Elaboration and structural characterization of new materials of KDP-Family

15^th Annual Congress on Materials Research & Technology

February 19-20, 2018 | Paris, France

Rawdha Dekhili, Thomas H Kauffmann, Hassen Aroui and Marc D Fontana

Universite de Lorraine, France
CentraleSupelec, France
Universite de Tunis El Manar, Tunisia
Universite de Tunis, Tunisia

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

Many studies are devoted to the family of compounds of formula MX2RO4 (M=K, Rb, NH4, Cs, Tl, X=H, D, R=P, As). Among these compounds, KDP is the most known material owing to many physical and chemical properties used for applications in non-linear optics, ferro-electricity piezoelectricity and electro-optics. Here our interest concerns new materials of this family: LiH2PO4 (LDP) and KLi(H2PO4)2 (KLDP). A few data were only reported on these materials. We more deeply investigate their structural, vibrational and optical properties. The KLDP and LDP compounds were synthetized by slow evaporation method and their crystal structure was determined at room temperature by X-ray diffraction. KLDP crystal belongs to the P21/c (C2h) space group of the monoclinic system whereas LDP crystal has the orthorhombic structure with the space group Pna21-C29v. The structures constitute on PO4 and LiO4 tetrahedra interconnected by oxygen atoms, to form a tridimensional network. Furthermore, the hydrogen bonds types consolidate the structure. The vibrational properties of LDP and KLDP crystals have been investigated at room temperature by means of Raman spectroscopy. The analysis of spectra revealed tetrahedrons PO4 and LiO4 vibration internal modes, stretching and bending OH modes. The results were confirmed by the DFT calculations. Raman measurements as a function of temperature and differential scanning calorimetry evidenced phase transition temperatures

Biography :

Rawdha Dekhili is currently pursuing his PhD in Chemistry at Universite de Lorraine, France and is affiliated to Centrale Supelec, France, Universite de Tunis El Manar, Tunisia and Universite de Tunis, Tunisia
Email:rawdhadekhilichimiste@gmail.com