Molten salt synthesis of anisometric KSr2Nb5O15 particles

Molten Salt Synthesis of Ceramic Powders

“…The substitution reaction of alkali ions for alkaline earth ions is positively used for the preparation of needlelike AM (Zhao et al, 2005;Yang et al, 2007). Interesting ion-exchange reaction between the solid oxide and molten chloride is reported in the preparation of RbCa 2 Nb 3 O 10 at 800°C (Geselbracht et al, 2002 …”

Topochemical Synthesis of Micron‐Platelet (Na0.5K0.5)NbO3 Particles

“…The synthesis of anisotropic seeds with a proper scale in the range of 5-50 µm is a key procedure for the preparation of textured ceramics. [5] Recently, it was reported that (Li,Ta,Sb)-modified (Na 0.5 K 0.5 )NbO 3 materials with the plate-like seeds of NaNbO 3 exhibited a high d 33 value by the (R)TGG method. [6] Since the (R)TGG method requires anisometric particles with a lattice match of the desired final composition, [7] platelet (Na 0.5 K 0.5 )NbO 3 particles is a promising choice to synthesize texture (Na 0.5 K 0.5 )NbO 3 -based ceramics.…”

Progress on the fabrication of lead-free textured piezoelectric ceramics: perspectives over 25 years

“…Therefore, it should be noted that the anisometric template particles play a significant role in the development and formation of texture in lead-free piezoelectric ceramics. There is a considerable literature on the research of anisotropically shaped particles to fabricate the ideal template for lead-free textured piezoelectric ceramics [21][22][23][24][25][26][27][28].…”

“…The lead-free systems [1] are (1) perovskites, i.e., BaTiO 3 , Bi 0.5 Na 0.5 TiO 3 , KNbO 3 , etc., (2) non-perovskites, i.e., bismuth layer-structured ferroelectrics (BLSF), tungsten-bronze type ferroelectrics, etc. In the latter system (bismuth layer-structured and tungsten-bronze type ferroelectrics) with low crystallographic symmetry, particles with an anisometric shape can be easily synthesized by MSS, for example, Bi 4 Ti 3 O 12 [39,43,44], Bi 2.5 Na 3.5 Nb 5 O 18 [7], KSr 2 Nb 5 O 15 [24,26,27,45,46] and so on. However, for the pervoskite structure materials with high crystallographic symmetry, particles with a large aspect ratio are difficult to prepare directly, for example, KNbO 3 [47], NaNbO 3 [7,25,[48][49][50], BaBi 4 Ti 4 O 15 [51][52][53], and so on.…”