Accession Number : AD0674520

Title :   ANOMALOUS BEHAVIOR OF THE ELASTIC CONSTANTS OF GADOLINIUM,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF ENGINEERING

Personal Author(s) : Long,Marshall , Jr

Report Date : JUL 1968

Pagination or Media Count : 57

Abstract : The elastic constants C sub 33 and C sub 44 of single crystal gadolinium have been examined as a function of temperature (range: 77K to 330K) by means of an acoustical pulse-overlap technique. An anomaly in the elastic constant C sub 33 was seen whereby its value decreased about 2%, and then returned to normal. This anomaly occurred over a 30K temperature range with a minimum at about 222K. There was no evidence of such an effect in C sub 44. Magnetic fields of up to 12K Oe were applied either along the unique axis or in the basal plane which eliminated the effect. The origin of this anomaly is believed to lie with the change in spontaneous moment alignment which is coupled to the acoustic wave by means of a volume magnetostriction. (Author)

Descriptors :   (*GADOLINIUM, MAGNETIC PROPERTIES), ELASTIC PROPERTIES, PHASE STUDIES, TRANSITION TEMPERATURE, SOUND TRANSMISSION, BAND THEORY OF SOLIDS, CRYSTAL STRUCTURE, ANOMALIES, ANISOTROPY, MAGNETOSTRICTION, CRYOGENICS, MAGNETIC MOMENTS, THESES

Subject Categories : Properties of Metals and Alloys
      Electricity and Magnetism
      Mechanics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE