MAGNETOVOLUME AND MAGNETOELASTIC EFFECTS IN TERNARY CR-RU-MO ALLOYS

The influence of Mo additions on the unusual magnetoelastic properties and Invar-type behavior of a Cr0.997Ru0.003 antiferromagnetic alloy w as investigated. Measurements were done of the temperature dependence of the thermal-expansion coefficient and bulk modulus of (Cr1-xMox)(0. 997)Ru-0.003 alloys with 0 less than or equal to x less than or equal to 0.07. Well-defined magnetic anomalies were observed at the Neel tem perature implying large magnetic contributions to the thermal expansio n and the bulk modulus, making these alloys suitable to be analyzed an d parameterized in terms of existing theories. The addition of Mo to C r0.997Ru0.003 completely suppresses the presence of the commensurate s pin density wave phase for x greater than or equal to 0.015 and does n ot improve the Invar-type behavior to a desired level that may be usef ul for practical applications. (C) 1996 American Institute of Physics. (C) 1996 American Institute of Physics.