An aluminum nitride sintered body contains 1 to 5% by weight of yttrium oxide (Y.sub.2O.sub.3), 10 to 100 ppm by weight of titanium (Ti), and the balance being aluminum nitride (AlN). Accordingly, a volume resistance value and thermal conductivity at a high temperature are improved, and the generation of impurities during a semiconductor manufacturing process can be suppressed.

A lead-free piezoelectric material includes perovskite-type metal oxide containing Na, Nb, Ba, Ti, and Mg and indicates excellent piezoelectric properties. The piezoelectric material satisfies the following relational expression (1): 0.430≤a≤0.460, 0.433≤b≤0.479, 0.040≤c≤0.070, 0.0125≤d≤0.0650, 0.0015≤e≤0.0092, 0.9×3e≤c−d≤1.1×3e, a+b+c+d+e=1, where a, b, c, d, and e denote the relative numbers of Na, Nb, Ba, Ti, and Mg atoms, respectively.

A lead-free piezoelectric material includes perovskite-type metal oxide containing Na, Nb, Ba, Ti, and Mg and indicates excellent piezoelectric properties. The piezoelectric material satisfies the following relational expression (1): 0.430≤a≤0.460, 0.433≤b≤0.479, 0.040≤c≤0.070, 0.0125≤d≤0.0650, 0.0015≤e≤0.0092, 0.9×3e≤c−d≤1.1×3e, a+b+c+d+e=1, where a, b, c, d, and e denote the relative numbers of Na, Nb, Ba, Ti, and Mg atoms, respectively.

Green ceramic mixtures include at least one inorganic component, at least one organic binder, and a stable emulsion including at least one lubricant, at least one aqueous solvent, and at least one emulsifier. Methods for forming ceramic bodies include forming a green ceramic mixture including a stable emulsion and extruding the green ceramic mixture. The methods and green ceramic mixtures can be used to produce green and fired ceramic bodies.

Green ceramic mixtures include at least one inorganic component, at least one organic binder, and a stable emulsion including at least one lubricant, at least one aqueous solvent, and at least one emulsifier. Methods for forming ceramic bodies include forming a green ceramic mixture including a stable emulsion and extruding the green ceramic mixture. The methods and green ceramic mixtures can be used to produce green and fired ceramic bodies.

The sintered body has an average particle size in the range of 0.1 μm or more and 5 μm or less, includes gamet-type oxide base material particles having at least Li, La, and Zr, has 8% by volume or more of voids, and has an ionic conductivity of 1.0×10.sup.−5 S/cm or more at temperature of 25° C.

The sintered body has an average particle size in the range of 0.1 μm or more and 5 μm or less, includes gamet-type oxide base material particles having at least Li, La, and Zr, has 8% by volume or more of voids, and has an ionic conductivity of 1.0×10.sup.−5 S/cm or more at temperature of 25° C.

Batch mixtures comprising alumina trihydrate for forming ceramic honeycomb bodies comprised of cordierite and methods of manufacturing honeycomb bodies from such batch mixtures are provided.

Batch mixtures comprising alumina trihydrate for forming ceramic honeycomb bodies comprised of cordierite and methods of manufacturing honeycomb bodies from such batch mixtures are provided.

A method for forming a sintered composition including providing a slurry precursor including a lithium-, sodium-, or magnesium-based compound; tape casting the slurry precursor to form a green tape; and sintering the green tape at a temperature in a range of 500° C. to 1350° C. for a time in a range of less than 60 min to form a sintered composition, such that the slurry precursor further includes a solvent and dispersant. The dispersant may include an amine compound, a carboxylic acid compound, or combinations, mixtures, or salts thereof.