Systematic and Controllable Negative, Zero, and Positive Thermal Expansion in Cubic Zr_1–xSn_xMo₂O₈

Abstract

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.

Synthesis, photocatalytic performance and negative thermal expansion property of nanorods ZrMo2−x V x O8−x/2 with cubic structure

“…3, 0.4 and 0.5) match well with the standard XRD pattern of cubic ZrMo 2 O 8 phase [5,6] as shown in Fig. 1b.…”

“…Therefore, it can be utilized to produce composites with precisely controllable coefficients of thermal expansion (CTEs), which are considered to be used in high-precision electronics and thermometers [6][7][8]. Secondly, cubic ZrMo 2 O 8 has a band gap (2.79 eV) similar to those of commonly utilized semiconductor-based photocatalysts such as TiO 2 and possesses potential as a suitable photocatalyst [9][10][11].…”

Negative thermal expansion in functional materials: controllable thermal expansion by chemical modifications

“…The term of ''negative thermal expansion'' was used only sporadically before the 1990s. 25,26 There are a number of classes of materials with an open-framework structure, such as the NZP family, 16 ZrW 2 O 8 , 1 AM 2 O 7 (A = Ti, Zr, Hf, M = P, V), 2,3 Sc 2 (WO 4 ) 3 , 18 zeolites, 27 Fe[Co(CN) 6 ], 28 metalorganic frameworks, [29][30][31] Zr 0.4 Sn 0.6 Mo 2 O 8 , 32 and ScF 3 . 1 The majority of crystal structures of NTE materials have a common feature of two-coordinate M 1 -O-M 2 linkages for cationic polyhedra which build a 3D lattice.…”

Near-Zero Thermal Expansion and Phase Transitions in HfMg1−xZnxMo3O12

“…Since most materials expand on heating and contract on cooling, materials with opposite property, namely negative thermal expansion (NTE), are particularly desired for tailoring CTEs. The rediscovery of NTE in ZrW 2 O 8 in a wide temperature range (Evans et al, 1996, 1997a) triggered continuous efforts on understanding the NTE phenomenon and searching for more NTE materials (Yang et al, 2007; Chen et al, 2013, 2015; Tallentire et al, 2013; Lama et al, 2014; Liu et al, 2014; Peng et al, 2014; Xiao et al, 2014; Hu et al, 2015). To date, different families of NTE materials based on various mechanisms, such as the phonon effect (Pryde et al, 1996; Wang et al, 2011; Bridges et al, 2014; Cheng et al, 2016a; Ge et al, 2016a), magnetovolume effect (Takenaka and Takagi, 2005; Qu et al, 2012; Yan et al, 2014), spontaneous ferroelectric polarization (Chen et al, 2013; Peng et al, 2016), and charge transfer (Long et al, 2009; Azuma et al, 2011; Yamada et al, 2016) have been reported.…”