IRband/ Assignments of bands/peaks [cm.sup.-1] 3404.2 Water symmetry structure 2329.63 Presence of Si-H bond 1776.63 Attributed to water bending 1497.57 Vibration of oxygen ion for gadolinium 837.63 Vibrations of molybdate ions ([Mo.sub.7][O.sub.24]) 578.83 Presence of metal oxygen bond Table 4: Results of thermal decomposition for different temperature ranges with observed and calculated weight loss for mixed crystal with composition GdCaMo7O24-8H2O.
The crystal growth in gels at room temperature pioneered by Henisch and coworkers [6, 7] has been fully exploited in the investigation of growth and characterization of rare earth mixed crystals of Sm-Ba molybdate by Isac and Ittyachen .
. Berlin: Springer-Verlag, 1984: 388pp.
The newest hypothesis, the Mixed Crystal
Hypothesis according to Scholten , confines itself to the description of the acting mechanisms in a PE-X weld (Fig.
This brought about many mixed crystals
, including Y-type zeolite, Faujasite Na (PDF number 12-0246), X-type zeolite (PDF number 410118), and P-type zeolite (PDF number 44-0052).
Filipowicz, "Raman scattering in CuInS[2.sub.x][Se.sub.2(1-x)] mixed crystals
," Journal of Physics: Condensed Matter, vol.
However, their mixed crystals
have not been investigated.
NIST scientists are attempting to nullify the birefringence by using mixed crystals
of calcium fluoride and barium fluoride, a substance that exhibits opposite birefringence behavior.
The first [ILLUSTRATION FOR FIGURE 12 OMITTED] was given the now discredited name "breislakite." The name is still used by local collectors, as "breislakite" is now known to be either ludwigite or vonsenite, the two occurring together and even as mixed crystals
at this locality, and being indistinguishable without chemical analysis.
The basic structure of the lamellar mixed crystals
consists of apatitic lamellas sandwiching an OCP lamella (20).
Necessary conditions for the occurrence of mixed crystals
(crystals containing more than one species) are: 1) good miscibility and/or compatibility of the mers and 2) metric and chemical similarity of the chains.
NIST researchers are pursuing potential solutions to the problem involving mixed crystals
to compensate for the birefringence effect.