Anisotropy effects on fracto-emission from MgF2 single crystals

Yoo, K. C.; Rosemeier, R. G.; Dickinson, J. T.; Langford, S. C.
July 1989
Applied Physics Letters;7/24/1989, Vol. 55 Issue 4, p354
Academic Journal
An important component of fracto-emission is the emission of electrons (EE) accompanying the fracture of materials. In this letter we present measurements of EE accompanying the fracture of MgF2 single crystals loaded in three-point bend. In particular, we examine the effect of changing the crystal orientation relative to the loading direction on emission intensity. We find that fracture surfaces with different crystal orientations yield significantly different EE. We propose that this is due to differences in the density of defects produced by such a fracture.


Related Articles

  • Anisotropy of the Plastic Deformation and Fracture Processes in a Dynamically Loaded Crystallite. Zol�nikov, K. P.; Uvarov, T. Yu.; Psakh�e, S. G. // Technical Physics Letters;Apr2001, Vol. 27 Issue 4, p263 

    The influence of anisotropic dynamic loading on the character of plastic deformation and fracture processes in a crystallite near the free surface was studied by methods of molecular dynamics. It was established that there are threshold deformation levels determining the opening of a seeding...

  • Influence of crystallographic anisotropy on the Hopkinson fracture “spallation” of zirconium. Gray, G. T.; Bourne, N. K.; Zocher, M. A.; Maudlin, P. J.; Millett, J. C. F. // AIP Conference Proceedings;2000, Vol. 505 Issue 1, p509 

    The influence of texture on the spallation (Hopkinson fracture) of low-symmetry metals (e.g. Zr, U, or Sn) has seen limited study. In this study, the Hopkinson fracture of annealed, high-purity Zr has been probed as a function of crystallographic texture. The quasi-static yield strength of the...

  • Microhardness Anisotropy and the Indentation Size Effect in Single Crystal Magnesium Fluoride, MgF2. Lei Zhang; Bradt, Richard C. // Physical Review & Research International;2014, Vol. 4 Issue 1, p40 

    The Knoop microhardness anisotropy profile was determined on the (001) of MgF2 which has microhardness maxima in the <110> and minima in the <100>. This anisotropy is the same as TiO2 and SnO2 which also have the rutile crystal structure. This indicates that the slip systems are the same for...

  • Transmissive properties of Ag/MgF[sub 2] photonic band gaps. Bloemer, Mark J.; Scalora, Michael // Applied Physics Letters;4/6/1998, Vol. 72 Issue 14 

    We present results of transmittance measurements on periodic layers of Ag/MgF[sub 2] at optical and microwave frequencies. These one-dimensional, photonic band gap materials exhibit transparency bands at optical frequencies and a huge stop band that extends throughout the near-IR to microwave...

  • Microcracking in calcite and dolomite marble: microstructural influences and effects on properties. Shushakova, Victoria; Fuller, Edwin; Siegesmund, Siegfried // Environmental Earth Sciences;Jun2013, Vol. 69 Issue 4, p1263 

    Microstructure-based finite-element analysis with a microcracking algorithm was used to simulate an actual degradation phenomenon of marble structures, i.e., microcracking. Both microcrack initiation and crack propagation were characterized, as were their dependence on lattice preferred...

  • CaF2, MgF2, SiO2, Al2O3, SiC, LiF, BaF2, and ZrO2 optical single crystals used in studies in the VUV spectral region. Gerasimova, N. // Instruments & Experimental Techniques;May2006, Vol. 49 Issue 3, p408 

    Spectral characteristics of single crystals—fluorite, magnesium fluoride, quartz, sapphire, silicon carbide, lithium fluoride, barium fluoride, and fianite—used as materials for optical windows in studies in the VUV spectral region are presented. Spectral and photometric studies of...

  • Anisotropic hardness and fracture toughness of highly aligned YBa2Cu3O7-δ. Goyal, A.; Funkenbusch, P. D.; Kroeger, D. M.; Burns, S. J. // Journal of Applied Physics;3/1/1992, Vol. 71 Issue 5, p2363 

    Focuses on a study which reported the anisotropic hardness and fracture toughness of highly aligned YBa[sub2]Cu[sub3]O[sub7-δ]. Background to the study; Experimental procedure; Theoretical framework; Results and discussions.

  • IN-SITU CREEP MONITORING USING THE POTENTIAL DROP METHOD. Madhi, E.; Sposito, G.; Davies, C. M.; Cawley, P.; Nagy, P. B. // AIP Conference Proceedings;6/23/2011, Vol. 1335 Issue 1, p1631 

    A directional low-frequency Alternating Current Potential Drop (ACPD) sensor was developed for in-situ monitoring of creep in metals. The sensor relies on a modified ACPD technique that measures simultaneously both values of resistance in the axial and lateral directions using a square electrode...

  • Effect of Grain Boundary on the Character of Pulse-Train-Induced Cleavage Fracture in Copper Crystal. Zol�nikov, K. P.; Uvarov, T. Yu.; Skripnyak, V. A.; Lipnitskii, A. G.; Saraev, D. Yu.; Psakh�e, S. G. // Technical Physics Letters;Apr2000, Vol. 26 Issue 4, p323 

    The process of pulse-train-induced cleavage fracture in a copper crystal with grain boundary was studied by methods of computer simulation. It is demonstrated that trains of isolated compression pulses induced in the material favor the tendency to fracture propagation along the grain boundary.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics