Abstract:
The present invention relates to a method of preparing a thin film element which is a dielectric exhibiting piezoelectric properties comprising a bismuth-based solid solution ceramic material as well as uses thereof. In one aspect, the present inventions provides a method for fabricating a lead-free piezoelectric thin film element comprising a substrate and a piezoelectric thin film formed thereon, wherein said piezoelectric thin film is a solid solution ceramic material having a major proportion of a perovskite phase and having the formula (I) below : (I): xA-yB-z 1 C 1 -z 2 C 2 wherein A is a first bismuth based perovskite component; B is a second bismuth based perovskite component; C 1 and C 2 are dopant perovskite components; and wherein: x+y+z 1 +z 2 = 1; x, y≠ 0; (z 1 + z 2 ) ≥ 0; said method comprising: performing steps i) and ii) below one or more times: i) depositing a precursor solution for the ceramic material of formula (I) on to the substrate by chemical solution deposition to form a deposited precursor solution on the substrate; ii) drying and pyrolysing the deposited precursor solution to form a coating; followed by performing step iii) below: iii) crystallising the coating by rapid thermal processing to form a film of the solid solution ceramic material of formula (I); wherein crystallising in step iii) involves heating the coating to a crystallisation temperature of from 600 °C to 800 °C; and wherein the temperature is increased at a ramp rate of from 70 to 150 °C/s up to the crystallisation temperature.
Abstract:
A piezoelectric micromachined ultrasonic transducer (PMUT) device includes a substrate having an opening therethrough and a membrane attached to the substrate over the opening. An actuating structure layer on a surface of the membrane includes a piezoelectric layer sandwiched between the membrane and an upper electrode layer. The actuating structure layer is patterned to selectively remove portions of the actuating structure from portions of the membrane to form a central portion proximate a center of the open cavity and three or more rib portions projecting radially outward from the central portion.
Abstract:
The present invention discloses a method of preparing a lead-free piezoelectric thin film comprising the steps of: providing a precursor solution comprising at least one alkali metal ion, a polyamino carboxylic acid, and an amine; depositing the precursor solution on a substrate to form a film; and annealing the film. The present invention also provides a lead-free piezoelectric thin film prepared according to the method, a precursor solution for use in the method and a method of preparing the precursor solution.
Abstract:
The invention refers to a method for producing a biocompatible material of the formula Na x K y NbO 3 , 0≤x≤0.8, 0.2≤y≤1, x+y=1, comprising the steps of: (i) providing a Na-precursor and a K-precursor for Na x K y NbO 3 ; (ii) mixing the precursors in solution, whereby they first react to form a sol and thereafter a gel; and heat treating the gel to obtain an oxide of the material Na x K y NbO 3 , 0≤x≤0.8, 0.2≤y≤1, x+y=1. Hereby, a biocompatible material having several advantages, such as a highly controlled composition, is produced. Further, the invention refers to a method for producing a film comprising the material, as well as a material and a film produced by the method of the invention. Moreover, the invention refers to an implant comprising the biocompatible film of the invention.
Abstract translation:本发明涉及一种制备式Na生物相容性材料的方法,其中0 = x = 0.8,0.2 = y = 1,x + y = 1,包括以下步骤:(i)提供Na +前体和K-前体,用于Na + > 3 SUB>; (ii)将前体在溶液中混合,由此它们首先反应形成溶胶,然后凝胶; 并且对所述凝胶进行热处理以获得所述材料的氧化物,所述氧化物为Na 2 O 3,NbO 3,0 = x = 0.8,0.2 = y = 1,x + y = 1。 因此,生产具有几个优点的生物相容性材料,例如高度控制的组合物。 此外,本发明涉及一种制造包含该材料的膜的方法,以及通过本发明的方法制备的材料和膜。 此外,本发明涉及包含本发明的生物相容性膜的植入物。