NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
results of the ttf-tcnq- and the calcium carbonate-crystallization on the long duration exposure facilityExperiment AO139A on the Long Duration Exposure Facility (LDEF) carried four large containers into orbit for five years with crystal growth solutions for lead sulfide, calcium carbonate, and tetra thiafulvalene- tetra cyanoquino methane (TTF-TCNQ). The LDEF was in excellent condition after the long orbital stay, and although the temperature data was lost, the experiment program had been working since the valves in all containers were opened. All four experiments produced crystals; however, they were of varying quality. The calcium carbonate crystals had the best appearance. The TTF-TCNQ crystals were packed together near the valve openings of the container. When taken apart, the single crystals showed some unusual morphological properties. X-ray investigations as well as conductivity measurements on the long duration space grown TTF-TCNQ crystals are presented, and pictures of the calcium carbonate are shown. Comparisons are made with previous space solution growth experiments on the European Spacelab Mission and the Apollo-Soyuz Test Project.
Document ID
19910015779
Document Type
Conference Paper
Authors
Nielsen, Kjeld Flemming
(Technical Univ. of Denmark Lyngby., United States)
Lind, M. David
(Rockwell International Science Center Thousand Oaks, CA., United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1991
Publication Information
Publication: NASA, Langley Research Center, First LDEF Post-Retrieval Symposium Abstracts
Subject Category
SOLID-STATE PHYSICS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19910015658Analytic PrimaryFirst LDEF Post-Retrieval Symposium abstracts