Characterization of α ↔ β PbF2 phase transition by several techniques

• Published in: Journal of materials science Vol. 35; no. 13; pp. 3263 - 3268
• Main Authors: PORTELLA, K. F, RATTMANN, K. R, DE SOUZA, G. P, GARCIA, C. M, CANTAO, M. P, MUCCILLO, R
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.07.2000; Springer Nature B.V
• Subjects: Beta phase; Condensed matter: structure, mechanical and thermal properties; Crystalline state (including molecular motions in solids); Crystallographic aspects of phase transformations; pressure effects; Dynamic mechanical analysis; Exact sciences and technology; Ion currents; Materials science; Pellets; Phase transitions; Photomicrographs; Physics; Scanning electron microscopy; Structure of solids and liquids; crystallography; X-ray diffraction; Compression; Beta phase; Inorganic compounds; Phase transformations; XRD; Experimental study; Lead fluorides; Alpha phase; Dynamic mechanical properties; Solid electrolytes; SEM; Impedance; Polymorphism
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1004819222026

X-ray Diffraction (XRD), Dynamic-Mechanical Analysis (DMA), Impedance Spectroscopy (IS), and Scanning Electron Microscopy (SEM) have been used to the study of α → β phase transition in PbF2 pellets pressed uniaxially in the 37 MPa–480 MPa range. A mixture of β and α phases is detected and the α-phase content at room temperature is found to be dependent on the applied load. The dilation results on DMA, the phase identification by XRD, the ionic conductivity results by IS analysis and the SEM micrographs of β-PbF2 pellets show evidences for the increase in α-phase content at the expense of the β-phase. SEM analysis provided further evidence for specimen sintering under heating at approximately 498 K.