Zero point oscillation energy effect on plastic deformation in solidified gases

Abstract

An investigation is made of the deformation of molecular crystals of methane and argon under the conditions of tension and stress relaxation. The Peierls barriers are shown to be the main obstacles for dislocation movement in these crystals in a wide low-temperature range. The result obtained is in good agreement with data determined for hydrogen, deuterium, and ammonium and is discussed in terms of the peculiarities of intermolecular interactions in molecular crystals. In particular, i t is shown, that the contribution of zero point oscillation energy to the bonding energy increases with decreasing temperature at which the transition from the Peierls mechanism to higher energy mechanism occurs. RccneaoBanacb nnacTmecKaR ae+opMaum MoneKympHMx KpHcTannoB MeTaHaM aproHa n p~ pacTrrmeami H penaKcauHM Hanpfimemti. YcTaHoBneHo, TO B UIM-micnoKasHB B ~T H X KpxcTannax RBJIRIOTCH 6apbepb1 natepnca. IIonyseHHbIB p e 3 y n b~a~ cosnaAaeT c HaHHmm, H J I~ Boaopoaa, HeCiTepm M aMMHaKa ti 06cyx-HynRpHbix KpxcTannax. n o~a 3 a~0 , TO YeM 6onbrrre Bmaa a~e p r~~ HynesbIx x o n e 6 a~~f i B a~e p r a m CBHBU, TeM npti 6onee ~t i 3~o f i TeMnepaType OcyuecTBnReTcn POI COM HHTepBaJIe HH3KHX TeMnepaTyp OCHOBHHMH IIpeIIRTCTBHIIMH DJIR aBtiWeHMtI IIaeTCfi B CBR3H C OCO6eHHOCTRMH MeXMOJIeKyJIRpHOrO B3aHMOHefiCTBHR B MOJIe-iIepeXOjl OT MeXaHH3Ma naPepJICa I< 6onee BbICORO3HepreTHseCKOMy MeXaHH3MY.

The Influence of Quantum Effects on the Low‐Temperature Creep of Zinc Crystals

“…I n conclusion it should be noted that the anomalies of temperature behaviour of plasticity have been observed by a number of authors also under the conditions of active deformation, both on metals [28 to 311 and on the crystals of solidified gases [32]. These authors also connect the observed peculiarities of the yield point temperature dependence a t low temperatures with the infhence of quantum effects, but a t present it is not clear whether the mechanism of this influence is similar to or different from the one suggested in the present paper.…”

Instrumented cylindrical punch indentation of solid nitrogen at 30–40 K

“…Trepp reported indentation hardness for SN 2 ice single crystals created in a liquidhelium cooled cryostat using a stainless steel 90° conical indenter 10 . Later, Leonteva et al conducted tensile testing on a variety of solid noble gas cryocrystals using a unique testing apparatus 11 . Most recently, Yamashita et al conducted unconfined compression tests on 10 mm diameter cylinders of clear solid N 2 ice 12 .…”