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Microwave dielectric ceramics with dielectric constant ( ε r ≈ 20) for 5G/6G communications, focusing on four material systems—MgTiO 3 –CaTiO 3 , (Ca,La)(Al,Ti)O 4 , LnNbO 4 , and Li 2 TiO 3 .
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He et al. (2025) studied this question.
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