## 3 Results
Thus, near \(x\sim\)0.45, there is a configuration transition between two types of isomorphic SS (SS1 \(\rightarrow\) SS2). Figure 4 shows the \(\varepsilon/\varepsilon_{0}(T)\) dependences of ceramics with \(x=0.2\div 0.7\) (\(\Delta x=0.1\)) in the temperature-frequency range under consideration, obtained in the cooling mode. It can be seen  
that the \(\varepsilon/\varepsilon_{0}(T)\) dependences are in accordance with the phase diagram of the system: increase of Sr content leads to an increase in the relaxation properties, accompanied by a large blurring and a shift towards room temperatures in the region of the ferroelectric-paraelectric phase transition, which correlates with Reference [11]. Barium strontium niobate ceramics have a homogeneous, dense, practically non-porous microstructure (Figure 5) from crystallites of size (\(5\div 10\)) \(\upmu\)m, which indicates a sufficiently high quality of the studied object. As can be seen from Figure 6, the \(\varepsilon/\varepsilon_{0}(T)\) dependences of the BSN-50 ceramics considered as an example at T\({}_{m}\) \(<\) T \(<\) T\({}_{d}\) (T\({}_{d}\) is the Burns temperature below which the polar nano-regions appear) is well approximated by the formula \(1/\varepsilon-1/\varepsilon_{m}=(T-T_{m})^{\gamma}/C_{1}\) (\(\gamma\) is the smearing parameter of the PT, \(\varepsilon_{m}\) and T\({}_{m}\) are, respectively, the height and temperature of the maximum \(\varepsilon/\varepsilon_{0}(T)\)), and T\({}_{m}(f)\) is the Fogel-Fulcher ratio \(f=f_{0}\)\(\exp\{\mathrm{E}_{a}/[k\cdot(T_{m}-T_{f})]\}\) (\(f_{0}\) is the frequency of attempts to overcome the potential barrier E\({}_{a}\), k is the Boltzmann constant, and T\({}_{f}\) is the Vogel-Fulcher temperature). The established high value of \(\gamma\sim\)1.99, the fulfillment of the Curie-Weiss law only at T \(\geq\) T\({}_{d}\) and the tendency to zero residual polarization only at T \(-\)T\({}_{d}\) testify to the high degree of blurring of the FE-PF PT, and the anomalies on the \(\varepsilon/\varepsilon_{0}(T)\), and tg\(\delta\) (T) in the vicinity of T\({}_{f}\) = 355 K, most likely, about the transition of BSN-50 from the relaxor to the macrodomain state. The blurring of the FE \(\rightarrow\) PE phase transition in the object is most likely due to fluctuations in the chemical composition over the volume of the material due to the disordered arrangement of the Ba and Sr atoms in the structure. Figure 4: Dependencies \(\varepsilon/\varepsilon_{0}(T)\) of ceramic of SS \(x\) = 0.2 \(\div\) 0.7 (\(\Delta x\) = 0.1) in temperatures range T = 200 \(\div\) 700 K and frequencies \(f\) = 200 \(\div\) 10\({}^{6}\) Hz, obtained in the cooling mode. The arrow shows the direction of growth of \(f\). The numbers on curves corresponds to the values of \(x\). Figure 5: Image fragments of the surface for the mechanical chip of the barium strontium niobate (BSN)-50. Figure 7 [8] shows the absorption spectra of \(L\), the electromagnetic radiation energy of the SS BSN system obtained using two different techniques. Figure 7: Dependences of microwave absorption on \(f\) in SS (1 - x)BaNb\({}_{2}\)O\({}_{6}\)-xSrNb\({}_{2}\)O\({}_{6}\). (MSL (a–d), waveguide line in the E-plane (**e**–**h**) and H-plane (**i**–**l**)). In the first method, the micro strip line (MSL) was used as a transmission line (Figure 7a-d), in the second method, a rectangular waveguide (Figure 7e-l). In both cases, the sample was placed in the region of the transmission line near the maximum concentration of the electric electromagnetic field. In this case, the sample was placed in two directions in the waveguide line: in the E-plane (Figure 7e-h) and H-plane (Figure 7i-l). Analysis of the figures showed that studies using MSL are more promising, because of its greater sensitivity to the crystal-chemical state of the sample. This is due to a greater connection with the MSL both in the E- and H-field.