Intrinsic Enhancement of Permittivity with Ultralow Dielectric Loss in Donor-Acceptor Co-Doped Rutile TiO₂ Ceramics

Abstract

The immense potential of colossal dielectric materials for use in high-energy-density storage applications has driven much recent development and research. The discovering of such dielectric materials with the required high permittivity and low dielectric loss is still a highly challenging. Herein, the donor-acceptor co-doped TiO₂ has been developed based on (Mg_0.5W_0.5)_xTi_1-xO₂, (In_0.5W_0.5)_xTi_1-xO₂ and (Ni_0.5Nb_0.5)_xTi_1-xO₂; where x = 0.005–0.01, that manifests high permittivity (>10⁴). The resulted permittivity attains the quadruple than that of pure TiO₂ ceramic with low dielectric loss of ∼0.02 over a broad temperature range. This performance is corresponded to the electron-pinned defect-dipoles, providing the extra dielectric response to those of rutile TiO₂ host ceramics. This research offers the way to develop functional colossal-dielectric materials by engineering complex defects into the bulk that will help for further discovery of promising new dielectric materials in future.

KEYWORDS:

• Colossal permittivity
• rutile TiO₂
• dielectric ceramics

Additional information

Funding

This work was supported financially by King Mongkut’s Institute of Technology Ladkrabang (KMITL) under Grant No. 2564-02-05-026. The work of Satana Pongampai was supported financially under Grant No. KREF146411. The work of Thitirat Charoonsuk was supported financially by Srinakharinwirot University under the Grant number 669/2563. The work of Wanwilai Vittayakorn was funded by National Research Council of Thailand (NRCT).