High transmittance in lead-free lanthanum modified potassium-sodium niobate ceramics

Dong Yang, Zhenyu Yang, Xiaoshuai Zhang, Lingling Wei, Xiaolian Chao, Zupei Yang

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Compared to lead lanthanum zirconate titanate (PLZT), potassium-sodium niobate shows good advances because of its excellent photoelectric response frequency and holographic storage. However, its low transmittance limits its application in photoelectrical controllers. To address this issue, lanthanum was introduced as a dopant, and the properties of the resulting ceramics were evaluated using both experimental and theoretical approaches. The (1-x)(K0.5Na0.5)NbO3-xLa2O3 (KNN-xL; x = 0.005, 0.010, 0.015, 0.020) transmittance ceramics were prepared by traditional low-pressure sintering process. Among the ceramics examined, KNN-0.015L achieved the widest band gap (Eg) of 3.108 eV and the highest transparency of 74%; both values are higher than those of PLZT (band gap = 3.10 eV, transparency = 70%) prepared by hot-press sintering. The transition rule was evaluated by density functional theory (DFT) to validate the experimental results obtained. Additionally, the related mechanism of transparency variation induced by electronic structure and grain size modulation was discussed thoroughly.

Original languageEnglish (US)
Pages (from-to)21-29
Number of pages9
JournalJournal of Alloys and Compounds
Volume716
DOIs
StatePublished - 2017

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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