Physical, chemical and electrical study of 0.1Li₂O-0.4MO-0.5P₂O₅ oxide glasses M (Zn, Pb, Cu, Ba, Cd)

¹ Chemistry-Physics, Electrochemistry, and Environment Team, Faculty of Science and Technology, Moulay Ismail University, Er-Rachidia, Morocco ;
² Laboratory of Engineering Sciences and Professions, National School of Arts and Crafts, Moulay Ismail University, Meknes, Morocco ;
³ Laboratory of Materials Physiochemistry and Environment (LPCME), Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco.

^* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract

The study examines the physical and chemical properties of glassy and crystalline phosphate materials, emphasizing their structure characterized by ionic bonds linking chains of divalent metal cations to non-bridging oxygen atoms. It aims to determine the influence of specific divalent cations (Cu, Cd, Zn, Ba, Pb) on the attributes of glasses formulated with the composition 0.1Li₂O-0.4MO-0.5P₂O5. We studied the physical and chemical properties of certain glasses, focusing on density, molar volume, glass transition temperature, and chemical durability. We also assessed their electrical characteristics and utilized IR spectroscopy for structural analysis. Key findings revealed that the glass molar volume increases with the atomic number of the divalent cation in the sequence: V_m(Cu) < V_m(Zn) < V_m(Cd) < V_m(Ba) < V_m(Pb). Furthermore, the dissolution rate follows the order: D_R(Zn) < D_R(Cd) < D_R(Ba) < D_R(Cu) < D_R(Pb). The glass transition temperature (T_g) increases in the order T_g(Pb) < T_g(Cd) < T_g(Ba) < T_g(Zn) < T_g(Cu), indicating enhanced bond strength and compactness. Additionally, the divalent metal cation M²⁺ affects the direct current conductivity (σ_dc) and activation energy (E_a), with only the LiM₂(PO₃)₅ phase forming as observed in the X-ray diffractograms of the crystalline glass related to the composition.