Hierarchical domains in Na1/2Bi1/2TiO3 single crystals: Ferroelectric phase transformations within the geometrical restrictions of a ferroelastic inheritance

Abstract

; Luo, Liang; et al., "Hierarchical domains in Na1/2Bi1/2TiO3 single crystals: Ferroelectric phase transformations within the geometrical restrictions of a ferroelastic inheritance," Appl. Phys. Lett. 96, 222905 (2010); http://dx

The influence of Mn substitution on the local structure of Na0.5Bi0.5TiO3 crystals: Increased ferroelectric ordering and coexisting octahedral tilts

“…Piezoresponse force microscopy (PFM) has revealed that ferroelectric R nanodomains nucleate within the geometrical restrictions of the T ferroelastic domains. 22 Support of these observations has also been reported by anelastic measurements. 6 High resolution transmission electron microscopy (HRTEM) has shown that the lattice is partially incoherent across the boundaries between polar nano-regions.…”

“…paraelectric tetragonal (T) ! ferroelectric rhombohedral (R) on cooling, [15][16][17][18][19][20][21][22] with transition temperatures of about 550 and 300 C, respectively. It has been proposed that NBT has an intermediate orthorhombic bridging phase between T and R ones.…”

Observation of partially incoherent ⟨110⟩ boundaries between polar nanodomains in Na1/2Bi1/2TiO3 single crystals

“…These results clearly demonstrate that the ferroelastic domains are not related to FE ones and those polar nanoregions nucleate within them on cooling into the R phase, as recently reported. 22 Next, a typical TEM bright-field image is shown in Fig. 2.…”

“…Recently, temperature dependent domain studies of NBT by polarized light microscopy ͑PLM͒ have shown that T ferroelastic domains persist on cooling into the R phase field and by comparisons with piezoforce microscopy ͑PFM͒ images it was found that FE R nanodomains nucleate within the geometrical restrictions of the ferroelastic domains. 22 These T domains are true ͑i.e., proper͒ ferroelastic domains and are not related to stress accommodation of the FE ones ͑i.e., improper͒. The persistence of the ferroelastic domains ͑formed under the condition of c / a Ͼ 1͒ into the R phase field ͑where c / a Ϸ 1͒ may complicate FE nanodomain nucleation.…”

Effect of Mn substituents on the domain and local structures of Na1/2Bi1/2TiO3–BaTiO3 single crystals near a morphotropic phase boundary

“…5 Recent piezoresponse force microscopy ͑PFM͒ studies of the domain structure of NBTx%BT have shown with increasing x, as the MPB is approached, that ͑i͒ the size of polar nanoregions is decreased and their self-organization enhanced; and ͑ii͒ the formation of proper ferroelastic domains is suppressed, and rather improper ones are favored that form below the FE Curie temperature to elastically accommodate the FE domains. 7,8 It is known near the MPB of Pb͑Mg 1/3 Nb 2/3 ͒ O 3 -x%PbTiO 3 ͑PMN-x%PT͒ and Pb͑Zn 1/3 Nb 2/3 ͒ O 3 -x%PbTiO 3 ͑PZN-x%PT͒ crystals that high piezoelectric properties are achieved by low symmetry monoclinic ͑M͒ phases that structurally bridge R and T phases. [9][10][11][12][13] However, to date, no intermediate bridging M phases have been found in NBT-BT; thus the mechanism of piezoelectric property enhancement remains in question.…”