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[16714] Artykuł:

Non-piezoactivity in piezoacoustics: basic properties and topological features

Czasopismo: Archive of Applied Mechanics   Tom: 74, Zeszyt: 11-12, Strony: 739-745
ISSN:  0939-1533
Wydawca:  SPRINGER, 233 SPRING STREET, NEW YORK, NY 10013 USA
Opublikowano: Listopad 2005
 
  Autorzy / Redaktorzy / Twórcy
Imię i nazwisko Wydział Katedra Procent
udziału
Liczba
punktów
Vladimir I. Alshits33.00  
Vasilyi N. Lyubimov33.00  
Andrzej RadowiczWMiBMKatedra Mechaniki**3315.00  

Grupa MNiSW:  Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A)
Punkty MNiSW: 15
Klasyfikacja Web of Science: Article; Proceedings Paper


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Keywords:

piezoelectricity  anisotropy  acoustic waves 



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)=0, and for specific points m(0) of vanishing electric displacements, D(m(0))=0, on the unit sphere of propagation directions m(2)=1. The obtained equations are solved for a series of examples of particular crystal symmetry. It is shown that the vectors D-alpha(m) being generally orthogonal to the wave normal m are characterized by definite orientational singularities in the vicinity of m(0) and can be described by the Poincare indices n=0, +/- 1 or +/- 2. The algebraic expressions for the indices n are found both for unrestricted anisotropy and for a series of particular cases.