Fabrication of Al2O3 -Nb2O5 -LiF-ZrO2 FGMs by SPS method: microstructural evaluation, dynamic and sintering behaviour - Jesus, Paulo Roberto Rodrigues de; Silveira, Pedro Henrique Poubel Mendonça da; Ribeiro, Matheus Pereira; Silva, Thauane Teixeira da; Arantes, Vera Lúcia; Gomes, Alaelson Vieira (Processing and Application of Ceramics, 2022)