Investigation of the structural, microstructural, and dielectric properties of Ho-doped PbTiO3 for piezoelectric applications. - Belhajji, Mounir; Moutaouaffiq, Adil; Nfissi, Aziz; Sayouri, Salaheddine; Lamcharfi, Taj-dine (Journal of Materials Science: Materials in Electronics, 2022)