Patent ID: 7160614
Filing Date: 2007-01-09
Classification: B82Y,C09K,D01F,Y10S,Y10T

Abstract:
1. A complex material composed of crystalline superfine particles having a grain size in the range from 5 nm to 100 nm and the surface thereof is covered by surfactant and another material, and emitting light depending upon the time-rate-of-change of a stress applied thereto, wherein the crystalline superfine particle has a composition expressed by the general formula A 0.8≦x≦1.1 1.8≦y≦2.2 {(2x+3y)/2}−0.2<z<{(2x+3y)/2}+0.2 A=Sr B=Al D=Y wherein a rare earth element or a transition metal element is added by 0.2 mol or less in total relative to 1 mol of A wherein weight percent of the crystalline superfine particles is from 30% to 80%.