By Tadashi Takenaka, Hajime Haneda, Kazumi Kato, Masasuke Takata, Kazuo Shinozaki
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Extra resources for Asian Ceramic Science for Electronics III and Electroceramics in Japan XII: Proceedings of the 6th Asian Meeting on Electroceramics and the 28th ... Japan, Oc
All the crystals exhibit two dielectric anomalies at Td and Tm. Td is the depolarization temperature which corresponds to the transition from a ferroelectric state to so-called “anti-ferroelectric” state, while Tm is the temperature at which εr reaches a maximum value and corresponds to a transition from an “anti-ferroelectric state” to a paraelectric state . As shown in Fig. 3, the dielectric peaks at Td are strongly frequency dependent, which implies a relaxor phase transition. In addition, the Tm dielectric peaks for all the crystals are very broad, suggesting that a diffuse phase transition occurs around the Tm.
It is well known that PZT ceramics exhibit enhanced piezoelectric properties in relation to their MPB structure. For PZT ceramics, two different ferroelectric tetragonal and rhombohedral phases coexist in one grain. Before TEM observation, it was expected that the BT-KN ceramics might have MPB region similar to that of PZT ceramics. However, the TEM observation revealed that for BT-KN ceramics, two different ferroelectric tetragonal and orthorhombic phases exist separately in different grains at room temperature.
Ceramics? The results in Fig. 6 suggest that the phase boundary between the two different phases was effective for property enhancement. 9KN can be regarded as a “wide-band MPB” region. 5KN ceramics, piezoelectric properties can increase with decreasing grain sizes. CONCLUSIONS The previous phase diagram of BT-KN system was confirmed by high-temperature XRD and dielectric measurement, and it was discussed that two phases coexistence region of the BT-KN system might be regarded as similar MPB to that of PZT or not.