Nanocrystalline triple perovskite compounds A3Fe2BO9 (A = Sr, Ba; B = W, Te) with ferromagnetic and dielectric properties for triboelectric energy harvesting

Kojčinović, Jelena (author), Sahu, Manisha (author), Hajra, Sugato (author), Tatar, Dalibor (author), Klaser, Teodoro (author), Skoko, Željko (author), Jagličić, Zvonko (author), Sadrollahi, Elaheh (author), Litterst, Fred Jochen (author), Kim, Hoe Joon (author), Djerdj, Igor (author)

Four iron-based triple tungstate and tellurate perovskites have been synthesized in the nanocrystalline form using a simple sol–gel citrate route: Sr3Fe2WO9 (SFWO), Ba3Fe2WO9 (BFWO), Sr3Fe2TeO9 (SFTO), and Ba3Fe2TeO9 (BFTO). Strontium-based compounds crystallize in the tetragonal space group I4/m, while barium-based compounds crystallize in the hexagonal space group P63/mmc. All compounds possess a ferromagnetic order with high values for room-temperature magnetization. The magnetic state as traced by Mo¨ssbauer spectroscopy is heterogeneously related to disorder. The compounds also possess relatively high dielectric constants (20–199.16) measured at 1 MHz and a moderate loss factor. The synthesized triple perovskite compounds were utilized in the fabrication of vertical contact mode triboelectric nanogenerators (TENGs). The working mechanism and the electrical response of the TENGs were extensively studied. The TENG device based on BFTO/Kapton triboelectric layers produces the highest output of 88 V/2.69 mA. For the first time, the surface polarity of the triple perovskite was shown using a Kelvin probe force microscopy technique (KPFM), which elucidates the positive polarity of the triboelectric layer. Furthermore, the TENG device was used to charge several capacitors and to carry out the powering of electronics that make it an excellent choice for various self-powered applications.

• Language: English
• Keywords: perovskites, ferromagnetism, dielectric constant
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics; FGG - Faculty of Civil and Geodetic Engineering
• Year: 2022
• Number of pages: Str. 1116-1128
• Numbering: Vol. 6, iss. 9
• PID: 20.500.12556/RUL-146428
• UDC: 538.9
• ISSN on article: 2052-1537
• DOI: 10.1039/D1QM01565F
• COBISS.SI-ID: 138237699
• Publication date in RUL: 31.05.2023

Record is a part of a journal

• Title: Materials chemistry frontiers
• Shortened title: Mater. chem. front.
• Publisher: Royal Society of Chemistry
• ISSN: 2052-1537
• COBISS.SI-ID: 20199427

Secondary language

• Language: Slovenian
• Keywords: perovskiti, feromagnetezem, dielektrična konstanta