#
# arev:/usr/local/unicat/unireq/beamreq/req00037.txt
# UNICAT Member Beam Time Request  #37

# created Tue Dec 22 13:17:41 CST 1998
#

days:
	4

description:
	Antiferroelectric coupling was observed by our group for the first time
	in single crystals Pb(Ma1/3Nb2/3)O3 and in Pb(Sc,Nb)O3, both systems
	exhibit relaxor ferroelectric behavior. We believe the relaxor properties
	can be understood based upon a dipolar glass model which requires two
	necessary conditions: (1) random displacements of polar species, e.g. Pb
	in these cases; and (2) two competing interactions such as ferroelectric
	(FE) and antiferroelectric (AFE) coupling.  The proposed study involves low-temperature
	thermal diffuse scattering measurements of several positions in the
	reciprocal space to track the FE and AFE fluctuations in relation to teh
	temperature and 1:1 short range order. The temperature range required is
	from ~30K to room temperature.

equipment+required:
	Displex and solid state detector (or harmonic free monochromatic beam.)

experiment:
	Thermal Diffuse Scattering in PMN and PSN

hazards:
	None.

name:
	Haydn Chen

new+request:
	on

nonmembers:
	None

station:
	33ID-D

unacceptable+dates:
	Jan. 20 - Feb. 5.
	Feb. 20 - Mar. 5.
	Mar. 12 - Mar. 31.
	



#QUERY_STRING: 
#REMOTE_HOST: uni-sec.mrl.uiuc.edu
#REMOTE_ADDR: 128.174.102.114
#CONTENT_LENGTH: 1188
#HTTP_REFERER: http://www.uni.aps.anl.gov/unireq.htm
#HTTP_USER_AGENT: Mozilla/4.06 (Macintosh; I; PPC, Nav)