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000056074 1001_ $$0P:(DE-Juel1)VDB5279$$aBirnbaum, U.$$b0$$uFZJ
000056074 245__ $$aThe hydrogen economy: technology, logistics and economics
000056074 260__ $$aLondon$$bManey$$c2006
000056074 300__ $$a152 - 157
000056074 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000056074 440_0 $$016761$$aEnergy Materials: Materials Science and Engineering for Energy Systems$$v1$$x1748-9237$$y3
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000056074 520__ $$aThe synthetic vanadinites (Pb(x)Ca(10-x))(VO4)6F2delta, 1 < x < 9, adopt a P6(3)/m apatite structure with 9.7590 (1) < or = a < or = 10.1179 (1) A and 7.0434 (3) < or = c < or = 7.4021 (1) A. The partitioning of calcium and lead over the AI(4f) and AII(6h) positions is nonstoichiometric with lead preferentially entering the larger AII site. High-resolution electron microscopy showed that samples annealed for 10 h at 1073 K are in disequilibrium with calcium- and lead-rich microdomains co-existing at unit-cell scales. For (Pb5Ca5)(VO4)6F2delta, sintering in excess of 2 weeks is required for the metals to order macroscopically. As annealing progresses, c/a, the partitioning coefficient kPb(AI/AII) and the AIO6 metaprism twist angle (phi) adjust cooperatively to enlarge the apatite channel, and thereby accommodate higher lead content. These results demonstrate that phi is a sensitive measure of disequilibrium and a useful device for monitoring changes in apatite topology as a function of composition.
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000056074 7001_ $$0P:(DE-Juel1)130461$$aHake, J.-F.$$b1$$uFZJ
000056074 7001_ $$0P:(DE-Juel1)130470$$aLinssen, J.$$b2$$uFZJ
000056074 7001_ $$0P:(DE-Juel1)VDB1907$$aWalbeck, M.$$b3$$uFZJ
000056074 773__ $$0PERI:(DE-600)2391528-6$$a10.1179/174892406X177266$$gVol. 1, p. 152 - 157$$p152 - 157$$q1<152 - 157$$tEnergy materials$$v1$$x1748-9237$$y2006
000056074 8567_ $$uhttp://dx.doi.org/10.1179/174892406X177266
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000056074 9141_ $$aNachtrag$$y2006
000056074 915__ $$0StatID:(DE-HGF)0020$$aNo peer review
000056074 9201_ $$0I:(DE-Juel1)VDB64$$d31.12.2006$$gSTE$$kSTE$$lProgrammgruppe Systemforschung und Technologische Entwicklung$$x0
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