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Negative Thermal Expansion Behaviour in The NZP Phase NbTi(PO4)3

Published online by Cambridge University Press:  16 February 2011

D. A. Woodcock ,
P. Lightfoot  and
R. I. Smith
D. A. Woodcock
Affiliation:
School of Chemistry, University of St. Andrews, Purdie Building, North Haugh, St. Andrews, Fife, UK, KY16 9ST, pl@st-and.ac.uk
P. Lightfoot
Affiliation:
School of Chemistry, University of St. Andrews, Purdie Building, North Haugh, St. Andrews, Fife, UK, KY16 9ST, pl@st-and.ac.uk
R. I. Smith
Affiliation:
The ISIS Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX
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Abstract

We present new detailed structural data versus temperature on the Nasicon structured material NbTi(PO4)3 obtained from powder neutron diffraction studies. This material shows a significant volume contraction over the range 20°C < T < 700°C. αa varies between –4.34 and -0.11 × 10-6°C-1 and αc between 0.08 and 3.07 × 10-6°C-1 over this range. This behaviour contrasts with the case of NaTi2(PO4)3 (NaTP) which shows a positive volume expansion. The difference in this behaviour can be explained by the presence of filled MI sites in NaTP which are vacant in the case of NbTP.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 191
Copyright
Copyright © Materials Research Society 1999

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