Vibrational characteristics of aluminum–phosphate compounds by an experimental and theoretical approach

Abstract

Aluminum phosphates are materials with relatively wide potential applications in many industries. The vibrational features of selected compounds were established on Raman and infrared spectroscopy. The experimentally determined spectra are compared to those calculated by ab initio methods. This gives a unique possibility of a proper assignment of the experimental spectral features to specific modes of vibration. In the results, it was evidenced that the spectra are characterized by two specific intense bands in the mid- and high-frequency range due to the P–O–P and P–O bonds in [PO4] tetrahedron vibrations. The position of the high-frequency band is related to the number of bridging oxygen atoms connecting [PO4] tetrahedrons in the unit cell. Additionally, the differences in the spectra were evidenced as a result of different polymorphic forms of the selected compounds. Therefore, the results may be useful in determining the phase composition of polyphase materials or structural features of aluminum–phosphate glasses and glass–ceramic materials.

Hydrogen‐Induced Formation of Surface Acid Sites on Pt/Al(PO3)3 Enables Remarkably Efficient Hydrogenolysis of C−O Bonds in Alcohols and Ethers

“…As a result, there are no significant changes in IR spectra after the 5th reuse experiment (Figure S3). Whereas, in XRD patterns, the diffraction peaks at 16°, 17°, and 26° appeared, which suggests that the structure of the Al(PO 3 ) 3 support partially changed to aluminum cyclohexaphosphate [15] via phase transition of Al(PO 3 ) 3 (Figure S4). Subsequantly, we compared the catalytic activity of Pt/Al(PO 3 ) 3 and Pt/aluminum cyclohexaphosphate for the hydrogenolysis of 1b .…”

Fenntarthatósági átmenet: kihívások és innovatív megoldások : Nemzetközi tudományos konferencia a Magyar Tudomány Ünnepe alkalmából

“…Outputs of different meetings include strengths, weaknesses, opportunities and threats to the country's society and economy. This resulted in compiling plans after feedback of previously-made eighty plans (GoJ, 2022). This vision has the application period of (2015-2025) which aims at having an integrated framework that governs the social and economic policies by providing opportunities for all.…”

Country Branding of the Hashemite Kingdom of Jordan

“…Outputs of different meetings include strengths, weaknesses, opportunities and threats to the country's society and economy. This resulted in compiling plans after feedback of previously-made eighty plans (GoJ, 2022). This vision has the application period of (2015-2025) which aims at having an integrated framework that governs the social and economic policies by providing opportunities for all.…”