Producing sodium niobate texture target germs in a two stage molten salt synthesis comprises preparing crystalline intermediate product from molten salt, and performing topochemical conversion by adding sodium carbonate to the intermediate

摘要

#CMT# #/CMT# Producing sodium niobate texture target germs in a two stage molten salt synthesis comprises: (a) preparing a crystalline intermediate product from a molten salt, in which a number of perovskite crystal layers is separated by an intermediate layer of an another metal oxide; and (b) performing a topochemical conversion by adding sodium carbonate to the intermediate product, via the metal cations, which form intermediate layers in the intermediate products by displacing the sodium cations. #CMT# : #/CMT# Producing sodium niobate texture target germs in a two stage molten salt synthesis comprises: (a) preparing a crystalline intermediate product from a molten salt, in which a number of perovskite crystal layers is separated by an intermediate layer of an another metal oxide; and (b) performing a topochemical conversion by adding sodium carbonate to the intermediate product, via the metal cations, which form intermediate layers in the intermediate products by displacing the sodium cations, where the amount of sodium carbonate is added 1.1-20 times to the intermediate products during the topochemical conversion. #CMT#USE : #/CMT# The process is useful for producing sodium niobate texture target germs, which are useful for texturing the piezoelectric ceramics. #CMT#ADVANTAGE : #/CMT# The process produces sodium niobate texture target germs in high quality. #CMT#INORGANIC CHEMISTRY : #/CMT# Preferred Process: In the process, metal compounds of formula (M1 2O 2[M1(0.5)Na(m-1.5)Nb mO 3 m + 1]) are added as starting materials for the step The step (b) is carried out in a cylindrical aluminum oxide ceramic vessel having a volume of 200-2000 ml. The vessel is completely covered with a corundum plate during the reaction. The amount of added molten salt is measured such that a quantity of 50-500 g of seed material is produced. M1 : Sr, Ba and/or Bi; and m : 1-20. Preferred Components: The amount of sodium carbonate is added 3-4 times to the intermediate products during the topochemical conversion. #CMT#EXAMPLE : #/CMT# No suitable example given.