Fabrication of 〈100〉-oriented Bi(Mg_0.5Ti_0.5)O₃-modified BiFeO₃-BaTiO₃ ceramics and their piezoelectric properties

Abstract

Rhombohedral Bi(Mg0.5Ti0.5)O3-modified BiFeO3-BaTiO3 ceramics were successfully textured along the non-polar <100> direction using the templated grain growth process for the first time. The textured 0.90{0.33BaTiO3-0.67BiFeO3}0.10Bi(Mg0.5Ti0.5)O3 (33BTBF-10BMT) ceramics were fabricated by 33BTBF-10BMT matrix with BT templates. The orientation degree was investigated by various sintering temperature, and the 80% oriented 33BTBF-10BMT along the <100> direction was achieved at a relatively high sintering temperature. However, the orientation degree abruptly decreased at the highest sintering temperature of 1100 oC due to the large pores and low relative density. Based on the analysis of the unipolar strain measurements, the highest strain and d 33 * values were observed in the textured ceramics with 80% orientation. These textured ceramics exhibited approximately 0.3% strain and a d 33 * exceeding 400 pm/V, representing approximately 1.5 times higher values compared to the nontextured ceramics.

Investigation of the crystal-oriented behavior of rare earth substituted Sr2NaNb5O15 lead-free piezoelectric materials under a high magnetic field

“…Various lead-free piezoelectric materials, such as (K,Na)NbO 3 -based, (Bi,Na)TiO 3 -based, (Sr,Ca) 2 NaNb 5 O 15 (SCNN), and bismuth layer-structured ferroelectrics have been actively studied and reported to have certain advantages over PZT. [10][11][12][13][14][15][16][17][18][19][20] The c-axis crystal-oriented SCNN ceramics have good piezoelectric properties and outstanding high-power properties compared to hard-PZT, and have also demonstrated a superior performance as an ultrasonic motor using ceramics for highpower ultrasonic devices in our previous studies. 15,16,[21][22][23][24][25][26][27][28] However, there are challenges that must be addressed to achieve mass production.…”

Bulk photovoltaic effect in ferroelectrics

“…The strong offcentering of the constituent atoms provides a large P s exceeding 100 μC cm −2 . 92) Owning to its attractive features, many researchers have investigated the ferroelectric, 93,94) magnetic, [95][96][97] piezoelectric, [98][99][100][101] capacitive, 102) and structural [103][104][105][106] properties of BFO and its solid solutions. The relatively small E g coexisting with the massive P s has motivated us to investigate their fundamental PV properties 4,16,22,56,107,108) and to develop PV devices.…”