Study of Phase Transitions in WO3 with a High-Temperature X-Ray Diffractometer

Perri, J. A.; Banks, Elliot; Post, B.

doi:10.1063/1.1722631

Cited by 65 publications

(13 citation statements)

References 7 publications

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“…Another reaction begins at about 743 8C, which could be due to the transformation from the orthorhombic to the tetragonal structure. These polymorphic transformations were also reported by Perri et al [9]. The MCrAlY powder shows three reactions.…”

Section: Resultssupporting

confidence: 59%

In-situ synthesis of Y2W3O12 within a Co-based superalloy powder mixture

Hopfeld

Wilden

Drescher

et al. 2010

International Journal of Materials Research

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In-situ synthesis of Y 2 W 3 O 12 within a Co-based superalloy powder mixture In this work, the synthesis of the negative thermal expansion ceramic Y 2 W 3 O 12 within a Co-based superalloy was analyzed in detail. On the basis of thermal analysis of the synthesis from the feedstock powders Y 2 O 3 and WO 3 further experiments were conducted. Thermal behavior and stability of different mixtures of the powders Y 2 O 3 , WO 3 and the Co-based superalloy were investigated. The qualitative and quantitative results of the synthesis separately and within the superalloy are presented as achieved by energy dispersive X-ray analysis, X-ray powder diffraction, differential thermal analysis and thermal gravimetric analysis. It was found that the synthesis of yttrium tungstate inside the Co-based superalloy is possible with a defined temperature program and a simple basic production process of powder mixtures.

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Section: Resultssupporting

confidence: 59%

In-situ synthesis of Y2W3O12 within a Co-based superalloy powder mixture

Hopfeld

Wilden

Drescher

et al. 2010

International Journal of Materials Research

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“…The HRTEM analysis was carried out to observe the lattice fringes of the as-prepared WO3 nanoparticles (Fig. 2b); and the lattice distance was measured to be of d002 = 0.38 ± 0.01nm, which is close to the bulk WO3 d002 value; and suggests the formation of a monoclinic tungsten oxide phase [42,43]. The selected area electron diffraction (SAED) pattern exhibits diffuse rings, indicating that the sample has a polycrystalline nature.…”

Section: Microstructural and Structural Analysismentioning

confidence: 81%

Highly efficient electro-optically tunable smart-supercapacitors using an oxygen-excess nanograin tungsten oxide thin film

Inamdar

Kim

et al. 2017

Solar Energy Materials and Solar Cells

105

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Next-generation electronic technology requires the use of advanced energy storage devices with integrated functionality to fulfill key application requirements. A smart supercapacitor shares the same electrochemical processes as a conventional energy storage device in addition to electrochromic functionality. It can sense the energy storage level and can display it in a noticeable manner, which results in added convenience to everyday applications. In this study we have developed a smart supercapacitor that uses tungsten oxide nanograin thin film to provide the combined advantages of energy storage and electrochromism. The nanostructured tungsten oxide is dark blue in the charged state and becomes transparent in its discharged state; and it has a specific capacitance of 228 Fg −1 at 0.25 Ag −1 with a quite large potential window of 1.4 V. It is highly durable, exhibits good electrochemical stability over 2000 cycles, retains a significant charge storage of 75%; and exhibits a high coloration efficiency of ~170 cm 2 /C with an optical modulation of 82%. The smart-supercapacitor fabricated with this material exhibits a superb combination of 2 energy storage and electrochromic features in one device to monitor the energy storage level through visible changes in color.

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“…A summary of these transitions is given in Table 1. Additionally DTA, heat capacity (3,4), and resistivity (5) studies show discontinuities indicative of phase transitions at approximately 1170 and 1500 K. Furthermore, capacitance and electrical resistivity measurements suggest phase transitions in the low-temperature region at 40, 65, and 130 K (6). However, structural refinements have not previously been performed in the necessary temperature intervals to determine if these discontinuities in the physical properties actually correspond to structural phase transitions of WO .…”

Section: Introductionmentioning

confidence: 97%