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Nanometric AgFeO 2  and AgCrO 2  delafossite were easily prepared by the flash auto-combustion method. The two main bands estimated from FTIR (Fourier-transform infrared) analysis were the tetrahedral A-site (573 cm −1  for AgFeO 2 , 630 cm −1  for AgCrO 2 ) and the octahedral B-site (484 cm −1  for AgFeO 2 , 595 cm −1  for AgCrO 2 ). This study is mainly focused on the elastic properties evaluated from the FTIR analysis and showed that AgCrO 2  delafossite is more elastic than AgFeO 2  delafossite. The elastic properties can be explained by studying the longitudinal and transverse velocities. Owing to the optical properties results, AgCrO 2  delafossite is a promising material to be applied in optical devices. However, AgFeO 2  delafossite is a promising material in magnetic applications because it showed a large switching field distribution by 9-fold more than that of AgCrO 2  delafossite. Moreover, high-frequency applications were calculated from the magnetic analysis and showed that both samples could be applied in ultra-high microwave applications.

Influence of Elastic and Optical Properties on AgFeO2 and AgCrO2 Delafossite to be Applied in High-Frequency Applications