Department of Materials Science and Engineering, Korea University, Seoul, Korea.
IEEE Trans Ultrason Ferroelectr Freq Control. 2009 Nov;56(11):2337-42. doi: 10.1109/TUFFC.2009.1321.
Various amounts of Nb(2)O(5) in the (Na(0.5)K(0.5)) NbO(3) (NKN) ceramic were replaced by V(2)O(5) to decrease its sintering temperature to below 950 degrees C. A small V(2)O(5) content resulted in a dense microstructure with an increased grain size for the specimen sintered at 900 degrees C due to the presence of a liquid phase. When V(2)O(5) was added to the NKN ceramics, their orthorhombic-to-tetragonal transition temperature increased from 178 degrees C to around 200 degrees C. However, their Curie temperature decreased from 402 degrees C to around 330 degrees C. The k(p), epsilon(3) (T)/epsilon(0), and Q(m) values increased with V(2)O(5) addition, probably due to the increased density and poling state, which was identified by the phase angle. The specimen with x = 0.05, sintered at 900 degrees C for 8 h, exhibited the following piezoelectric properties: k(p) = 0.32, epsilon(3) (T)/epsilon(0) = 245, d(33) = 120 (pC/N), and Q(m) = 232.
将不同量的 Nb(2)O(5) 替代 (Na(0.5)K(0.5)) NbO(3) (NKN) 陶瓷中的一部分，以将其烧结温度降低至 950°C 以下。由于存在液相，少量的 V(2)O(5) 会导致在 900°C 下烧结的样品具有更致密的微观结构和更大的晶粒尺寸。当 V(2)O(5) 添加到 NKN 陶瓷中时，它们的正交-四方相变温度从 178°C 增加到约 200°C。然而，它们的居里温度从 402°C 降低到约 330°C。k(p)、ε(3)(T)/ε(0) 和 Q(m) 值随着 V(2)O(5) 的添加而增加，这可能是由于密度和极化状态的增加，这可以通过相位角来确定。在 x = 0.05 的样品中，在 900°C 下烧结 8 小时，表现出以下压电性能：k(p) = 0.32，ε(3)(T)/ε(0) = 245，d(33) = 120(pC/N)，Q(m) = 232。
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