Structure transformations in sputter-deposited Sm$sub 2$Co$sub 17$ alloys

Conference · Wed Jan 01 04:00:00 EST 1975 · AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 683-684

OSTI ID:4151250

Wang, R; Allen, R P

A series of structure transformations were observed for thick, sputter- deposited amorphous Sm$sub 2$Co$sub 17$ alloys heat treated between 500 and 900$sup 0$C for one hour. The amorphous phase crystallized at approximately 500$sup 0$C to give a CaCu$sub 5$-type structure with a c/a ratio of 0.86, which is the highest value ever observed for these alloys. With increasing annealing temperature, the c parameter decreased and the a parameter increased resulting in a continuous reduction of the c/a ratio to a value of 0.84 at 800$sup 0$C, which is the same as that of the Th$sub 2$Zn$sub 17$-type structure. These structure transformations and lattice parameter variations are attributed to a progressive change with annealing in the number and degree of order of Sm-atom/Co-atom pair substitutions. Based on a correlation found between the c/a ratio and composition for the CaCu$sub 5$-type Sm--Co alloys, the metastable phase crystallized from the amorphous state at 500$sup 0$C has an approximate formula of Sm$sub 2$Co$sub 24$ to Sm$sub 2$Co$sub 26$. (auth)

• Research Organization: Battelle Pacific Northwest Labs., Richland, WA
• NSA Number: NSA-33-003612
• OSTI ID: 4151250
• Conference Information: Journal Name: AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 683-684
• Country of Publication: United States
• Language: English

Related Subjects

*COBALT BASE ALLOYS-- PHASE TRANSFORMATIONS
*SAMARIUM ALLOYS-- PHASE TRANSFORMATIONS
360102* --Materials--Metals & Alloys--Structure & Phase Studies
AMORPHOUS STATE
ANNEALING
INTERMETALLIC COMPOUNDS
LATTICE PARAMETERS
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
SPUTTERING