Organic acids under pressure: elastic properties, negative mechanical phenomena and pressure induced phase transitions in the lactic, maleic, succinic and citric acids

Colmenero, Francisco Jiménez

doi:10.1039/d0ma00019a

Cited by 28 publications

(26 citation statements)

References 428 publications

(327 reference statements)

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“…Several easy high-yielding synthetic procedures [23,26,28,[37][38] are known and, therefore, silver oxalate is a compound with large availability. The simplicity and availability of this compound suggest that the search of NLC materials should cover also common materials [12,[15][16]18,39]. The presence of silver in several well-known NLC materials [40][41][42][43] is noteworthy.…”

Section: Introductionmentioning

confidence: 99%

Negative area compressibility in silver oxalate

Colmenero

Jiang

et al. 2020

J Mater Sci

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The presence of extremely large negative linear compressibilities (NLC) in crystalline silver oxalate was discovered in a recent work by using first principles solid-state calculations. Although the minimum value of the NLC was found for a negative applied hydrostatic pressure, in this work the presence of NLC in this material for positive applied pressures is verified experimentally by means of high pressure X-ray diffraction experiments performed at room temperature in the Beijing Synchrotron Radiation Facility (BSRF). The results of this study demonstrate with certainty that the compressibility of silver oxalate along [010] crystallographic direction is negative for applied pressures in the range from 0.0 to 0.85 GPa. Since the measured compressibility decreases largely as the pressure decreases, large negative values of the compressibility are expected for negative applied pressures in agreement with the results found using first principles methods. Furthermore, the analysis of the variation of the lattice parameters of the crystal structure of silver oxalate under pressure in the principal axes reference system, revealed that this material also exhibits the largest negative area compressibility phenomenon found so far at zero pressure, the values of the compressibilities along two of the principal axes being −16.7 and −20.0 TPa −1 . The negative compressibility phenomenon in silver oxalate can be rationalized in terms of a "chains of rotating parallelograms" structural model.

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Section: Introductionmentioning

confidence: 99%

Negative area compressibility in silver oxalate

Colmenero

Jiang

et al. 2020

J Mater Sci

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“…The last one, among others, focuses the attention on the mechanical properties of molecular crystals [19][20][21][22][23][24][25] and metal-organic complexes [26][27][28]. Several dozens of organic crystals show anomalous plasticity and elasticity at ambient and extreme conditions under mechanical stress [29][30][31][32][33]. L-Leucinium hydrogen maleate (LLHM) is a unique example of organic crystals that preserves plasticity at a cryogenic temperature [34].…”

Section: Introductionmentioning

confidence: 99%

Low Temperature and High-Pressure Study of Bending L-Leucinium Hydrogen Maleate Crystals

Skakunova

Rychkov

2021

Crystals

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The polymorphism of molecular crystals is a well-known phenomenon, resulting in modifications of physicochemical properties of solid phases. Low temperatures and high pressures are widely used to find phase transitions and quench new solid forms. In this study, L-Leucinium hydrogen maleate (LLHM), the first molecular crystal that preserves its anomalous plasticity at cryogenic temperatures, is studied at extreme conditions using Raman spectroscopy and optical microscopy. LLHM was cooled down to 11 K without any phase transition, while high pressure impact leads to perceptible changes in crystal structure in the interval of 0.0–1.35 GPa using pentane-isopentane media. Surprisingly, pressure transmitting media (PTM) play a significant role in the behavior of the LLHM system at extreme conditions—we did not find any phase change up to 3.05 GPa using paraffin as PTM. A phase transition of LLHM to amorphous form or solid–solid phase transition(s) that results in crystal fracture is reported at high pressures. LLHM stability at low temperatures suggests an alluring idea to prove LLHM preserves plasticity below 77 K.

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“…157 It has been extensively utilized for the computation of the elastic response of many solid materials. 93,[96][97][98][99][100][101][102]116,118,[121][122][124][125][158][159][160][161][162] The tridimensional representations of the mechanical properties as a function of the direction of the applied strain for the six uranyl carbonate minerals studied in this work were obtained using the ElAM code. 163 The crystal structures of the minerals studied were fully optimized under the effect of seventeen different external isotropic pressures with values in the range −1.0 to 9.0 GPa.…”

Section: Theoretical Solid-state Methodsmentioning

confidence: 99%

The crystal structures and mechanical properties of the uranyl carbonate minerals roubaultite, fontanite, sharpite, widenmannite, grimselite and čejkaite

Colmenero

Plášil

Sejkora

2020

Inorg. Chem. Front.

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Organic acids under pressure: elastic properties, negative mechanical phenomena and pressure induced phase transitions in the lactic, maleic, succinic and citric acids

Abstract: The behavior under pressure of the lactic, maleic, succinic and citric acids is studied using first principles methods. The four acids exhibit NLC effects due to the onset of pressure induced phase transitions or sudden structural rearrangements.

Cited by 28 publications

References 428 publications

Negative area compressibility in silver oxalate

Negative area compressibility in silver oxalate

Low Temperature and High-Pressure Study of Bending L-Leucinium Hydrogen Maleate Crystals

The crystal structures and mechanical properties of the uranyl carbonate minerals roubaultite, fontanite, sharpite, widenmannite, grimselite and čejkaite

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