Low-temperature solution processing route for potassium sodium niobate (KNN) thin films

Pinho, Rui; Bretos, Íñigo; Jiménez, Ricardo; Calzada, M. L.; Hortigüela, María J.; Otero‐Irurueta, Gonzalo; Ivanov, Maxim; Tkach, Alexander; Costa, Maria Elisabete V.; Vilarinho, Paula M.

doi:10.1016/j.jeurceramsoc.2023.03.036

Cited by 1 publication

(1 citation statement)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To verify whether the observed phenomenon is specific to certain process conditions, we also conducted XRD analysis on the three KNN thin-film structures annealed at the temperature of 650, 700, 750, and 800 °C. Temperature is one of the most crucial influencing factors in thin film fabrication process, as it strongly affects the microstructure and performance characteristics of the films. ,, Therefore, in this study, the impact of the annealing temperature on the films is illustrated by using it as a representative variable. XRD analysis, as depicted in Figure , clearly demonstrates that at various temperatures, the KNN film with alternating e-KNN and o-KNN layers exhibits a superior crystalline structure and higher (100) preferred orientation compared to the o-KNN and e-KNN films.…”

Section: Results and Discussionmentioning

confidence: 99%

Alternating Spin-Coating Sol–Gel Synthetic Route for Highly (100)-Textured Potassium Sodium Niobate Films

Zhang,

Yao,

Wang

et al. 2024

Crystal Growth & Design

View full text Add to dashboard Cite

This study introduces a novel sol−gel synthesis route that combines the metal alkoxide and nonalkoxide methods to synthesize highly preferentially oriented potassium sodium niobate (KNN) films. In this approach, C 10 H 25 NbO 5 and Nb 2 O 5 are used as niobium sources to synthesize KNN sols, which are then alternately spin-coated to form the desired KNN film (referred to as e-KNN/o-KNN). Pure C 10 H 25 NbO 5 source KNN film (e-KNN) and pure Nb 2 O 5 source KNN film (o-KNN) are also synthesized as control samples. As expected, alternating spincoating facilitates the enhancement of (h00)-preferred orientation and crystallinity, and both were superior to the KNN film with alternating e-KNN and o-KNN layers compared with the two pure KNN films. Interestingly, variations in annealing temperature do not affect the crystalline characteristics of these three types of KNN films, indicating that the synthesis route plays a predominant role in determining the microstructural characteristics. Furthermore, the dielectric response and optical properties of KNN films can also be precisely tailored through the synthesis route. For instance, using Nb 2 O 5 as a niobium source can significantly enhance the dielectric constant of KNN films, whereas substituting C 10 H 25 NbO 5 for Nb 2 O 5 can effectively accelerate the dielectric polarization speed of KNN films, thereby reducing their high-frequency dielectric losses. This research provides new insights and significant guidance for tailoring the sol−gel synthesis, microstructural characteristics, and performance of KNN films.

show abstract

Section: Results and Discussionmentioning

confidence: 99%