Relative material parameters αE, αH, ϑG, ϑF, ξE, ξF, βH, βG, ζE, ζG, λH, and λF for magnetoelectroelastics to model acoustic wave propagation incorporating gravitational phenomena

Regarding solid materials of symmetry class 6 mm, it is natural to deal with mechanical, electrical, magnetic, gravitational, and cogravitational properties. In addition to the electromagnetic α and gravitocogravitic ϑ constants, the incorporation of gravitational phenomena for these smart magnetoelectroelastics adds the gravitoelectric ζ, cogravitoelectric ξ, gravitomagnetic β, and cogravitomagnetic λ constants. All of them contribute to the value of the coefficient of the electromagnetogravitocogravitomechanical coupling (CEMGCMC). The CEMGCMC represents one of very important material characteristics because the dynamic characteristics such as the bulk and surface acoustic wave speeds depend on it. Therefore, it requires experimental determinations of the α, ϑ, ζ, ξ, β, and λ. In addition to the well-known relative parameters α_E and α_H, this report introduces the relative material parameters ϑ_G, ϑ_F, ξ_E, ξ_F, β_H, β_G, ζ_E, ζ_G, λ_H, and λ_F, where the subscripts “E”, “H”, “G”, “F” relate to the electrical, magnetic, gravitational, and cogravitational subsystems, respectively. It is expected that their measurements can be preferable due to the successful measurements of α_E and α_M during the last six decades. The knowledge of the complete set of the material parameters for different magnetoelectroelastics can provide a class of commercially fitting materials to constitute various technical devices with suitable characteristics. This can actually contribute to the development of infrastructure for signal processing based on the new fast waves that can propagate in the solids at the speeds Λ₁ = (ζλ)^–1/2 → ~ 10¹³C_L and Λ₂ = (ξβ)^–1/2 → ~ 10¹³C_L, where C_L is the light speed in a vacuum. Also, the new fast waves can propagate in a vacuum at the speeds Λ₀₁ = (ζ₀λ₀)^–1/2 → ~ 10¹³C_L and Λ₀₂ = (ξ₀β₀)^–1/2 → ~ 10¹³C_L. These speeds Λ₀₁ and Λ₀₂ are already apt for development of the instant interplanetary communication.