Lead-Free Piezoceramics: Revealing the Role of the Rhombohedral鈥揟etragonal Phase Coexistence in Enhancement of the Piezoelectric Properties

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• 作者：Fernando Rubio-Marcos ; Rigoberto L贸pez-Ju谩rez ; Rocio E. Rojas-Hernandez ; Adolfo del Campo ; Neftal铆 Razo-P茅rez ; Jose F. Fernandez
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 21, 2015
• 年：2015
• 卷：7
• 期：41
• 页码：23080-23088
• 全文大小：481K
• ISSN：1944-8252

文摘

Until now, lead zirconate titanate (PZT) based ceramics are the most widely used in piezoelectric devices. However, the use of lead is being avoided due to its toxicity and environmental risks. Indeed, the attention in piezoelectric devices has been moved to lead-free ceramics, especially on (K,Na)NbO₃-based materials, due to growing environmental concerns. Here we report a systematic evaluation of the effects of the compositional modifications induced by replacement of the B-sites with Sbp>5+p> ions in 0.96[(K_0.48Na_0.52)_0.95Li_0.05Nb_1鈥?i>xSb_xO₃]-0.04[BaZrO₃] lead-free piezoceramics. We show that this compositional design is the driving force for the development of the high piezoelectric properties. So, we find that this phenomenon can be explained by the stabilization of a Rhombohedral鈥揟etragonal (R鈥揟) phase boundary close to room temperature, that facilities the polarization process of the system and exhibits a significantly high piezoelectric response with a d₃₃ value as high as 鈭?00 pC/N, which is comparable to part soft PZTs. As a result, we believe that the general strategy and design principles described in this study open the possibility of obtaining (K,Na)NbO₃-based lead-free ceramics with enhanced properties, expanding their application range.