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@ARTICLE{Birnbaum:56074,
      author       = {Birnbaum, U. and Hake, J.-F. and Linssen, J. and Walbeck,
                      M.},
      title        = {{T}he hydrogen economy: technology, logistics and
                      economics},
      journal      = {Energy materials},
      volume       = {1},
      issn         = {1748-9237},
      address      = {London},
      publisher    = {Maney},
      reportid     = {PreJuSER-56074},
      pages        = {152 - 157},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The 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.},
      cin          = {STE},
      ddc          = {620},
      cid          = {I:(DE-Juel1)VDB64},
      pnm          = {Nachhaltige Entwicklung und Technik},
      pid          = {G:(DE-Juel1)FUEK408},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:15017085},
      doi          = {10.1179/174892406X177266},
      url          = {https://juser.fz-juelich.de/record/56074},
}