Preparation and dielectric properties of unfilled tungsten bronze ferroelectrics Ba4RETiNb9O30

Role of structural modulation in electrical properties of tungsten bronze (Ca0.28Ba0.72)2.5−0.5Na Nb5O15 ceramics

“…[(B1) 2 (B2) 8 ]O 30 have received considerable attention due to their superior electro-optic, dielectric, ferroelectric and pyroelectric properties [1][2][3][4][5]. In the formula and crystal lattice structure, A1, A2, B and C sites are 12-, 15-, 6-and 9-fold coordinated oxygen octahedral sites, respectively.…”

Investigation of anisotropic mechanical properties of textured KSr2Nb5O15 ceramics via ab‐initio calculation and nanoindentation

“…Tungsten bronze lattice has a tetragonal structure with a general formula of (A1) 4 (A2) 2 C 4 (B) 10 O 30 , typified by oxygen octahedrals sharing their corners in a complex manner that yields 3 types of openings: A (A1 and A2), B, and C, as shown in Figure 1. The A1 (second largest), A2 (largest), and C (smallest) cavities have a cuboctahedral coordination of oxygen atoms, are pentacapped pentagonal prismatic, and have tricapped trigonal prismatic coordination, respectively.…”

“…In addition to perovskite structures, such as BaTiO 3 , K 0.5 Na 0.5 NbO 3 , (Na, Bi)TiO 3 , and bismuth‐layered structures, lead‐free ferroelectrics, tungsten bronze (TB) structure compounds have attracted significant attention in recent years. This interest stems from the fact that these compounds have excellent dielectric, electro‐optic, piezoelectric, and pyroelectric properties . KSr 2 Nb 5 O 15 (KSN) is characterized by a tetragonal tungsten bronze ferroelectric structure and exhibits excellent electric properties similar to those of Sr 1‐x Ba x Nb 2 O 6 .…”

“…This interest stems from the fact that these compounds have excellent dielectric, electro-optic, piezoelectric, and pyroelectric properties. [9][10][11] KSr 2 Nb 5 O 15 (KSN) is characterized by a tetragonal tungsten bronze ferroelectric structure and exhibits excellent electric properties similar to those of Sr 1-x Ba x Nb 2 O 6 . [12][13][14] Singlecrystal KSN exhibits superior electro-optic properties to LiNbO 3 at room temperature.…”

Relaxor behavior and ferroelectric properties of a new Ba 4 SmFe 0.5 Nb 9.5 O 30 tungsten bronze ceramic

“…There are three different types of interstices, termed A, B and C, which can accommodate types of cations. According to the degree of the cations occupying interstices, the TB structure can be divided into three types: the first is stuffed TB with a formula of (A 1 ) 2 (A 2 ) 4 (C) 4 (B 1 ) 2 (B 2 ) 8 O 30 [1] with all interstices occupied; the second is filled TB with the stoichiometry of A 6 B 10 O 30 in which the smallest site C is empty, whereas the other interstices are occupied; and the third is unfilled TB, which has the formula of A 5 B 10 O 30 in which the smallest interstice C and also one of the A sites is empty [11,12].…”