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    • 45. 发明授权
    • Ferroelectric ceramic compound, a ferroelectric ceramic single crystal, and preparation processes thereof
    • 铁电陶瓷复合物,铁电陶瓷单晶及其制备方法
    • US07527690B2
    • 2009-05-05
    • US10551355
    • 2003-07-30
    • Sang-Goo LeeMin-Chan KimByung-Ju ChoiMin-Chul ShinSu-Han Yu
    • Sang-Goo LeeMin-Chan KimByung-Ju ChoiMin-Chul ShinSu-Han Yu
    • C30B11/04
    • C01G33/006C01P2006/40C30B11/00C30B29/22H01G7/06H01L21/3147H01L21/31691H01L41/18
    • The present invention relates to a ferroelectric ceramic compound having the composition of the following formula: s[L]−x[P]y[M]z[N]p[T], a ferroelectric ceramic single crystal, and preparation processes thereof. The ferroelectric ceramic compound and the single crystal according to the present invention are relaxor ferroelectrics having high piezoelectricity, a high electromechanical coefficient and a high electrooptical coefficient, and are useful for manufacturing tunable filters for radio communication, optical communication devices, surface acoustic wave devices, and the like. Particularly, the process of preparing the single crystal according to the present invention enables preparation of a single crystal having a diameter of 5 cm or greater and a single crystal wafer with uniform composition. In the formula, [P] is lead oxide, [M] is magnesium oxide or zinc oxide, [N] is niobium oxide, [T] is titanium oxide, [L] is one selected from the group consisting of lithium tantalate or lithium niobate, lithium, lithium oxide, platinum, indium, palladium, rhodium, nickel, cobalt, iron, strontium, scandium, ruthenium, copper, yttrium, and ytterbium or mixtures thereof, and x, y, z, p and s are defined as 0.55
    • 本发明涉及具有下式的组成的铁电陶瓷化合物及其制备方法:s [L] -x [P] y [M] z [N] p [T],铁电陶瓷单晶。 根据本发明的铁电陶瓷化合物和单晶是具有高压电性,高机电系数和高电光系数的弛豫铁电体,并且可用于制造用于无线电通信的可调谐滤波器,光通信装置,表面声波装置, 等等。 特别地,根据本发明的制备单晶的方法能够制备直径为5cm以上的单晶和具有均匀组成的单晶晶片。 在该式中,[P]是氧化铅,[M]是氧化镁或氧化锌,[N]是氧化铌,[T]是氧化钛,[L]是选自钽酸锂或锂 铌酸锂,锂,氧化锂,铂,铟,钯,铑,镍,钴,铁,锶,钪,钌,铜,钇和镱或其混合物,x,y,z,p和s定义为 0.55
    • 47. 发明申请
    • CLAMP-ON ULTRASONIC FLOW RATE MEASURING DEVICE HAVING AUTOMATIC PIPE THICKNESS MEASURING FUNCTION
    • US20170153136A1
    • 2017-06-01
    • US15361425
    • 2016-11-27
    • Min-Chul SHIN
    • Min-Chul SHIN
    • G01F1/66G01B17/02
    • G01F1/662G01B17/02G01F1/002G01F1/667G01F15/00G01F25/0007
    • A clamp on type of an ultrasonic flow rate-measuring device attached to an outer wall and having an automatic pipe thickness measuring function is disclosed. The ultrasonic flow rate measuring-device includes an automatic pipe thickness measuring function. The ultrasonic flow rate-measuring device is fixed to the outer diameter of a pipe of which the material is known but the thickness is unknown. The ultrasonic flow rate-measuring device adopts a resonant frequency, which generates a maximum voltage level during frequency sweeping through the entire path. Thus, the ultrasonic flow rate-measuring device measures the resonant frequency by using an average resonant frequency through the entire path of an ultrasonic wave, wherein the entire path corresponds to a path in which an ultrasonic wave radiated from one of a pair of ultrasonic transducers passes through one side of a pipe wall and passes inside of the pipe and passes through the other side of the pipe wall to the other one of the pair of ultrasonic transducers, thereby accurately measuring the thickness of a pipe even when an actual thickness of a pipe is changed by solid sludge or any other contamination. Both sides of the pipe wall correspond to thickness portions of the pipe. The ultrasonic flow rate-measuring device accurately determinates an inner area of pipe conduit by automatically inputting a previously measured actual pipe thickness to a flow calculating equation, so that accuracy of flow measurement is enhanced. It should be noted that the present invention is suitable for an actual field situation where various kinds of contaminations in the pipe exist.