Lithium ion conductivity, crystallization tendency, and microstructural evolution of LiZrxTi2-x(PO4)3 NASICON glass-ceramics (x = 0 - 0.4) en en In this research, NASICON type (LiZrxTi2-x(PO4)3) glass-ceramics were fabricated (x = 0.1, 0.2, 0.3, and 0.4). Lithium-ion conductivity along with the crystallization tendency and microstructural features were examined in this regard. Parent glasses obtained through melt quenching were converted to the glass-ceramic specimens after one-step heat treatment procedure. The resultant glass-ceramics were deeply explored by means of different techniques including scanning electron microscope, differential thermal analysis, X-ray diffractometry, and ionic conductivity measurements. According to the obtained results, presence of Zr4+ ions in the glass network and its gradual increase caused the enhanced crystallization temperature as well as declined crystallinity and microstructure coarsening. In all studied glass-ceramics, LiT2(PO4)3 solid solution was the dominant crystalline phase and Zr4+ ions partly substituted in the structure of this crystalline phase. Moreover, presence of Zr4+ ions in the glass composition resulted in diminished lithium-ion conductivity of corresponded glass-ceramics at ambient temperature. Consequently, total conductivity of specimen with the highest level of ZrO2 (x = 0.4) was measured to be 0.78 × 10-5 Scm-1, being considerably less than ionic conductivity of the base (x = 0) glass-ceramic (3.04 × 10-5 Scm-1). It seems that less crystallinity of ZrO2 containing glass-ceramics decreases required connectivity between the lithium-ion free paths and is responsible for the diminished ionic conductivity of these specimens. 67 72 Parisa Goharian Ceramic Department, Materials and Energy Research Center (MERC), Alborz Iran Alireza Aghaei Ceramic Department, Materials and Energy Research Center (MERC), Alborz Iran Bijan Eftekhari Yekta School of Metallurgy and Materials Engineering Iran University of Science and Technology, Tehran Iran Sara Banijamali Ceramic Department, Materials and Energy Research Center (MERC), Alborz Iran banijamali@merc.ac.ir, banijamalis@yahoo.com Glass-ceramic Crystallization Ionic conductivity Zirconium ions NASICON Vol 3 No 2 Paper 1.pdf [1] Y. Yang, R. Wang, Z. Shen, Q. Yu, R. Xiong, W. Shen, Towards a safer lithium ion batteries: A critical review on cause, characteristics, warning and disposal strategy for thermal runaway, Adv. Appl. 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