[IEEE 2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) - Genova, Italy (2019.6.11-2019.6.14)] 2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) - Study of Crystalline Phases in the 3Bi 2 O 3 :2TeO 2 and Bi 6-x Tb x Te 2 O 13 Systems for Fuel Cell