The invention discloses a self-
assembly bi-phase
composite ceramic powder, which is characterized in that the
powder has a molecular formula of Ba(1-x1-x2-x3-ySrx1Cax2Ax3Ry)Ti(1-zMz)O3, wherein, 0<=x1<=0.18, 0.21<=x2<=0.90, 0.0001<=x3<=0.13, 0.0001<=y<=0.05, 0<=z<=0.20; A is a bivalent element of Mg, Pb, Zn, Cu or Cr, R is La, Pr, Nd, Sm, Eu, Gd, Tb, Dy or Er, and M is a quadrivalent element of Zr, Ce, Cu or Sn. The
composite ceramic includes two phases, the content of
barium in the first phase is larger than the
calcium content, and the
calcium content in the second phase is larger than the
barium content. The
ceramic powder has the features of stress
luminescence and
electroluminescence, and can be used for the
stress distribution measurement and
adhesive strength measurement of various parts and members and
in plane illumination devices. The parts can be luminous when being coated with
ceramic powder on surfaces and applied with stress. The
luminous intensity of stress
luminescence is in direct ratio with the applied stress in the elastic limit.