TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I) comprises: either solid-phase reaction process comprising (i) weighing carbonate or nitrate of alkali metal (A), oxide of rare earth metals (R and M) and ytterbium, oxide, chloride or sulfate of titanium, (ii) mixing the raw materials, adding absolute ethanol or de-ionized water, grinding or ball milling, discharging and drying to obtain powder, where the mass ratio of the absolute ethanol or de-ionized water to the raw material mixture is 1-3:1 and the mass ratio of the ball milling material of zirconia ball to the raw material mixture is 1-1.5:1, (iii) pre-sintering the powder obtained in the step (ii) at 800-1200 degrees C for 1-6 hours to obtain pre-sintered powder, and (iv) grinding or ball milling the pre-sintered powder obtained in the step (iii), sintering at 1100-1300 degrees C for 2-8 hours, and grinding or ball milling; or solvent thermal reaction process comprising (i) taking de-ionized water, absolute ethanol or ethylene glycol as solvent, hydroxide or oxide of A as solutes, corresponding nitrate of rare earth element (R and M) and ytterbium, and tetraisopropanol titanium, tetrabutyl titanate, titanium sulfate or titanium tetrachloride as titanium source; (ii) weighing and mixing the raw materials, adding deionized water, absolute ethanol and/or ethylene glycol, agitating and dissolving, where the molar ratio of A to titanium is 5.5-20:1, and adding the reaction solution into a stainless steel reaction kettle having polytetrafluoroethylene lining, reacting at 80-280 degrees C for 2-100 hour, and (iii) cooling the reaction mixture to room temperature, filtering, washing and drying; or sol-gel process comprising (i) taking de-ionized water, acetic acid or absolute ethanol as solvent, nitrate of A, nitrate of rare earth elements (R and M) and ytterbium as solutes, and tetraisopropanol titanium, tetrabutyl titanate or titanium tetrachloride as titanium source, (ii) dissolving the nitrate of A in de-ionized water, corresponding nitrate of R, M and ytterbium in acetic acid and titanium source in absolute ethanol to obtain three types of uniform solutions, weighing and mixing three uniform solutions, agitating or performing ultrasonic oscillation for 0.5-3 hours to obtain transparent sol system, and (ii) allowing the obtained transparent sol system to stand for 2-12 hours to obtain wet gel, drying the obtained wet gel for 2-24 hours at 80-110 degrees C to obtain dry gel powder, and calcining the dry gel powder for 0.5-10 hours at 300-1200 degrees C. Preferred Method: In the solvent thermal reaction, the step (iii) comprises washing and neutralizing the filter product with de-ionized water and drying the filter product for 1-24 hours at 10-120 degrees C. Preferred Components: The oxide matrix of the perovskite structure is a titanium trioxide compound of formula (AxR((2-x)/3)TiO3) (II). In the step (ii) of solvent thermal reaction, the reaction mixture comprises 10-1000 ml of solvent per 10 g of raw material. Preferred Definitions:    x = 0.01-0.5;    y = 0.01-0.15; and    z = 0-0.3.