The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACT:We describe the synthesis and characterization of a family of materials, Zr 1-x Sn x Mo 2 O 8 (0 < x < 1) whose isotropic thermal expansion coefficient can be systematically varied from negative to zero to positive values. These materials allow tunable expansion in a single phase as opposed to using a composite system. Linear thermal expansion coefficients, α l , ranging from -7.9(2) × 10 -6 K -1 to +5.9(2) × 10 -6 K -1 (12 to 500 K) can be achieved across the series; contraction and expansion limits are of the same order of magnitude as the expansion of typical ceramics. We also report the various structures and thermal expansion of "cubic" SnMo 2 O 8 , and use time-and temperature-dependent diffraction studies to describe a series of phase transitions between different ordered and disordered states of this material.

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Samples of cubic Zr1‐xSnxMo2O8 (0.2 ≤ x ≤ 1) are prepared by coprecipitation of aqueous ZnCl4 and ZrOCl2 with (NH4)6Mo7O24 followed by a controlled heating step (853 K, 0.5 h, heating rate of 2 K/min).

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