Automation of Crystal Growth from Melt

Winkler, J.; Neubert, Michael

doi:10.1016/b978-0-444-63303-3.00028-6

Cited by 3 publications

(2 citation statements)

References 147 publications

(159 reference statements)

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“…By using dislocation-free seeds the answer lies in Indenbom's theoretical concept whereupon it could be realized at nearly homogeneous temperature fields but also curved ones when they are approximable by a sum of harmonic polynoms (see above). Of course, this proves to be of considerable experimental challenge and could be only solved by applying highly modern temperature controlling systems such as model-based automation of each step of the whole crystal growth process [62]. …”

Section: ( )mentioning

confidence: 99%

Fundamentals and engineering of defects

Rudolph

2016

Progress in Crystal Growth and Characterization of Materials

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Section: ( )mentioning

confidence: 99%

Fundamentals and engineering of defects

Rudolph

2016

Progress in Crystal Growth and Characterization of Materials

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“…In this study, we synthesize the free-standing single-crystalline M2-phase VO2 NWs stable at room temperature under a unique growth condition. High temperature and low Ar gas carrier flux are controlled to achieve rapid NW growth rate, introduce oxygen interstitial growth defects [25,26], modify the oxygen stoichiometry, and consequently modulate the phase. No extra oxygen is supplied intentionally during the whole synthetic process to successfully avoid the formation of other vanadium oxides.…”

Section: Introductionmentioning

confidence: 99%

Achieving room-temperature M2-phase VO2 nanowires for superior thermal actuation

et al. 2021

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Vanadium dioxide (VO2) has emerged as a promising micro-actuator material for its large amplitude and high work density across the transition between the insulating (M1 and M2) and metallic (R) phase. Even though M2-R transition offers about 70% higher transformation stress than M1-R structural phase transition, the application of the M2 phase in the micro-actuators is hindered by the fact that previously, M2 phase can only stay stable under tensile stress. In this work, we propose and verify that by synthesizing the VO2 nanowires under optimized oxygen-rich conditions, stoichiometry change can be introduced into the nanowires (NWs) which in turn yield a large number free-standing single-crystalline M2-phase NWs stable at room temperature. In addition, we demonstrate that the output stress of the M2 phase NWs is about 65% higher than that of the M1-phase NWs during their transition to R phase, quite close to the theoretical prediction. Our findings open new avenues towards enhancing the performance of VO2-based actuators by using M2-R transition.

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