Thermosonimetry of the phase II/III transition of hexachloroethane

Lee, Oliver; Koga, Yoshikata; Wade, Adrian P.

doi:10.1016/0039-9140(90)80245-b

Cited by 14 publications

(15 citation statements)

References 10 publications

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“…Finally, it would be naïve to expect an essentially macroscopic description, as 'nucleation-and-growth' inevitably is, to reproduce all the complexities of a transition from one phase to another. Some idea of these complexities can be obtained from a thermosonometric study of the EII-(III) to EI-(II) phase transition in hexachloroethane (cooling monoclinic to orthorhombic) at 317 K (Lee et al, 1990). Short duration acoustic signals of frequencies up to 1000 kHz were emitted during the phase transition.…”

Section: Figure 43mentioning

confidence: 99%

On the mechanism of some first-order enantiotropic solid-state phase transitions: from Simon through Ubbelohde to Mnyukh

Herbstein

2006

Acta Crystallogr B Struct Sci

118

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The first (so-called) lambda transition in solids was found in the specific heat measurements for NH(4)Cl at 242 K by F. Simon in 1922 [Simon (1922). Ann. Phys. 68, 241-280]. Analogous phenomena found in many other solids gave rise to doubts (expressed most clearly by A. R. Ubbelohde some 50 years ago) about the applicability of classical thermodynamics to some phase transitions [Ubbelohde (1956). Brit. J. Appl. Phys. 7, 313-321]. However, Y. Mnyukh's studies of enantiotropic phase transitions in eight organic crystals showed that all proceed by a nucleation-and-growth mechanism [summarized in Mnyukh (2001), Fundamentals of Solid State Phase Transitions, Ferromagnetism and Ferroelectricity. 1st Books]. Nucleation is localized at defects in the parent phase; growth can be epitaxic and oriented if parent and daughter phases have closely similar structures, or random (not oriented) if there are substantial structural differences. This conclusion is supported by a critical review of Mnyukh's eight examples and other results published in the interim. It seems that Ubbelohde's invocation of "hybrid crystals" and "smeared transitions" can mostly be accounted for by lack of equilibrium in the phase-transition studies cited by him. However, the intermediate phase in 4,4'-dichlorobenzophenone appears to have structural resemblances to Ubbelohde's' "hybrid crystal".

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Section: Figure 43mentioning

confidence: 99%

On the mechanism of some first-order enantiotropic solid-state phase transitions: from Simon through Ubbelohde to Mnyukh

Herbstein

2006

Acta Crystallogr B Struct Sci

118

View full text Add to dashboard Cite

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“…Emission occurs not only in the audible region (~ 10 Hz to [16][17][18][19][20], but also in the ultrasonic range (above 20 kHz). Acoustic emissions are elastic waves generated by a rapid release of energy at a localized source; they are associated with bonding and reactivity.…”

Section: Historical Contextmentioning

confidence: 99%

“…The frequency response of piezoelec tric sensors is typically not flat (16), and devices with specific resonant frequencies and high immunity to ambient audible noise are widely The frequency response of piezoelec tric sensors is typically not flat (16), and devices with specific resonant frequencies and high immunity to ambient audible noise are widely …”

Section: Experimental Considerationsmentioning

confidence: 99%

“…Recent chemical AE studies have focused on general investigation of the AE phenomenon (9,(28)(29)(30), thermosonimetry (16,31,32), instrument development (19,33), analysis of frequency domain information (14,15), Figure 3. AE signal and five parameters used by materials scientists to describe its waveform.…”

Section: Applicationsmentioning

confidence: 99%

“…chemometric methods for character ization and separation of signals (21,34), quantitative analysis (15,23), and use of AE as a kinetic (21,35) and mechanistic (15,16,22) probe.…”

Section: Reportmentioning

confidence: 99%

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