In this work the crystal structure by single crystal X‐ray measurement and optical properties of 1D propane‐1,2‐diammonium pentachlorobismuthate [NH3CH2CH(NH3)CH3]BiCl5 organic–inorganic hybrid perovskite are presented. It is prepared by mixing ethanolic solution of equimolar ratios (1:1) of its basic components. The title compound crystallized in the noncentrosymmetric orthorhombic space group Pca21 with Z = 8 molecules per unit cell. The unit‐cell parameters are a = 19.8403 (7) Å, b = 6.3303 (2) Å, c = 19.0314 (7) Å. The vibrational spectra are studied by Raman and infrared spectroscopy. The optical properties show a strong absorption in the ultraviolet region, the band gap energy Eg is found to be 3.15 eV. Cathodoluminescence measurements are also discussed.

In this work, the effects of silver nanoferrite and nanochromite (Ag2Fe2O2, Ag2Cr2O4) were studied using the flash auto-combustion technique. Numerous physical properties were clarified from the different structures determined from the x-ray examination such as lattice parameter the cation dispersion, oxygen parameter, hopping length, and interatomic distance. Among antimicrobial properties, Ag addition to both samples showed high efficacy against both types of tested bacteria (gram-positive and gram-negative); however, they showed moderate effect against Candida albicans fungus. No activity appeared against Aspergillus flavus fungus for both samples. The switching field and high-frequency response of Ag2Fe2O4 and Ag2Cr2O4 nanoparticles were studied from the magnetic properties. Ag2Cr2O4 nanoparticles are expected to be used for high-frequency applications more than Ag2Fe2O4 ones. As a result of all previous analyses, the applications of this study promote the use of Ag2Fe2O4 nanoferrite and Ag2Cr2O4 nanochromite for high-frequency, switching field, and biomedical applications as antimicrobial nanomaterials.

Nanometric AgFeO2 and AgCrO2 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 AgFeO2, 630 cm−1 for AgCrO2) and the octahedral B-site (484 cm−1 for AgFeO2, 595 cm−1 for AgCrO2). This study is mainly focused on the elastic properties evaluated from the FTIR analysis and showed that AgCrO2 delafossite is more elastic than AgFeO2 delafossite. The elastic properties can be explained by studying the longitudinal and transverse velocities. Owing to the optical properties results, AgCrO2 delafossite is a promising material to be applied in optical devices. However, AgFeO2 delafossite is a promising material in magnetic applications because it showed a large switching field distribution by 9-fold more than that of AgCrO2 delafossite. Moreover, high-frequency applications were calculated from the magnetic analysis and showed that both samples could be applied in ultra-high microwave applications.

The nanomaterials silver nanoparticles accompanied magnetite impurity (Ag–Fe3O4) (AF) and cobalt nano ferrite/silver–magnetite (0.3 CoFe2O4/0.7Ag–Fe3O4) (CAF) nanocomposite were prepared by flash auto-combustion using urea as fuel. This is the first time preparing this new nanocomposite material. The as-prepared nanomaterials were characterized by X-ray diffraction pattern, atomic force microscopy, and Fourier transform infrared spectroscopy. This characterization affirmed that the nanoparticles were prepared in the nanoscale range with a cubic structure. The saturation magnetization of the CAF nanocomposite is 29-fold that of AF nanoparticles, and the coercivity of CAF is 19-fold that of AF. Moreover, a transformation from a soft hysteresis loop (AF) to a hard hysteresis loop for the CAF nanoscale makes CAF nanocomposite suitable for many technological applications, especially in a permanent magnet. Also, magnetic measurements showed that the operating frequency value of AF nanoparticles is very high in the radio wave region, and that of the CAF nanocomposite is an ultra-high frequency in the microwave S-band region. Unexpected behavior appeared for the antimicrobial activity of CAF nanocomposite. It was found that AF nanoparticles gave strong antimicrobial efficacy than CAF nanocomposite against the tested gram-positive and gram-negative bacteria. Thus, the AF and CAF nanomaterials are promising for many technological applications, especially biomedical ones for AF nanoparticles and a permanent magnet for CAF nanocomposite.

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