Temperature evolution for small particles formed during electrocrystallization

Vikarchuk, A. A.; Gamburg, Yu. D.; Yasnikov, I. S.

doi:10.1134/s1023193508070148

Cited by 6 publications

(6 citation statements)

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“…В литературе имеются работы [25][26][27][28], в которых формирование квазикристаллов с пентагональной симметрией и различных типов структуры (аморфной или совершенной кристаллической) в электроосажденных металлах объясняется достижением металлами высокотемпературного жидкофазного состояния в процессе их электроосаждения и последующим охлаждением. Так, в работах [25][26][27] по исследованию фазообразования электроосаждаемой меди показано, что « … температура в растущем островке из-за особенностей теплообмена при электрокристаллизации в определенном диапазоне размеров островка резко возрастает (при этом она может превысить температуру плавления меди) и затем падает до температуры подложки …» [27].…”

Section: результаты электронно-микроскопического исследования металловunclassified

“…Кроме того, если металлы в процессе электроосаждения будут проходить стадию высокотемпературного жидкого состояния, то отсутствие сильного переохлаждения приведет к затвердеванию этих металлов в дендритной форме, а не в сферолитной, и отсутствию пентагональных квазикристаллов. В этой связи механизм фазообразования электроосаждаемых металлов, предложенный в работах [25][26][27][28], представляется маловероятным.…”

Section: результаты электронно-микроскопического исследования металловunclassified

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Formation of spherulites and pentagonal quasicrystals in metals being electrodeposited

Girin¹,

Овчаренко²

2014

EEJET

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Section: результаты электронно-микроскопического исследования металловunclassified

Formation of spherulites and pentagonal quasicrystals in metals being electrodeposited

Girin¹,

Овчаренко²

2014

EEJET

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“…Reports are available [30][31][32][33] in which the emergence of quasicrystals with pentagonal symmetry and variety of structural types (amorphous or perfect crystalline) in an electrodeposited metal are explained by the metal's attaining of a high-temperature "liquid phase" state and subsequently cooling down during its electrodeposition. For example, some papers [30][31][32] on phase formation in electrodeposited copper show that "... the temperature in the growing islet, if its size is within a certain range, rises abruptly due to peculiarities of heat exchange in electrocrystallization (and can thus exceed copper melting point) and then drops down to the substrate temperature..." [32].…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, if metals pass a high-temperature liquid state stage during electrodeposition, they will, during solidification in the absence of a high supercooling, assume dendritic, rather than spherulitic forms and produce no pentagonal quasicrystals. In this context, the mechanism of phase formation in metals being electrodeposited as suggested in [30][31][32][33] appears unlikely.…”

Section: Resultsmentioning

confidence: 99%

Structural Features of Electrodeposited Metals as a Result of Ultra-Rapid Solidification of a Highly Supercooled Liquid Metal Phase

Girin¹

2015

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With a view to validating the existence of the phenomenon of phase formation via a liquid state stage in metals being electrodeposited, experiments were carried out to reveal electrodeposited metal's structural features typical of metals produced by solidification at ultra-high rates under high supercooling, and to establish consistent changes in metal structural characteristics with increasing degree of supercooling in electrodeposition. Following experimental facts in favour of the existence of the phenomenon in point were found: (1) occurrence of spherulites and pentagonal quasicrystals in electrodeposit layers adjoining the cathode, the occurrence being typical of metals produced by ultra-rapid solidification of a highly supercooled liquid metal phase; (2) emergence of the electrodeposited metals solely in a spherulitic form when transition of spherulitic growth to drusy growth with increasing deposit thickness was prevented; and (3) regular change in characteristics of point, linear and planar defects in the crystalline lattice with increasing degree of supercooling in electrodeposition of metals.

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“…More recently, literature sources became available [84][85][86] that explain the occurrence of pentagonal quasicrystals and various other types of structure, like amorphous or ideal crystalline, by the metals achieving a high-temperature "liquid-phase" state and subsequently 79 cooling in the process of electrodeposition. Some of the studies dealing with phase formation in copper electrodeposition 84,85 assert that "...owing to the specific features of the heat exchange during electrocrystallization, the temperature of a growing island in a particular range of island sizes increases abruptly (and can even exceed the melting temperature of copper) and then decreases to the substrate temperature."…”

Section: First Principal Hypothesismentioning

confidence: 99%

Review—Electrochemical Phase Formation via a Supercooled Liquid State Stage: Metastable Structures and Intermediate Phases

Girin

2022

J. Electrochem. Soc.

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A review of experimental works proving the existence of the phenomenon of the electrochemical phase formation in metals and alloys via a supercooled liquid state stage is presented. The research findings focused on the electrochemical formation of metastable structures and intermediate phases, as well as on the structural features accompanying them. Electrochemical amorphous phase formation in metals and alloys, electrochemical quasicrystalline phase formation in metals, and electrochemical polymorphic phase formation in metals are discussed. Electrochemical hydrogen-related structure formation in metals, electrochemical high-defect crystalline phase formation in metals, and electrochemical texture-inhomogeneous structure formation in metals are considered. Electrochemical formation of intermediate phases in metals and alloys, electrochemical formation of eutectics in metallic alloys, and electrochemical formation of chemical compounds at the metallic cathode/electrodepositing metal interface are analyzed. Electrochemical reduction of ions in metals and alloys at a liquid cathode versus a solid chemically identical one, electrochemical phase formation of metals at chemically identical solid or liquid cathode, and electrochemical phase formation of alloys at chemically identical solid or liquid cathode are discussed.

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Temperature evolution for small particles formed during electrocrystallization

Cited by 6 publications

References 0 publications

Formation of spherulites and pentagonal quasicrystals in metals being electrodeposited

Formation of spherulites and pentagonal quasicrystals in metals being electrodeposited

Structural Features of Electrodeposited Metals as a Result of Ultra-Rapid Solidification of a Highly Supercooled Liquid Metal Phase

Review—Electrochemical Phase Formation via a Supercooled Liquid State Stage: Metastable Structures and Intermediate Phases

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