Study on optimizing ultrasonic irradiation period for thick polycrystalline PZT film by hydrothermal method
K. Ohta, G. Isobe, P. Bornmann, T. Hemsel, T. Morita, Ultrasonics 53 (2013) 837–841.

Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics
T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, T. Hemsel, Journal of Korean Physical Society 57 (2010) 924–928.

(K,Na)NbO3 lead-free piezoelectric ceramics synthesized from hydrothermal powders
T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, T. Hemsel, Materials Letters 64 (2010) 125–128.