Young's modulus and damping of partially sintered potassium sodium niobate (KNN) ceramics and its temperature dependence determined via the impulse excitation technique (IET)

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F24%3A43929043" target="_blank" >RIV/60461373:22310/24:43929043 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0955221924003030" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0955221924003030</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jeurceramsoc.2024.03.064" target="_blank" >10.1016/j.jeurceramsoc.2024.03.064</a>

Result language
angličtina
Original language name
Young's modulus and damping of partially sintered potassium sodium niobate (KNN) ceramics and its temperature dependence determined via the impulse excitation technique (IET)
Original language description
Potassium sodium niobate (KNN) is suitable for the preparation of lead-free piezoelectric ceramics, and thus the elastic properties and damping behavior should be reliably known for practical applications. In this work we compare partially sintered KNN ceramics prepared by uniaxial and conventional sintering from three different KNN powders and show that the impulse excitation technique (IET) is perfectly suited to determine Young's modulus at room temperature as well as the temperature dependence of Young's modulus and damping (heatingcooling cycles with maximum temperature 800 degrees C). Room temperature values of the effective Young's modulus of partially sintered KNN ceramics are below the predictions for convex pores and above a recently published numerical benchmark relation for concave pores. The phase transition temperatures determined by the IET are 160-190 degrees C for the low-temperature orthorhombic-tetragonal / tetragonal-orthorhombic transition and 388-412 degrees C for the high-temperature tetragonal-cubic / cubic-tetragonal transition, with hysteresis 12-25 K.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20504 - Ceramics

Project
<a href="/en/project/GA22-25562S" target="_blank" >GA22-25562S: Impulse excitation as an unconventional method for monitoring phase changes and microstructure evolution during thermal loading of materials</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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