The oxides family of the PbO-Bi₂O₃-Ga₂O₃ (BGO) system is widely used in electronics, optoelectronics, fiber-optic amplifiers and lasers in the mid-IR, as scintillators, etc [1, 2]. Theirs low technological requirements and consequently low costs, make them subjects of intensive studies. Some new aspects in producing and characterizing BGO glasses will be presented. A 30 % Bi₂O₃ and 70 % GeO₂ mixtures were prepared by wet-mixage in acetone. The mixtures, were dried at 100 ^oC, were melted at 1050 ^oC and than poured on a preheated graphite plate at different temperatures, below and over the glass transition temperature. Samples of ~1 mm thick and ~0.5 cm² surface were structurally and optically analyzed at room temperature and compared to [3]. The permittivity and losses were also investigated on 45Hz-5MHz frequency range and continuously from -100 ^oC to +200 ^oC temperature interval, using a Quatro Cryosystem and HIOKI 035-22 RLC bridge. The relative permittivity continuously increases at a rate of 3.5 10^-3/ ^oC on this temperature range. Important changes could be noticed with frequencies and temperatures in subsequent measurements till 400 ^oC, were the samples properties are affected by crystallization processes. At temperatures higher than 250 ^oC, the higher mobility of building units in the lattice increases the permittivity values. The cluster mobility may be responsible for the permittivity increase in the range temperature, 275-300 ^oC at low frequencies. At high temperatures (≥ 300 ^oC) individual atomic/ionic components appear to have much higher mobility. The losses behavior shows the contribution of different activated mechanism with temperatures and frequency.

References: [1] S. Polosan, E. Apostol, M. Secu, G. Aldica, Phys. Stat. Sol. (c) 2 (1) 93 (2005). [2]  Sharaf El-Deen et al, Coplex. Internat., vol.09, (2002), p1-17. [3] Y.G. Choi and J. Heo, J. Non-Cryst. Solids 217, 199 (1997).

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/16023 must be provided.

1. Temperature and frequency investigations of the electrical parameters in the TGS ferroelectric transition
2. Ceramic BaZn_1/3Ta_2/3O₃ for microwave applications
3. Ceramic materials Ba _(1-x) Sr_xTiO₃ for electronics – synthesis and characterization
4. SBF studies of Bioglass Nanostructured Thin Films obtained by pulsed laser deposition or magnetron sputtering: a comparative study