On the nature of amorphous-to-amorphous and crystal-to-amorphous transitions under high pressure

Бражкин, В. В.; Lyapin, A. G.; Stal’gorova, O. V.; Gromnitskaya, E. L.; Попова, С. В.; Tsiok, O. B.

doi:10.1016/s0022-3093(96)00559-5

Cited by 30 publications

(26 citation statements)

References 20 publications

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“…The quantitative analysis of density and shear modules showed that the content of these impurities did not exceed 30 %. In any case, the Ma phase has the positive value of dG/dP derivative [12,16], while 1 c or 1h ices have the significantly less absolute value of dGIdP derivative [8,12,16] than that observed for the dda phase (Fig. 3).…”

Section: Introductionmentioning

confidence: 85%

“…The data in Fig.2 point out that the shear instability plays an important role in the transition mechanism. Apporoximately a half of the shear modulus change is observed before any significant volume jump in contrast to the Ihhda transition, where the volume and shear modules changes start simultaneously [16]. The origin of such different behavior seems to be connected with the above mentioned local atomic configuration heterogeneity in the amorphous network.…”

Section: Introductionmentioning

confidence: 92%

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Elastic Softening of Amorphous H2O Network prior to the hda-lda Transition in Amorphous State.

Бражкин

Gromnitskaya

Stal’gorova

et al. 1998

THE REVIEW OF HIGH PRESSURE SCIENCE AND TECHNOLOGY

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 92%

Elastic Softening of Amorphous H2O Network prior to the hda-lda Transition in Amorphous State.

Бражкин

Gromnitskaya

Stal’gorova

et al. 1998

THE REVIEW OF HIGH PRESSURE SCIENCE AND TECHNOLOGY

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“…The amorphization induced at high pressure is not a thermodynamic phase transition but rather a disruption of the crystal lattice due to its mechanical instability. Recently, it has been shown that the P-¹ kinetic lines for amorphization can be extrapolated to the ordinary crystal-to-crystal hysteresis lines at high temperatures (11). In consequence, one finds that the P-¹ diagrams of amorphous phases are similar to the phase diagrams of the corresponding crystalline counterparts (12).…”

Section: Introductionmentioning

confidence: 99%

Pressure-Induced Amorphization of GeSe2

Grzechnik

Grande

Stølen

1998

Journal of Solid State Chemistry

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“…ecent studies of amorphous materials have revealed that more than one distinct amorphous phase can be formed from the same substance, a phenomenon that is called amorphous polymorphism (1)(2)(3)(4). The nature of amorphous-toamorphous transition induced by pressure has been a topic of considerable research activity in several substances, e.g., ice, silicon, silica, and carbon (5)(6)(7)(8)(9)(10)(11)(12)(13).…”

mentioning

confidence: 99%

Anomalous compression behavior in lanthanum/cerium-based metallic glass under high pressure

Zeng

Feng

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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In situ high-pressure x-ray diffraction, low-temperature resistivity, and magnetization experiments were performed on a La 32Ce32Al16Ni5Cu15 bulk metallic glass (BMG). A sudden change in compressibility at Ϸ14 GPa and a rapid increase of resistivity at Ϸ12 K were detected, whereas magnetic phase transformation and magnetic field dependence of the low-temperature resistivity do not occur at temperatures down to 4.2 K. An interaction between conduction electrons and the two-level systems is suggested to explain the temperature and field dependences of resistivity of the BMG alloy. Although the cause of the unusual change in compressibility at Ϸ14 GPa is not clear, we believe that it could be linked with the unique electron structure of cerium in the amorphous matrix. An electronic phase transition in BMG alloys, most likely a second-order amorphous-to-amorphous phase transition, is suggested.bulk metallic glass ͉ phase transition R ecent studies of amorphous materials have revealed that more than one distinct amorphous phase can be formed from the same substance, a phenomenon that is called amorphous polymorphism (1-4). The nature of amorphous-toamorphous transition induced by pressure has been a topic of considerable research activity in several substances, e.g., ice, silicon, silica, and carbon (5-13). All these reports have encouraged the search for polymorphic phase transitions in liquids and glasses (14-19). Bulk metallic glasses (BMGs) as a new kind of amorphous material with a maximum size up to Ϸ70 mm in diameter and wide supercooled liquid regions have been fabricated in the last decade (20,21). To the best of our knowledge, evidence for an amorphous-to-amorphous phase transition has rarely been reported in metallic glasses. Very recently, parallel to our work, Sheng et al. (22) reported similar amorphous-toamorphous phase transition in a binary CeAl metallic glass ribbon sample.For decades, both structural and electronic transitions in pure elemental cerium and its crystalline alloys have been intensively investigated. Cerium, which is the first element in the lanthanide series with one 4f electron, has a complex phase diagram. Depending on pressure and temperature, it can be either a paramagnet, an antiferromagnet, or a superconductor. Cerium is also the only pure element to exhibit a solid-solid critical point in the well known ␥ N ␣ isostructural phase transition (23, 24). Many cerium-bearing alloys are heavy-fermion compounds and have anomalous low-temperature resistivity and magnetization behaviors that are relevant to Kondo coupling (25, 26) and also have first-order phase transitions resembling the ␥ N ␣ phase transition for pure cerium or second-order phase transitions above a critical point (27). Recently, a LaCe-based BMG with a maximum size up to 10 mm (28) and a La-based BMG with a maximum size up to 20 mm were developed (29). An interesting question has been raised: Do LaCe-based BMGs have electronic phase transitions similar to pure cerium and its crystalline alloys?In this work, we report...

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On the nature of amorphous-to-amorphous and crystal-to-amorphous transitions under high pressure

Cited by 30 publications

References 20 publications

Elastic Softening of Amorphous H2O Network prior to the hda-lda Transition in Amorphous State.

Elastic Softening of Amorphous H2O Network prior to the hda-lda Transition in Amorphous State.

Pressure-Induced Amorphization of GeSe2

Anomalous compression behavior in lanthanum/cerium-based metallic glass under high pressure

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