Solid—solid phase transitions determined by differential scanning calorimetry part IV. New transitions in tetrahedral substances

Murrill, E.; Whitehead, M. E.; Breed, L. W.

doi:10.1016/0040-6031(72)80008-x

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…A sample of 2,2-dimethyl-1-propanol (about 3.76 g was used) was measured on a CALVII calorimeter from 5 K to 380 K. A solid II to solid I phase transition appeared at 233.34 K, and a solid I to liquid phase transition appeared at 328.15 K (see Table 3). A large difference between temperature and enthalpy of phase transition determined in this work and reported by Murrill et al 11 (see Table 3) may be attributed to impurities in the Murrill sample.…”

Section: 2-dimethyl-1-propanolsupporting

confidence: 48%

Heat Capacities in the Solid and in the Liquid Phase of Isomeric Pentanols

et al. 2007

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Isobaric heat capacities in the liquid and in the solid phases of seven isomeric pentanols were measured by adiabatic calorimetry. Results obtained cover the following temperature ranges: 2-methyl-1-butanol from 85 K to 301 K; 2-methyl-2-butanol from 84 K to 301 K; 3-methyl-1-butanol from 79 K to 158 K; 3-methyl-2-butanol from 85 K to 301 K; 2,2-dimethyl-1-propanol from 6 K to 381 K; 2-pentanol from 80 K to 301 K; and 3-pentanol from 5 K to 309 K. The temperature and enthalpy of phase transition were also determined. Solid to solid and solid to liquid phase transitions were detected for 2-methyl-2-butanol and for 2,2-dimethyl-1-propanol, and a solid to liquid phase transition was detected for 3-pentanol. Only a glass to liquid phase transition was detected for all the remaining compounds. The heat capacity data in the liquid phase obtained in this work were merged with available experimental data from the literature and critically assessed, and sets of recommended data were developed by correlating selected data as a function of temperature.

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Section: 2-dimethyl-1-propanolsupporting

confidence: 48%

Heat Capacities in the Solid and in the Liquid Phase of Isomeric Pentanols

et al. 2007

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“…Several studies regarding the phase transition properties and crystallographic properties of PCs and their mixtures have been carried out for many years [10,[16][17][18][19][20]. However, to the best of our knowledge, fundamental features to evaluate their actual use in TES applications (e.g., thermophysical properties, thermal stability, cycling stability, cost analysis) were not deeply analyzed.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties of Alternative Phase Change Materials for Solar Thermal Applications

Tomassetti¹,

Luzi²,

Peng³

et al. 2023

IJHT

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Phase change materials (PCMs) with a solid-solid phase transition are receiving increasing attention as promising materials for thermal energy storage (TES) systems. Unlike the more well-known and widespread solid-liquid PCMs, they generally have negligible volume change during phase transition, no contamination, and long cyclic life. Among the most studied solid-solid PCMs, a group of organic materials known as plastic crystals and their mixtures seem to show energy storage properties suitable for solar thermal systems at low-medium temperatures (80-150℃). In this study, to deeply analyze their suitability for these applications, the thermophysical properties and thermal stability of two promising plastic crystals, pentaerythritol (PE) and pentaglycerine (PG), and their mixture are reviewed. The phase transition properties of these two pure substances were also assessed in this study through differential scanning calorimetry (DSC). The experimental measurements showed good agreement with the data collected from literature. The analysis showed that various properties and characteristics of these materials should be further investigated since a limited number of studies related to their properties is available. However, if their drawbacks are adequately addressed, the studied plastic crystals seem suitable for TES applications.

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“…Hydrogen bonded molecular polyalcohol crystals such as neopentylglycol (NPG) [HOCH 2 C(CH 3 ) 2 CH 2 OH] are potential candidates for thermal energy storage materials (Murrill and Breed, 1970and 1972, and also Benson et al, 1986. These are classified as "plastic crystals" and have a large entropy of solid-solid phase transition and a very low entropy of fusion (Timmermann, 1961).…”

Section: Introductionmentioning

confidence: 99%

Low- and high-temperature structures of neopentylglycol plastic crystal

Chandra

Day²,

Barrett

1993

Powder Diffr.

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Plastic crystals, such as neopentylglycol, 2, 2-dimethyl-1,3-propanediol, that exhibit polymorphic behavior are emerging materials for thermal energy storage. The energy is stored isothermally in the γ phase, FCC, during solid-state phase transformations. This γ phase of NPG has been determined as an orientational disordered phase. The low temperature α phase structure, which is of great significance in the evaluation of lattice expansions and other parameters, was first determined in 1961. However, the reported unit cell dimensions and the intensities of the reflections led to erroneous indexing of the powder patterns in binary systems. The α phase structure is redetermined here as monoclinic, M= 104.15 amu, space group P21/n (an alternate setting of , space group No. 14), a = 5.979(1)Å, b= 10.876(2)Å, c=10.099(2)Å, β=99.78(1)°, V=647.2(2)Å3 at 20°(± 1)C, Dx= 1.069 g cm s−3 for Z=4. In this paper the redetermined structure of the α phase of NPG is presented in projections of the atomic positions, in tables, and in calculated powder pattern and these results are compared with those reported by others. The powder patterns obtained from the Bragg–Brentano diffractometer are compared with our calculated pattern from the single crystal data. The structural parameters of the high temperature phase of NPG as determined by a Guinier diffraction system are also reported.

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Solid—solid phase transitions determined by differential scanning calorimetry part IV. New transitions in tetrahedral substances

Cited by 8 publications

References 9 publications

Heat Capacities in the Solid and in the Liquid Phase of Isomeric Pentanols

Heat Capacities in the Solid and in the Liquid Phase of Isomeric Pentanols

Thermal Properties of Alternative Phase Change Materials for Solar Thermal Applications

Low- and high-temperature structures of neopentylglycol plastic crystal

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