Near-zero thermal expansion and phase transition in In0.5(ZrMg)0.75Mo3O12. Issue 20 (27th September 2016)

• Record Type: Journal Article
• Authors: Prisco, Luciana P.; Pontón, Patricia I.; Paraguassu, Waldeci; Romao, Carl P.; White, Mary Anne; Marinkovic, Bojan A.
• Is Part Of: Journal of materials research. Volume 31:Issue 20(2016)
• Page Start: 3240
• Page End: 3248
• Publication Date: 2016-09-27
• Subjects: phase transformation, -- Raman spectroscopy, -- x-ray diffraction (XRD); Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2016.329
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : Physical properties of In0.5 (ZrMg)0.75 Mo3 O12, including the coefficient of thermal expansion, phase stability, hygroscopicity, and decomposition temperature have been thoroughly studied by in situ x-ray powder diffraction, Raman spectroscopy and thermal methods. These investigations show that In0.5 (ZrMg)0.75 Mo3 O12 exists in a monoclinic phase ( P 21 / a ) at room temperature and transforms to an orthorhombic ( Pbcn ) phase at ∼82 °C. In the orthorhombic form this material presents intrinsic near-zero thermal expansion (−0.16 × 10 −6 K −1 ) in the range between 100 and 500 °C. The phase is not hygroscopic, but starts to decompose into its constituent oxides at temperatures higher than 700 °C. In comparison to the end member phase ZrMgMo3 O12 in the In2 Mo3 O12 –ZrMgMo3 O12 solid solution, In0.5 (ZrMg)0.75 Mo3 O12 is less promising for near room-temperature applications due to the phase transition from monoclinic to orthorhombic slightly above room temperature. However, the orthorhombic phase of In0.5 (ZrMg)0.75 Mo3 O12 has potential for applications that require zero thermal expansion at temperatures higher than 100 °C.