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[15194] Artykuł:

Electric components of acoustic fields in piezoelectrics and some their topological features. Dynamic Problems in Anisotropic Solids

Czasopismo: Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika   Zeszyt: 81, Strony: 45-69
ISSN:  0239-4979
Opublikowano: 2004
 
  Autorzy / Redaktorzy / Twórcy
Imię i nazwisko Wydział Katedra Procent
udziału
Liczba
punktów
Vladimir I. Alshits33.00  
Vasilyi N. Lyubimov33.00  
Andrzej RadowiczWMiBMKatedra Mechaniki**33.00  

Grupa MNiSW:  Pozostałe publikacje (niepunktowane)
Punkty MNiSW: 0


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Słowa kluczowe:

krystalografia 


Keywords:

piezo-electric 



Abstract:

The existence conditions of zero electric fields E and zero electric displacements D are studied for bulk acoustic waves in piezoelectric crystals. General equations are derived for lines of zero electric fields, E(m) = O, and for specific points mo of vanishing electric displacements, D(mo) = O, on the unit sphere of propagation directions m2 = 1. It is proved that the both types of specific directions must exist in any (even triclinic) crystals.The obtained equations are solved for a series of examples of particular crystal symmetry. It is shown that the vectors D(m) being generally orthogonal to the wave normal m are characterized bydefinite orientational singularities in the vicinity of mo and can be described by the poincare indices n+O, +- 1 or +-2. The algebraic expressions for indices n are found both for unrestricted anisotropy and for a series of particular cases.