Abstract
The aim of this work is to complete a study previously initiated by us on the synthesis, characterization and magnetic properties of the lanthanide orthoborates. The different LnBO 3 compounds were obtained by mixing metal hydroxides Ln(OH) 3 and orthoboric acid B(OH) 3 in stoichiometric amounts at low temperatures between 873 and 973 K and at pressures of between 10 −4 and 10 −5 mmHg. This method had been previously successfully applied to the isolation of the other lanthanide orthoborates. The characterization of these materials was carried out by X-ray powder diffraction and IR spectrometry. The magnetic susceptibilities of these compounds were measured in the temperature range 4.2–300 K. The susceptibilities of PrBO 3 and YbBO 3 obey the Curie-Weiss law from 300 to 30 K, but deviations from this law occur at lower temperatures. The temperature dependences of the magnetic susceptibilities of SmBO 3 and EuBO 3 were also studied.
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