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

  • D. A. Woodcock (a1), P. Lightfoot (a1) and R. I. Smith (a2)

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.

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

  • D. A. Woodcock (a1), P. Lightfoot (a1) and R. I. Smith (a2)

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