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Pyrolysis. -The title ceramics with a microstructure consisting of necked submicron particles are synthesized by ultrasonic aerosol spray pyrolysis from HNO3 solutions containing stoichiometric amounts of CuO, Mn2O3, and CaCO3. The samples are characterized by powder XRD, SEM, and magnetic measurements. The material exhibits a colossal magnetoresistance of about 10% under magnetic fields of 1 T at a temperature ≤200 K. -(VOLKOVA, O. S.; GOODILIN*, E. A.; CHEKANOVA, A. E.; VERESOV, A. G.; KNOTKO, A. V.; VASILIEV, A. N.; TRETYAKOV, Y. D.; Mendeleev Commun. 2005, 4, 131-133; Dep. Mater. Sci., Lomonosov Moscow State Univ., Moscow 119992, Russia; Eng.) -W. Pewestorf 41-008

Nanostructured precursors prepared by ultrasonic aerosol spray pyrolisys at 750–950°C in air were applied for the first time to obtain Ca(Cu,Mn)7O12 colossal magnetoresistance ceramics with a unique submicron necked‐grain microstructure. It was observed that a high contribution of intergrain tunneling magnetoresistance results in a 10–20% difference in functional properties as dependent on morphological features of hollow precursor microspheres ASP processed at a given temperature.