Low-permittivity LiLn(PO 3 ) 4 (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

The development of dielectric materials with low permittivity and low loss is a great challenge in wireless communication. In this study, LiLn(PO3)4 (Ln = La, Sm, Eu) ceramic systems were successfully prepared using the traditional solid-state method. X-ray diffraction analysis indicated that the LiLn(PO3)4 ceramics crystallized in a monoclinic structure when sintered at 850–940 ℃. The characteristic peak shifted to high angles with variations in the Ln element, which was ascribed to a reduction in cell volume. Further analysis by structure refinement revealed that the reduction of cell volume resulted from the decline of chemical bond lengths and compression of [LiO4] and [PO4] tetrahedra. Remarkably, the…

• NN
  National Natural Science Foundation of China

  Awards: 52171141, 52272117
• NS
  National Synchrotron Radiation Laboratory
• NK
  National Key Research and Development Program of China

  Awards: 2022YFB3706604, 2022YFB3505104