公开(公告)号：US3676082A

公开(公告)日：1972-07-11

申请号：US3676082D

申请日：1967-05-19

Applicant: RCA CORP

Inventor： ROBBINS MURRAY

IPC: C22C28/00 ,  H01F1/40 ,  H01L21/00 ,  C01B19/00 ,  H01F1/00 ,  H01F1/06

CPC classification number: H01F1/40 ,  C22C28/00 ,  H01L21/00

Abstract: A NEW MAGNETIC MATERIAL COMPRISES THE MOLAR FORMULA MM''2Z3+YX1- WHERE: X CONSISTS ESSENTIALLY OF AT LEAST ONE OF THE CHALCOGENIDES, S2-,SE2-,TE2-;X CONSISTS ESSENTIALLY OF AT LEAST ONE OF THE HALIDES, C1-,BR-,I-; M CONSISTS ESSENTIALLY OD COPPER IONS; M'' CONSISTS ESSENTIALLY OF CHROMIUM IONS; AND Y IS A NUMBER FROM ZERO TO LESS THAN 1. VALUES OF Y EXITS ABOVE WHICH THE MATERIAL BEHAVES AS A CONDUCTOR AND AT OR BELOW WHICH THE MATERIAL BEHAVES AS A SEMICONDUCTOR. THE COMPOSITIONS ARE GENERALLY IN THE SPINEL CRYSTAL CLASS AND ARE USEFUL IN MAGNETIC AND SEMICONDUCTOR DEVICES. A METHOD OF PREPARING THE ABOVE MATERIAL COMPRISES FIRST MIXING THE STARTING MATERIALS COPPER HALIDE, CHROMIUM, CHALCOGEN AND COPPER IN THE MOLAR RATIOS TO GIVE THE DESIRED PRODUCT. THEN PRESSED PELLETS OF THE MIXTURE ARE FORMED AND PLACED IN EVACUTATED QUARTZ TUBES. THE PELLETS ARE THEN FIRED FOR AT LEAST 10 HOURS AT 700-800*C.