The diagrammatic methods for the Racah and standard basis operators are applied to the case of two-sublattice systems with biquadratic interactions and spin S = 3/2. The elementary excitations are calculated in the (l/z)O approximation ( z is the number of spins interacting with any given spin) in three phases: antiquadrupolar, ferrimagnetic, and ferromagnetic. I n the antiquadrupolar phase there are two doubly degenerate branches of magnons. The spectrum of quadrons coincides with that of magnons. Three branches of magnons and two branches of quadrons are obtained in the ferrimagnetic phase. I n the ferromagnetic phase there is one branch of magnons and one of quadrons.Die Diagrammethode fur Racah-Operatoren und Operatoren der Standardbasis werden auf den Fall von Systemen mit zivei Untergittern und Spin S = 3/2 angewendet. Die Elementaranregungen werden in der (l/z)O-Naherung ( z ist die Zahl der Spins, die mit irgendeinem gegebenen Spin wechselwirken) in drei Phasen berechnet : antiquadrupolar, ferrimagnetisch und ferromagnetisch. I n der Antiquadrupolphase existieren zwei doppelt entartete Magnonenzweige. Das Spektrum der Quadronen stimmt mit dem der Magnonen iiberein. Drei Zweige von Magnonen und zwei Zweige von Quadronen werden in der ferrimagnetischen Phase erhalten. In der ferromagnetisahcn Phase existiert ein Zweig von Magnonen und einer fiir Quadronen.
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