Ibule Photonics Co., Ltd.

Idbule Photonics Co., Ltd.

Min-Chan Kim

Sang-Goo Lee

Min-Chul Shin

Young-Gwan Ko

Sung-Min Rhim

Wha-Young Lee

Su-Han Yu

In-Kyu Song

Byung-Ju Choi

Gil-Seon Kang

The present invention relates to a ferroelectric ceramic compound having the composition of the following formula: s[L]&#x2212;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&#x3c;x&#x3c;0.60, 0.09&#x3c;y&#x3c;0.20, 0.09&#x3c;z&#x3c;0.20, 0.01&#x3c;p&#x3c;0.27 and 0.01&#x3c;s&#x3c;0.1, respectively.

Ferroelectric ceramic compound, a ferroelectric ceramic single crystal, and preparation processes thereof

A ferroelectric single crystal having the composition of formula (I) has a high Piezoelectric constant together with good electromechanical and electrooptical properties and it can be prepared in a size of 5 cm in diameter or greater, useful for preparing various devices: x(A)y(B)z(C)-p(P)n(N); (I) wherein, (A) is Pb(Mg&frac13; Nb&frac23;)O3 or Pb(Zn&frac13;Nb&frac23;)O3, (B) is PbTiO3, (C) is LiTaO3, (P) is a metal selected from the group consisting of Pt, Au, Ag, Pd and Rh, (N) is an oxide of a metal selected from the group consisting of Ni, Co, Fe, Sr, Sc, Ru, Cu and Cd, x is a number in the range of 0.65 to 0.98, y is a number in the range fo 0.01 to 0.34, z is a number in the range of 0.01 to 0.1, and p and n are each independently a number in the range of 0.01 to 5.

Ferroelectric single crystal wafer and process for the preparation thereof

Composite metal material, preparation thereof and photocatalytic process using same

Growing community of inventors

Cheju-si, South Korea

Min-Chan Kim