DOI: 10.1246/bcsj.44.78. Calorimetric Study of the Glassy State. VI. Phase Changes in Crystalline and Glassy-Crystalline 2,3-Dimethylbutane

Calorimetric Study of the Glassy State. VI. Phase Changes in Crystalline and Glassy-Crystalline 2,3-Dimethylbutane

10.1246/bcsj.44.78

Crossref journal-article

Oxford University Press (OUP)

Bulletin of the Chemical Society of Japan (286)

Abstract

Abstract 2,3-Dimethylbutane has two crystalline phases, high temperature form (crystal-I) and low temperature form (crystal-II). On account of the supercooling effect of crystal-I, its glassy crystalline state (non-equilibrium frozen-in state) is established below Tg (76 K) by rapid cooling. The heat capacities for various phases were determined from 13 to 300 K from principal interest in the thermodynamic properties of the glassy crystal. The transition temperature from crystal-II to crystal-I and melting point were determined to be 136.02 K and 145.05 K, respectively. The heats of transition and of fusion were determined to be 6427 J mol−1 and 788 J mol−1, respectively. From these data, the residual entropy and T2 temperature were determined to be 7.4 JK−1 mol−1 and 65 K, respectively. We also calculated the ratio of Tg to T2 for several glassy crystals known hitherto, which amounts to 1.15–1.20. The stabilization effect was studied by the measurement of the change of the configurational enthalpy in the glassy crystalline state. Also, we discovered a new meta-stable intermediate phase (crystal-III) in the course of irreversible transition from the supercooled crystal-I to crystal-II. The thermal properties of this phase were also studied and its residual entropy was determined to be 2.7 JK−1 mol−1.

Bibliography

Adachi, K., Suga, H., & Seki, S. (1971). Calorimetric Study of the Glassy State. VI. Phase Changes in Crystalline and Glassy-Crystalline 2,3-Dimethylbutane. Bulletin of the Chemical Society of Japan, 44(1), 78â89.

Authors 3

Keiichiro Adachi (first)
Hiroshi Suga (additional)
Syûzô Seki (additional)

References 34 Referenced 50

10.1246/bcsj.41.1073
10.1021/ja01170a058
10.1063/1.1742677
10.1021/ja01213a006
{'key': '2024012009063821600_r5'}
10.1063/1.1696442
{'key': '2024012009063821600_r7'}
10.1246/bcsj.38.1000
10.1246/nikkashi1948.82.24
{'key': '2024012009063821600_r10'}
10.1063/1.1695751
10.1021/ja01148a083
{'key': '2024012009063821600_r13'}
10.1016/0022-3697(61)90076-2
10.1080/15421406608083279
10.1016/0022-3697(61)90081-6
10.1088/0370-1328/91/1/320
10.1088/0370-1328/75/2/311
10.1016/0022-3697(61)90079-8
{'key': '2024012009063821600_r20'}
10.1063/1.1747060
10.1063/1.1748425
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10.1021/cr60086a003
{'key': '2024012009063821600_r25'}
10.1111/j.1151-2916.1968.tb11854.x
10.1246/bcsj.41.593
{'key': '2024012009063821600_r28'}
{'key': '2024012009063821600_r29'}
{'key': '2024012009063821600_r30'}
{'key': '2024012009063821600_r31'}
10.1088/0370-1328/84/5/310
10.1016/0022-3697(61)90083-X
10.1016/0022-3697(67)90303-4

Dates

Type	When
Created	19 years, 1 month ago (July 19, 2006, 9:28 p.m.)
Deposited	1 year, 7 months ago (Jan. 20, 2024, 4:06 a.m.)
Indexed	1 month, 3 weeks ago (July 4, 2025, 9:04 a.m.)
Issued	54 years, 7 months ago (Jan. 1, 1971)
Published	54 years, 7 months ago (Jan. 1, 1971)
Published Online	19 years, 5 months ago (March 27, 2006)
Published Print	54 years, 7 months ago (Jan. 1, 1971)

Funders 0

None

BibTeX

@article{Adachi_1971, title={Calorimetric Study of the Glassy State. VI. Phase Changes in Crystalline and Glassy-Crystalline 2,3-Dimethylbutane}, volume={44}, ISSN={1348-0634}, url={http://dx.doi.org/10.1246/bcsj.44.78}, DOI={10.1246/bcsj.44.78}, number={1}, journal={Bulletin of the Chemical Society of Japan}, publisher={Oxford University Press (OUP)}, author={Adachi, Keiichiro and Suga, Hiroshi and Seki, Syûzô}, year={1971}, month=jan, pages={78–89} }

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