Thermodynamics and electrophysics of new $\rm LaCaCuZnMnO_6$ copper–zinc manganite of lanthanum and calcium

Copper–zinc lanthanum and calcium manganite $\rm LaCaCuZnMnO_6$ was synthesized from oxides of lanthanum$(\rm III)$, copper$(\rm II)$, zinc$(\rm II)$, manganese$(\rm III)$, and calcium carbonate in the temperature range $1073$–$1473$ K. Nanostructured particles were obtained by grinding the material in a vibratory mill. The heat capacity of the compound was studied in the range of $298.15$–$673$ K on an IT-S-$400$ calorimeter. On dependence curve $C^{\circ}_p \sim f(T)$ at $598$ K, an anomalous jump in heat capacity was detected. The temperature dependences of the electrical resistance and relative permittivity were studied on an LCR-$781$ setup (Taiwan) at $293$–$483$ K and at frequencies of $1{,}~5$, and $10$ kHz. A semiconductor character of the conductivity was established. At $483$ K, an anomalously high value of the permittivity was revealed at all studied frequencies.