TY - JOUR ID - 70006 TI - Effect of nano and micron WO3 on microstructure and electrical properties of lead free potassium sodium niobate piezoceramics JO - Advanced Ceramics Progress JA - ACP LA - en SN - 2423-7477 AU - Hayati, Raziye AU - Feizpour, Mahdi AU - Ebadzadeh, Touraj AD - Ceramic Department, Material and Energy Research Center (MERC) AD - Ceramic , Merc Y1 - 2015 PY - 2015 VL - 1 IS - 3 SP - 11 EP - 15 KW - Lead free piezoceramics KW - Potassium sodium niobate KW - Nano and micron WO3 KW - Microstructure KW - Sintering process KW - Electrical Properties DO - 10.30501/acp.2015.70006 N2 - Lead free potassium sodium niobate (KNN) piezoceramics were synthesized via conventional solid state sintering route. Nano and micron WO3 were separately added to KNN through ball-milling. Dielectric and piezoelectric properties of samples sintered in the temperature range of 1110°-1145°C were measured by precision LCR-meter and APC d33-meter devices. The results revealed that micron WO3 particles were effective in inhibiting the grain growth in KNN ceramics. Micron WO3-added KNN obtained much finer microstructure and the sintering process terminated at higher temperature compared to pure KNN and nano WO3-added KNN. Densification and electrical properties of KNN were considerably affected by using nano and micron WO3. Nano WO3-added KNN obtained its maximum density at lower sintering temperature compared to micron WO3-added KNN. With increasing the sintering temperature over optimum amounts, the density of both WO3-added KNN samples decreased due to the evaporation of alkalis. Finally, at 1125ºC KNNW3n showed d33, εr, tanδ, and Qm of 75 pC/N, 345, 2%, and 50, respectively. For KNNW3m sample at 1135ºC these values were 81 pC/N, 773, 3.3%, and 30, respectively. UR - https://www.acerp.ir/article_70006.html L1 - https://www.acerp.ir/article_70006_774d5363a513435c4b3c4ca9b016dec6.pdf ER -