A dilatometric study of the orthorhombic-tetragonal phase transition in barium sodium niobate

Brillouin spectroscopy of the incommensurate—commensurate phase transition in barium sodium niobate

“…Dilatometric measurements (Abell et al, 1970) of the thermal expansion coefficients revealed that the difference between the orthorhombic lattice parameters (ao and b,) monotonically decreases as the crystal is heated to 300°C. Differential thermal analysis Toledano and Pateau (1974) of the crystal revealed a small thermal effect around 260°C on heating.…”

“Ghost” segregation pattern and ferroelectric domains in mixed calcium‐strontium‐barium niobates

“…In the case of (100) oriented samples, the images of glide bands are located only along [001], and they correspond to the (010) slip planes. The interpretation of these contrast as glide bands needs some further verification, because one cannot fully exclude some thin lamellar inclusions of orthorhombic phase that can be formed during cooling of the crystal similarly as it was discussed in Yoshikawa et al, [27] Vere et al [28] and Abell et al, [29] despite the fact that they were not revealed by the synchrotron topographs.…”

Growth and Characterization of Centimeter‐Sized Ba2LaFeNb4O15 Crystals from High‐Temperature Solution under a Controlled Atmosphere

“…Several deal with pure and rareearth doped BNN growth experiments performed by the Czochralski technique. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Microtwins, related to the orthorhombic structure of BNN, and cracks caused by thermal expansion along the c axis in the ferroelectric phase transition [14,24] are observed in such crystals. Crystalline fibers grown by the laser-heated pedestal growth (LHPG) [25][26][27][28][29] and the micro-pulling-down technique (μ-PD) [30][31][32][33] do not suffer such formation of cracks and twins.…”