Colossal dielectric constant in K 2 Ti 2 O 5

Autor: Rani, Rashmi, De Sousa Coutinho, Sofia, Holé, Stephane, Leridon, Brigitte
Přispěvatelé: Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Materials Letters
Materials Letters, Elsevier, 2020, 258, ⟨10.1016/j.matlet.2019.126784⟩
ISSN: 0167-577X
DOI: 10.1016/j.matlet.2019.126784⟩
Popis: International audience; Potassium dititanate (K 2 Ti 2 O 5) ceramics are shown to exhibit solid electrolyte properties with a colossal dielectric constant (up to 10 7) together with a high ionic conductivity (up to 10 À5 S cm À1) at room temperature. Compared to Rb 2 Ti 2 O 5 crystals and ceramics, this is 2 orders of magnitude below but uses more abundant and eco-friendly compounds. For both materials, the dielectric constant and the ionic conductivity as a function of temperature and frequency seem to be linked together. The 2-order-of-magnitude difference can be attributed to a c-axis variation in the structure. K 2 Ti 2 O 5 material can be interesting for electronic applications as a supercapacitor compound.
Databáze: OpenAIRE
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