Crystallography Open Database

Information card for entry 2003012

2003011 << 2003012 >> 2003013

Preview

Coordinates	2003012.cif
Original paper (by DOI)	HTML

Structure parameters

Formula	K Nb5 O15 Pb2
Calculated formula	K Nb5 O15 Pb3.1
Title of publication	Structures des phases paraélectrique et ferroélectrique de Pb~2~KNb~5~O~15~
Authors of publication	Sciau, Philippe; Calvarin, Gilbert; Ravez, Jean
Journal of publication	Acta Crystallographica Section B
Year of publication	1999
Journal volume	55
Journal issue	4
Pages of publication	459 - 466
a	12.646 ± 0.001 Å
b	12.646 ± 0.001 Å
c	3.9551 ± 0.0002 Å
α	90°
β	90°
γ	90°
Cell volume	632.5 Å³
Cell temperature	790 K
Number of distinct elements	4
Space group number	127
Hermann-Mauguin space group symbol	P 4/m b m
Hall space group symbol	-P 4 2ab
Diffraction radiation wavelength	1.39217 Å
Diffraction radiation type	CuKβ
Has coordinates	Yes
Has disorder	No
Has F_obs	No

Version history

Revision	Date	Message	Files
277834 (current)	2022-09-14	cif/ Added space group information derived from the space group operation list using the 'cif_filter' program.	2003012.cif
188483	2016-11-16	cif/ Updating bibliography for entries 2003012, 2003013, 2003014, 2003015, 6000252, 6000253, 6000254 and marking entries 6000252, 6000253, 6000254 as duplicates of entries 2003012, 2003014, 2003015.	2003012.cif
26848	2011-09-28	cif/2/, hkl/2/, html/ Reorganising CIFs of the range 2* into the "prefix-directory" tree.	2003012.cif
1150	2010-05-06	cif/2/ Correcting journal volume number and adding missing bibliographic information in 7 series 2 entries.	2003012.cif
966	2010-01-30	cif/ Adding _cod_database_code tags to all COD entries. Adding tag description to the cif_cod.dic dictionary so that COD entries can be validated.	2003012.cif
846	2009-11-14	cif/ Fixing _journal_volume values that had series letters prepended to them. Now the series letters are appended to the _journal_name_full, if needed, and the _journal_volume is purely numeric. To mimimise textual changes to CIFs this was done in several stages. First of all, a list of _journal_volume was compiled from the COD CIF collection: bash -xc 'find ? -name \*.cif \ \| xargs cif_values \ --file \ --tag _journal_volume' \ >& cod-journal-volumes-`-date`.log & giving us a cod-journal-volumes-2009.11.13.log file (committed for reference as well). Then a list of volume names with letters was extracted and most of them transformed automatically into a correct form: awk '$3~/^[A-Z][0-9]/' cod-journal-volumes-2009.11.13.log \ \| awk '{print $1}' \ \| xargs -n1 -iI \ bash -c 'echo === I ===;\ awk "/^#/,/^data_/{print}/^data_/{exit}" I > tmp-$$; \ cif_adjust_journal_name_volume I \ \| grep -E "_journal_name_full\|_journal_volume" >> tmp-$$; \ awk "/^data_/,/\$eof/" I \ \| grep -vE "^(data_\|_journal_name_full\|_journal_volume)" >> tmp-$$;\ mv -v tmp-$$ I' Note that this procedure assumes that all tags are at the beginning of the line, each value follows its tag on the same line, and there is only one tag per line. This procedure is not suitable for general CIFs, but fortunately, only very few CIFs in COD do not conform these rules. After the automatic conversion, a syntax check was run: svn st ? \ \| awk '{print $NF}' \ \| xargs -n1 -iI sh -c 'echo -n I"\r"; vcif -l 2048 I \|\| echo "!!! I !!!\n"' Entries that were found to have errors (very few, less than 10) were reverted and fixed manually. The entries that had letters embedded into them were grepped separately: awk '$3~/[A-Z][0-9]/' cod-journal-volumes-2009.11.13.log \ \| awk '$3~/^[^A-Z]/' and fixed manually. After all fixes, the previous 'vcif' test was rerun, yielding no syntax errors, and in addition a 'cif_filter' roundtrip test was run: svn st ? \ \| awk '{print $NF}' \ \| xargs -n1 -iI \ bash -c ' \ echo -en I "\r"; \ diff \ <(cif_filter I >& /dev/null) \ <(cif_filter I \| cif_filter >& /dev/null) \ \|\| echo "!!! I !!!\n"' This last test discovered one misspelled '_journal_yrae' tag in the 2/2003193.cif entry that was fixed by hand.	2003012.cif
720	2009-05-13	cod/cif/: Adding loop_ token in front of the _publ_author_name tag in all COD entries where _publ_author_name was not in a loop (this tag is loop-mandatory).	2003012.cif
274	2008-03-16	20 CIFs fixed 2002996.cif presented a lot of spurious bibliographic data commented out with ##	2003012.cif
19	2008-01-26	Changing all end-of-line codes from DOS style to UNIX style in all COD CIF files, for more convenient processing: In the cod/cif/ directory: ff \*.cif \| xargs perl -i -pe 's/\r\n/\n/'	2003012.cif
14	2008-01-14	Appending a header with SVN keywords, COD URL and copying policy to all COD CIF files.	2003012.cif
13	2008-01-13	Setting the svn:keywords property to "Author Date Revision URL Id" for all CIF files in the cod/cif directory.	2003012.cif
1	2007-11-30	Adding all .cif files from the COD, downloaded in a Cod.zip file on 2007.02.07 (and the same Cod.zip is downloadable today, on 2007.11.29)	2003012.cif