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Lattice Dynamic Kit

LDK


Lattice dynamics is an essential component of any graduate course in physicals and material science. In particular it is essential for understanding the interaction of electromagnetic waves and crystalline solids. In general, students find it difficult to understand concepts like acoustic mode, optical mode, energy gap etc, which they cannot see for themselves in the laboratory. Here a laboratory exercise is described in which the student follows a carefully prescribed procedure which presents him with simplified model of the system and allows him to verify well established theories. The exercise is valid for the study of dynamics of mono and diatomic lattices.
Hardware Features
  • Low Distortion : Audio oscillator upto 90KHz with variable amplitude.
  • Frequency meter : 16 x 2 LCD is provided to display Frequency and status of lattice selected.(Mono Automic / Dia Automic)
The following experiments may be performed with the help of a kit involving an audio oscillator and a general purpose cathode ray oscilloscope :
  • Study of the dispersion relation for the mono-atomic lattice.
  • Determination of the cut-off frequency of the mono-atomic lattice.
  • Study of the dispersion relation for di-atomic lattice over the ‘acoustical mode’ and the optical mode’ and observing the energy gap.



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