Local structure analysis of (Na_0.5K_0.45Li_0.05)NbO₃synthesized by malic acid complex solution method

Abstract

A monoclinic ferroelectric phase with the space group Pm has been discovered in lead-free (Na0.5K0.45Li0.05)NbO3 solid solution ceramics synthesized by a malic acid complex solution method. At ambient temperature, the lattice parameters of this monoclinic structure were . The average and local structures of this monoclinic phase were analyzed by synchrotron X-ray measurements. The average structure maintained the monoclinic structure down to 20 K, although the local structure changed below room temperature. The distinct short-range order structure was found to be rhombohedral. The results demonstrate the presence of an order–disorder-type phase transition structurally bridging between the rhombohedral local structure and the low-symmetry monoclinic average structure in a (Na0.5K0.45Li0.05)NbO3 solid solution system.

Local structure and phase transitions of KNbO3

“…21) This combination was found to be very effective on Nb-related perovskite materials. [22][23][24][25][26] 2. Experimental procedure KNbO 3 ceramic samples were synthesized by a modified conventional ceramic fabrication process.…”

Piezoelectric Properties and Local Structure of (Na_0.50K_0.45Li_0.05)NbO₃－Ca(Zr_0.50Ti_0.50)O₃ Solid Solutions Produced by Malic Acid Complex Solution Method

“…Similarly, based on PDF refinements for NKLN CZT0 and NKLN CZT6, the local structure is rhombohedral, as is clear from Fig. 4(b) [15], which shows observed PDFs in the range 1.2 ≤ r ≤ 4.2 Å for NKLN  CZT0, NKLN  CZT2 and NKLN  CZT6 at 300 K. It can be seen from the figure that the PDF peaks at approximately 4.0 and 3.4 Å correspond to the unit cell size in the perovskite structure and (Na,K,Li)  Nb bonds, respectively, and they appear at almost the same position for the three samples. Moreover, the first and second nearest-neighbor bond lengths correspond to the bonds between Nb and O at approximately 2.0 Å and (Na,K,Li) and O at approximately 2.8 Å , respectively.…”

(Li,Na,K)NbO3-based multilayer piezoceramic with Ag/Pd inner electrodes

“…Thus, LNKN-based piezoceramics physical properties, [7][8][9][10][11][12][13][14][15] fatigue characteristics, [16][17][18][19] and improvement of the piezo properties [20][21][22][23][24][25][26][27] have been studied by various researchers. Moreover, alkaline niobate piezoceramic-based applications are being developed, such as ultrasonic motors, inkjet heads, electric buzzers, and knocking sensors.…”