Structural and Magnetic Properties of Sintered Materials on the Basis of Zinc Oxide

Structural and magnetic properties of ceramics Zn1-xCoxO and Zn1-xCrxO are studied. Average sizes of grains are determined by scanning electron microscopy. The magnetic field dependences of magnetic susceptibility are investigated by Faraday method. The relevant theoretical models are chosen.

Magnetic Measurements on YBa(2)Cu(3)O(x) Ceramic High Temperature Superconductors

ABSTRACTStatic magnetic susceptibilities have been measured, following the Faraday method, on a disc of home-made YBa(2)Cu(3)O(x). The superconducting ceramic disc was oriented perpendicular to the applied magnetic induction field < 10 mT. On cooling the sample in a constant field from above to below the critical temperature a Meissner-Ochsenfeld effect is observed. The interpretation of the data yields partial flux expulsion. That the flux is not completely expelled from the sample is understood on the basis of the flatness of the disc. Part of the flux which had not been expelled by the Meissner-Ochsenfeld effect remains trapped in the cooled superconducting material.

Etude Magnétique des sels alcalins de quelques amino acides

Using the Faraday method molar magnetic susceptibilities of the alkali metal salts M(NH2—R—COO) of several amino acids[Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text]have been determined.Using the Veiel method, the magnetic susceptibilities of the anions (NH2—R—COO−) were deduced.