2026-07-29T09:59:08Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/119552026-07-25T00:05:24Zcom_10259_9476com_10259.4_106com_10259_2604col_10259_9477

00925njm 22002777a 4500 dc Iacomini, Antonio . author Garroni, Sebastiano author Mureddu, Marzia author Malfatti, Luca author Thakkar, Swapneel author Orrù, Roberto author Barbarossa, Simone author Pakhomova, Ekaterina author Cao, Giacomo author Tamayo Ramos, Juan Antonio author Parra de la Parra, Sandra de la author Rumbo Lorenzo, Carlos author García, Álvaro author Bartolomé, José F. author Pardo, Lorena . author 2022-09 In this work, “lead free” 0.99K0.5Na0.5NbO3-0.01BiFeO3 (KNN–BF) piezoceramics were prepared by a combination of mechanochemical activation, Spark Plasma Sintering and post-annealing treatment. Results show that the annealing treatment causes important microstructural and electrical changes. The SPS sample was characterized by low electrical resistance, while the air annealed samples showed better insulating properties due to a partial compensation of the oxygen vacancy. The best piezoelectric properties were found for the samples annealed at 1000 and 1050 ​°C for 2h due to the optimum grain size and oxygen vacancy compensation achieved. A further enhancement of the dielectric and piezoelectric properties was achieved through a second annealing treatment in oxygen flux at 1050 ​°C for 30 ​min. Moreover, the toxicity of the pellets was evaluated through exposure experiments to the pulverized KNN–BF pellets, employing two widely used human and environmental cellular models. 0022-4596 https://hdl.handle.net/10259/11955 10.1016/j.jssc.2022.123589 Potassium sodium niobate High energy ball milling Spark plasma sintering Raman spectroscopy Dielectric Cytotoxic assessment Processing, microstructure, electrical properties and cytotoxic behaviour of lead-free 0.99K0.5Na0.5NbO3-0.01BiFeO3 piezoceramics prepared using Spark Plasma Sintering (SPS)