The invention discloses a
dielectric material with a positive linear
capacitance temperature change rate, and a preparation method thereof. According to the preparation method, [(1-x)BaTiO3-xBiyNazTiO3] is taken as a base material, and Nb2O5, RE2O3, MnCO3, and BiBO3 are added, wherein x=0.05-0.15, y=0.4=0.6, z=0.4-0.6,
molar ratio of BaTiO3 to BiyNazTiO3 is (1-x):x, and RE is used for representing one or a plurality of elements selected from Sm, Er, or Ce. The
dielectric material is suitable for preparing multilayer
ceramic capacitors with a positive linear
capacitance temperature change rate, and is low in
dielectric loss;
working temperature ranges from -55 to 150 DEG C, temperature stability is excellent (-15%<=
delta C / C<=15%), and temperature changing accords with positive linear changing in the
working temperature range. In the temperature range
ranging from -55 to 150 DEG C,
capacitance temperature compensating capacitors can be prepared from the dielectric material, compensating of negative effects caused by
capacitor temperature increasing in functional circuits is realized, balancing of charge capacity in the whole temperature section is realized, and circuit stability and reliability are improved. The dielectric material possesses a promising industrialization prospect, and extremely high industrial application value.