spectroscopy. JOURNAL OF PHYSICS-CONDENSED MATTER, 17 (41). pp. 6587-6597. doi:10.1088/0953-8984/17/41/027 ISSN 0953-8984.

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Abstract

We report high-pressure Raman measurements up to 20.2 GPa on the perovskite-type oxide (Na1/2Bi1/2)(0.89)Ba0.11TiO3 (NBT-BT0.11), which is of interest as a potential lead-free piezoelectric material. Distinct changes of the Raman spectra with increasing pressure illustrate that NBT-BT0.11 shows at least two phase transitions. First, the application of low pressure progressively reduces the tetragonal signature in NBT-BT0.11 and leads at around 1.8 GPa to a Raman spectrum reminiscent of rhombohedral NBT. Second, with further increase of pressure, the pressure-dependent behaviour of NBT-BT0.11 resembles that of NBT and transforms to a non-cubic high-pressure structure at around 9 GPa. These observations suggest that a progressive substitution of Na+/Bi3+ by Ba2+ pushes the pressure-induced structural instabilities of NBT towards higher pressure, corresponding to a Ba2+-induced negative (tensile) pressure within the structure.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
ISSN:	0953-8984
Official Date:	19 October 2005
Dates:	Date Event 19 October 2005 UNSPECIFIED
Volume:	17
Number:	41
Number of Pages:	11
Page Range:	pp. 6587-6597
DOI:	10.1088/0953-8984/17/41/027
Publication Status:	Published

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