Pressure-induced crystal–amorphous transformation in Y2Mo3O12

Dias, A. C.; Luz-Lima, C.; Paraguassu, W.; Silva, K. Pereira da; Freire, Paulo; Filho, J. Mendes; Marinković, Bojan A.; Miller, Kimberly J.; White, Mary Anne; Filho, A. G. Souza

doi:10.1016/j.vibspec.2013.08.004

Cited by 22 publications

(10 citation statements)

References 24 publications

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“…This reduction in unit cell volume was much higher than expected based on the compressibility of other orthorhombic A 2 Mo 3 O 12 compounds, and suggested that a transition to the structurally related higher density P2 1 /a polymorph may have occurred below 0.13 GPa. This agrees with a previous Raman study by Torres Dias et al (2013), which suggested that Pbcn-Y 2 Mo 3 O 12 underwent a transition to a lower symmetry phase below 0.3 GPa. It is not surprising that this transition would occur at such a low pressure, as previous studies have shown that Sc 2 W 3 O 12 (Garg et al, 2005a; Varga et al, 2005b, 2006; Cetinkol et al, 2008), Sc 2 Mo 3 O 12 (Varga et al, 2005a) and Al 2 W 3 O 12 (Varga et al, 2005a) behave similarly and undergo this transition at 0.3 GPa, 0.25 GPa and 0.1 GPa, respectively.…”

Section: Resultssupporting

confidence: 93%

“…In contrast, the Cr 2 Mo 3 O 12 peaks start to become progressively diffuse above 5.5 GPa (scan 54), indicating the onset of disorder or amorphization. Many NTE materials have been reported to amorphize under pressure (Huang, 1998; Perottoni and da Jornada, 1998; Garg et al, 2001, 2005b; Liu et al, 2001, 2002; Secco et al, 2001, 2002a,b; Arora et al, 2004, 2005; Karmakar et al, 2004; Mukherjee et al, 2004; Paraguassu et al, 2004; Varga et al, 2005b; Gates et al, 2006; Keen et al, 2007; Catafesta et al, 2008; Cetinkol et al, 2009; Baiz et al, 2012; Torres Dias et al, 2013; Salke et al, 2018), especially under non-hydrostatic conditions, as their open frameworks allow for volume-reducing rotations of the constituent polyhedra. Under non-hydrostatic pressure, such random reorientations can become “frozen in” at relatively low pressures, resulting in progressive loss of long range order.…”

Section: Resultsmentioning

confidence: 99%

“…Generally, at least one additional phase transition occurs at higher pressures between 1 and 4 GPa. Amorphization is commonly reported, which can be reversible or irreversible and shows onsets as low as 2.3 GPa or higher than 10 GPa (Garg et al, 2001, 2005a,b; Secco et al, 2001, 2002a,b; Liu et al, 2002; Arora et al, 2004, 2005; Karmakar et al, 2004; Mukherjee et al, 2004; Paraguassu et al, 2004; Varga et al, 2005a; Gates et al, 2006; Baiz et al, 2012; Torres Dias et al, 2013). Table 1 summarizes the current literature on high pressure behavior of A 2 Mo 3 O 12 compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Y 2 Mo 3 O 12 adopts the orthorhombic structure at all temperatures, and shows NTE with α l = −9.0 × 10 −6° C −1 from −253 to 177 °C (Marinkovic et al, 2009). No previous high pressure studies on chromium molybdate exist, while yttrium molybdate has been investigated by low resolution diffraction studies by our group and Raman spectroscopy by Torres Dias (Gates, 2008; Torres Dias et al, 2013). Our previous low resolution diffraction data showed no evidence of phase transitions until irreversible amorphization occurred at 2.3 GPa.…”

Section: Introductionmentioning

confidence: 99%

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High Pressure Behavior of Chromium and Yttrium Molybdate (Cr2Mo3O12, Y2Mo3O12)

2018

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The high pressure behavior of negative thermal expansion materials continues to be of interest, as their potential use in controlled thermal expansion composites can be affected by irreversible pressure-induced phase transitions. To date, it is not possible to predict the high pressure behavior of these compounds, necessitating measurements on each composition. In this work, high pressure synchrotron powder X-ray diffraction studies of Cr2Mo3O12 and Y2Mo3O12 were conducted in a diamond anvil cell. Chromium molybdate, which adopts the monoclinic P21/a structure under ambient conditions, was found to not undergo any crystalline-crystalline transitions up to 8.9 GPa. The orthorhombic ambient pressure polymorph of yttrium molybdate was found to undergo a phase transition to the monoclinic P21/a scandium tungstate structure below 0.13 GPa. This structure is frequently observed for related materials at low temperatures, but has never been reported for Y2Mo3O12. No additional changes in this material were observed up to 4.9 GPa. The fact that the monoclinic polymorphs of these materials do not undergo phase transitions within the studied pressure range makes them unique among A2M3O12 materials, as most isostructural compositions undergo at least one phase transition to crystalline high pressure phases.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Pressure Behavior of Chromium and Yttrium Molybdate (Cr2Mo3O12, Y2Mo3O12)

2018

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“…A summary of the experiments performed and the temperature ranges of measurement is provided in Table S1 99.5%) were mixed and mechanically activated 2 in a highenergy ball mill for 12 h using stabilized zirconia grinding media and a steel ball mill. The resulting precursor powder was pressed into pellets using a cylindrical die (15 mm diameter) under ca.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Zero Thermal Expansion in ZrMgMo₃O₁₂: NMR Crystallography Reveals Origins of Thermoelastic Properties

et al. 2015

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ABSTRACT:The coefficient of thermal expansion of ZrMgMo 3 O 12 has been measured and was found to be extremely close to zero over a wide temperature range including room temperature (α = (1.6 ± 0.2) × 10 −7 K −1 from 25 to 450°C by X-ray diffraction (XRD)). ZrMgMo 3 O 12 belongs to the family of AMgM 3 O 12 materials, for which coefficients of thermal expansion have previously been reported to range from low-positive to low-negative. However, the low thermal expansion property had not previously been explained because atomic position information was not available for any members of this family of materials. We determined the structure of ZrMgMo 3 O 12 by nuclear magnetic resonance (NMR) crystallography, using 91 Zr, 25 Mg, 95 Mo, and 17 O magic angle spinning (MAS) and 17 O multiple quantum MAS (MQMAS) NMR in conjunction with XRD and density functional theory calculations. The resulting structure was of sufficient detail that the observed zero thermal expansion could be explained using quantitative measures of the properties of the coordination polyhedra. We also found that ZrMgMo 3 O 12 shows significant ionic conductivity, a property that is also related to its structure.

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Pressure-induced structural transformations in In_2-x Y_x (MoO₄ )₃ systems

Paraguassu

Filho

Marinković

et al. 2015

J. Raman Spectrosc.

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In this work, we report results of high‐pressure Raman experiments (P < 8 GPa) on In2‐xYxMo3O12 for x = 0.0 and 0.5. A crystalline to crystalline structural phase transition and pressure‐induced amorphization (PIA) have been identified. The structural phase transition takes place at 1.5 and 1.0 GPa for In2(MoO4)3 and In1.5Y0.5(MoO4)3, respectively, resulting in the change of structure from monoclinic P21/a to a more denser structure. The PIA started at 5 and 3.4 GPa for In2Mo3O12 and In1.5Y0.5Mo3O12, respectively. The amorphization process takes place in two stages in the case of In1.5Y0.5Mo3O12 phase, while for In2Mo3O12, it is not complete until the pressure is as high as 7 GPa. Our results also suggest that with increase of ionic size of the A3+ ions, the octahedral distortion increases and consequently larger local structural disorder is introduced in the A2(MoO4)3 system, where A is a trivalent ion (In, Y3+, Sc3+, Fe3+, etc.). Copyright © 2015 John Wiley & Sons, Ltd.

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Pressure-induced crystal–amorphous transformation in Y2Mo3O12

Cited by 22 publications

References 24 publications

High Pressure Behavior of Chromium and Yttrium Molybdate (Cr2Mo3O12, Y2Mo3O12)

High Pressure Behavior of Chromium and Yttrium Molybdate (Cr2Mo3O12, Y2Mo3O12)

Zero Thermal Expansion in ZrMgMo₃O₁₂: NMR Crystallography Reveals Origins of Thermoelastic Properties

Pressure-induced structural transformations in In_2-x Y_x (MoO₄ )₃ systems

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Pressure-induced crystal–amorphous transformation in Y2Mo3O12

Cited by 22 publications

References 24 publications

High Pressure Behavior of Chromium and Yttrium Molybdate (Cr2Mo3O12, Y2Mo3O12)

High Pressure Behavior of Chromium and Yttrium Molybdate (Cr2Mo3O12, Y2Mo3O12)

Zero Thermal Expansion in ZrMgMo3O12: NMR Crystallography Reveals Origins of Thermoelastic Properties

Pressure-induced structural transformations in In2-x Yx (MoO4 )3 systems

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Product

Resources

About

Zero Thermal Expansion in ZrMgMo₃O₁₂: NMR Crystallography Reveals Origins of Thermoelastic Properties

Pressure-induced structural transformations in In_2-x Y_x (MoO₄ )₃ systems