Crystals of Pb3Mn7O15 doped with titanium ions have been synthesized. The study the structural properties showed that occupy positions in “columns” between planes, which leads to a weakening exchange interaction planes. temperature dependences magnetization and heat capacity revealed two anomalies at 62 K 35 K. At K, long-range magnetic order presumably appears, spin-reorientation transition oc...

Abstract. Pleysteinite, [(H2O)0.5K0.5]2Mn2Al3(PO4)4F2(H2O)10 ⚫ 4H2O, is the aluminium analogue of benyacarite, from Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany. It was found in specimens altered zwieselite, association with nordgauite, fluellite, rockbridgeite, pyrite and columbite. Pleysteinite occurs as isolated small aggregates colourless, stubby prisms that are typically 10 to 30 µ...

Abstract The structure family of the rare‐earth calcium oxoborates O[BO 3 ] (RCOB) has been investigated mainly with regard to their optical characteristics. Due monoclinic‐domatic they exhibit pyro‐ and piezoelectric properties, which is not dependent on numerous possible substitutions cation site R . cations are known show partial disorder earth alkaline positions X Z To study whether a stabi...