Control of the powder morphology be

Control of the powder morphology before the biaxial hot forging process is an important parameter to enhance the texture of PBN ceramics. A fine and higher anisotropic powder particle favours the formation of a dense and homogeneous microstructure with anisotropic grain growth and/or grain arrangement after hot forging processing. Additionally, a hot forged ceramic from powders with these characteristics has higher microstructural and crystallographic texturing levels than a ceramic obtained from isotropic particle powders. For the as calcined powders with a particle aspect ratio of 5, a high TP, y8, was achieved for the hot biaxially forged Pb0?56Ba0?44Nb2O6 ceramic. Consequently, high dielectric anisotropy factors were observed in PBN ceramics.