New data about the electronic state of Tb³⁺ doping ions in the Tb-doped EuAl₃(BO₃)₄ and EuGa₃(BO₃)₄ borate single crystals have been obtained from the electron paramagnetic resonance (EPR) spectra measurements at X- and Q-band frequency range in the wide temperature interval. Prior to the EPR study, the X-ray diffraction (XRD) techniques the structural and elastic properties of Tb³⁺ doped EuAl₃(BO₃)₄ and EuGa₃(BO₃)₄ single crystals were determined at T = 300–1073 K. The following spin Hamiltonian parameters for Tb³⁺ ions were obtained: g_z = 17.064 ± 0.019, A_z = 6.231 ± 0.012 GHz, Δ = 7.333 ± 0.016 GHz in EuAl₃(BO₃)₄:Tb crystals and g_z = 17.664 ± 0.011, A_z = 6.251 ± 0.012 GHz, Δ = 3.891 ± 0.035 GHz in EuGa₃(BO₃)₄:Tb crystals. The temperature dependence of the EPR linewidth for Tb³⁺ ions in EuAl₃(BO₃)₄:Tb and EuGa₃(BO₃)₄:Tb crystals was described by an exponential law that is characteristic of the Aminov-Orbach processes. It was concluded that the Tb³⁺ ions substitute for the three-valence europium ones in EuGa₃(BO₃)₄:Tb/EuAl₃(BO₃)₄:Tb crystal lattice.

已从 X 处的电子顺磁共振 (EPR) 光谱测量中获得了关于 Tb 掺杂的 EuAl ₃ (BO ₃ ) ₄和 EuGa ₃ (BO ₃ ) ₄硼酸盐单晶中 Tb ³⁺掺杂离子的电子态的新数据- 以及宽温度区间内的 Q 波段频率范围。在 EPR 研究之前，X 射线衍射 (XRD) 技术分析了 Tb ³⁺掺杂的 EuAl ₃ (BO ₃ ) ₄和 EuGa ₃ (BO ₃ ) ₄的结构和弹性特性单晶在 T = 300–1073 K 下测定。获得了以下 Tb ³⁺离子的自旋哈密顿参数：g _z  = 17.064 ± 0.019，A _z  = 6.231 ± 0.012 GHz，Δ = 7.333 ± 0.016 GHz （EuAl ₃ BO ₃ ) ₄ :Tb 晶体和 g _z  = 17.664 ± 0.011, A _z  = 6.251 ± 0.012 GHz, Δ = 3.891 ± 0.035 GHz 在 EuGa ₃ (BO ₃ ) ₄ :Tb 晶体中。的EPR线宽为Tb的温度依赖性³⁺离子在EuAl ₃（BO ₃）₄ Tb和EuGa：₃（BO ₃) ₄ :Tb 晶体由指数定律描述，这是 Aminov-Orbach 过程的特征。得出的结论是，Tb ³⁺离子替代了EuGa ₃ (BO ₃ ) ₄ :Tb/EuAl ₃ (BO ₃ ) ₄ :Tb 晶格中的三价铕离子。