ChemInform Abstract: Investigation of the Chromic Phase Transition of CuMo0.9W0.1O4 Induced by Surface Protonation.

Gaudon, Manuel; Riml, C.; Turpain, A.; Labrugère, C.; Delville, Marie-Hélène

doi:10.1002/chin.201102005

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…Moreover, CuMoO4 showed low coefficient of thermal expansion of 4.6 ppm/C, which is close to semiconductor silicon (4 ppm/ o C) forming an additional advantage in the case of device level integration [43]. In addition to this, CuMoO4 is also reported as a thermochromic and piezochromic ceramic as it displays a distinct reversible change in colour at around 200 K at ambient pressure and room temperature for a pressure of 250 MPa due to the structural rearrangement leading two distinct allotropic forms of α and γ [44][45][46][47][48][49][50]. Such chromic materials can find applications as user-friendly temperature and pressure indicators especially in safety improvement, medical, shock detector and packaging, etc.…”

Section: Introductionmentioning

confidence: 95%

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Joseph

Varghese

Teirikangas

et al. 2018

Composites Part B: Engineering

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The present paper presents ceramic composites with ultralow sintering temperature of 500 ̊C with densification of 96 % by adding small amount (0.5, 1 and 2 wt.%) of Ag2O to CuMoO4 by simple mixing method. The effect of Ag2O addition on the structure, microstructure, sintering and thermal as well as microwave dielectric properties of CuMoO4 is also studied. The reduction in the sintering temperature is due to the formation of trace amount (1.4%) of copper silver molybdate (Cu2Ag2(MoO4)3) as observed from Rietveld refinement analysis as well as backscattered SEM image. Doping has very little influence on the structure and coefficient of thermal expansion that is about 4.7-5.2 ppm/C. The composites sintered at 500 ̊C exhibit relative permittivity of about 8-9, quality factor (Qf) of 26000-37000 GHz at 12 GHz, temperature coefficient of resonant frequency of-31-33 ppm/C and are compatible with Al electrode. The present work results in obtaining welldensified ultralow temperature cofired ceramic composites at low sintering temperature without much structural change and good thermal properties but with different dielectric properties by small doping. These composites can be used as low cost candidates for wide range of microwave applications like multilayer packages and substrates owing to the low energy required during processing and hence can pave way to the advancement of electronic materials.

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Section: Introductionmentioning

confidence: 95%

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Joseph

Varghese

Teirikangas

et al. 2018

Composites Part B: Engineering

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“…The compound exhibits also halochromic properties, i.e. colour change upon solution pH variation, induced by surface protonation (Gaudon et al (2010)). A pronounced thermosalient ("jumping crystals") effect caused by the phase transition has been also observed in CuMo 0.90 W 0.10 O 4 (Robertson et al (2015)).…”

Section: Introductionmentioning

confidence: 99%

Low temperature X-ray absorption spectroscopy study of CuMoO4 and CuMo0.90W0.10O4 using reverse Monte-Carlo method

Jonane

Cintiņš

Kalinko

et al. 2020

Radiation Physics and Chemistry

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Reversible thermochromic phase transition between αand γ-phases was studied in CuMoO 4 and CuMo 0.90 W 0.10 O 4 using X-ray absorption spectroscopy in the temperature range of 10-300 K. Reverse Monte Carlo modelling with evolutionary algorithm approach at several absorption edges simultaneously was applied to extract structural information encoded in the experimental EXAFS spectra. The obtained results show that an addition of 10 mol% of tungsten to CuMoO 4 induces local distortions in the structure and stabilizes the γ-phase, leading to an increase of the phase transition temperature by ∼50-100 K.

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Oxygen-vacancy and charge hopping related dielectric relaxation of CuMoO4 ceramic

Cao

et al. 2019

Physica B: Condensed Matter

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ChemInform Abstract: Investigation of the Chromic Phase Transition of CuMo_0.9W_0.1O₄ Induced by Surface Protonation.

Abstract: The chromic phase transition from the high‐temperature/low‐pressure form of CuMo0.9W0.1O4 (γ‐phase, red‐brown) to the low‐temperature/high‐pressure form (α‐phase, green) is induced at 25 °C by simple immersion of the powder in an acidic aqueous solution.

Cited by 4 publications

References 1 publication

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Low temperature X-ray absorption spectroscopy study of CuMoO4 and CuMo0.90W0.10O4 using reverse Monte-Carlo method

Oxygen-vacancy and charge hopping related dielectric relaxation of CuMoO4 ceramic

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