NOVELTY - Dielectric composition comprises a metal complex (I).    USE - The dielectric composition is useful in a composite material, an energy storage device preferably capacitors and batteries, and in an energy generation device, preferably fuel cell (all claimed), where the energy storage devices are devices used in vehicles, such as electric vehicles, hybrid electric vehicles (preferably hybrid electric automobiles), actuators, electronic devices, such as computers, electronic flash units, and video cameras, and the energy storage devices are used in military and aerospace applications and in down-hole oil and gas exploration technology.    ADVANTAGE - The dielectric composition provides devices with high energy density storage applications. The dielectric materials: have heterogeneously distributed conductivity that may generate barrier layer effects; and enable reduced tunneling probability of ionic species and increased breakdown voltages of grains relative to electronically conducting barrier layer capacitors.    DETAILED DESCRIPTION - Dielectric composition comprises a metal complex of formula (((M1)1-x(A1)x)((M2)1-y-z(B2)y(C2)z)O3-a(Vo)a) (I).    M1 = Ba, Mg, Ca, Sr and/or Pb;    A1 = K, Na, Li and/or Ag;    M2 = Ti, Zr, Hf, Ce, Sn, (Mg1/3, Nb2/3), (Zn1/3, Nb2/3) and/or (Sc1/2, Ta1/2);    B2 = Sc, Al, Y, La, Fe, Yb, Ho, Tm, Sb, Sm, Nd, Gd, Er, Pr, Mo and/or Dy;    C2 = V, Mn, Cr, Fe, Ni, Cu, Zn, Ca and/or Mg;    (Vo)a = oxygen vacancies;    x = 0.0-0.4;    y, z = 0.00-0.40; and    a = less than or equal to 0.5x x+0.5x y+z.    INDEPENDENT CLAIMS are included for:    (1) a protonated dielectric compound of formula (((M1)1-x(A1)x)((M2)1-y-z(B2)y(C2)z)O3-a+h(Vo)a(H.)2h) (II) or ((M11-x1A1x1)(M21-y1-z1B2y1C2z1)O3H.(x1+y1+2z1)) (III);    (2) preparing (II) comprising forming a mixture of oxides or precursors of oxides comprising barium, titanium and dopant oxide, combining the mixture with a liquid to form a slurry, calcining the slurry to form a calcined product, milling the calcined product to produce a milled powder, compressing the milled powder to form a preform, sintering the preform at 1000-1500 degrees C to produce a sintered product, exposing the sintered product to steam at 20-700 degrees C at 0.1-100 pound force per square inch for 1-24 hours;    (3) a composite material comprising a dielectric material for generating an ionic-based- barrier-layer (IBBL) effect and an electrolyte comprising ionomeric electrolytes and/or solid-state protonic electrolytes, or an electrochemically active material disposed at grain boundaries of the dielectric material, where the dielectric materials are lithium ion conducting dielectric materials, silver ion conducting dielectric materials, sodium ion conducting dielectric materials and/or oxygen ion conducting dielectric materials, the silver ion conducting dielectric materials is silver iodide, silver telluride, silver selenide, silver sulfide bromide, silver sulfide iodide, rubidium silver iodide, potassium silver iodide, ammonium silver iodide, potassium-silver compound of formula (K1-bCsbAg4I5) (iii), rubidium-silver compound of formula (Rb1-bCsbAg4I5) (iv), cesium-silver-chloride-bromide-iodide complex (CsAg4ClBr2I2), silver-iodide-tungsten-oxygen complex (Ag6I4WO4) and/or cesium-silver compound of formula (CsAg4Br1-bI2+b) (v), the sodium ion conducting dielectric material is sodium chloride, sodium sulfide and/or sodium beta -alumina, the oxygen ion conducting dielectric material is a bismuth compound of formula (Bi2(M3eV1-e)O6-b) (vi), bismuth-cupper compound of formula (Bi2(Cu(0.1)V(0.9))O6-b) (vi), calcium oxide compound of formula ((1-b)CaO-bG1O2) (vii), calcium oxide-zirconium oxide compound (0.2 CaO-0.8 ZrO2), yttrium oxide-zirconium oxide compound (0.04 Y2O3-0.92 ZrO2) and /or zirconium oxide compound of formula ((1-b)G22O3-bZrO2) (viii), and the electrochemically active material comprises aluminum hydroxide, magnesium hydroxide, calcium hydroxide , strontium hydroxide, barium hydroxide, cobalt(II) hydroxide, lithium oxide, sodium oxide, potassium oxide, or layered double hydroxides of formula ((M2+1-cM3+c(OH)2)(c+)(J(m-)(c/m).nH2O)(c-)) (ix) or ((M+1-dM3+d(OH)2)(2d-1)+(J(m-)(2d-1)/m.nH2O)(d-)) (x); and    (4) an energy storage device and an energy generation device comprising the dielectric material.    h = greater than 0.00 and less than or equal to a;    a = h to 0.5x x+0.5x y+z;    x1, y1, z1 = greater than 0.00 and less than 0.40;    H. = proton incorporated at an oxygen site;    b = greater than 0 and less than 1;    M3 = Cu, Co, Zn, Ge, Ca, Sr, Ni, Fe, Mn and/or Mg;    G1 = Zr, Hf, Th and/or Ce;    G2 = La, Sm, Y, Yb, Sc and/or Ga;    e = not defined;    c = 0.1-0.5;    m = greater than 1 and less than 3;    n = 2-4;    d = 0.2-0.4;    M2+ = Mg, Ni, Zn, Co, Fe, Ca and/or Mn;    M3+ = Al, Fe, Cr and/or Mn;    M+ = Li, Na, K and/or Ag; and    J = CO32-, SO42-, OH-, and/or Cl-.