21st line 2; 199026 St. Petersburg, Russia
Phone/Fax: +7 (812) 328-8640 email: rmo@minsoc.ru
founded in 1817
XI RMS General Meeting and the Fedorov Session 2010
Saint Petersburg, Russia
11-14 October 2010
2010minsoc.ru
http://www.minsoc.ru/2010/
Ðóññêèé Site map
Conferences & Meetings XI RMS General Meeting “Modern mineralogy: from theory to practice” combined with the Fedorov Session 2010
print print version
 

Locations of visitors to this page
News
MinSoc Info
Membership
Branches
Commissions
Awards
Conferences & Meetings
Zapiski RMO (Journal)
e-Library
EMU
IMA
Links
Guestbook
Help
re-registered: 931
yesterday: 158
week:
users: 2745
active: 2320
organizations: 750
departments: 435
useful links: 66
announced: 26
registration open: 1
total: 2007
PDF: 1986
issues: 547
articles: 9606
PDF of abstracts: 2156
fulltext articles: 3830
records: 43
fulltext PDF: 9
Presentations
| search |
Crystal-chemistry of earth alkaline hydrogen arsenates: crystal strcture and vibrational spectra of a new Ba(AsO3OH) polymorphic variety

RMS-DPI code:  2010-1-173-1
Scientific session:  F2. Mineralogical crystallography and crystal chemistry.
Author listing:  Djordjevic T., Karanović L.
Principal author:  Djordjevic Tamara
Language:  English
Abstract - Summary 
(short description):
New polymorphic variety of Ba(AsO3OH) has been obtained using hydrothermal method. Itrepresents one new structure type. Its crystal structure was determined from a racemic twin by single-crystal X-ray diffraction at 120 and 293 K [space group P21, a = 7.2149(14) / 7.2370(2), b = 7.7028(15) / 7.7133(2), c = 21.7385(43) / 21.8079 Å, b = 95.95(3) / 96.073(1)°, V = 1201.6(4) / 1210.51(5) ų, Z = 12]. The structure refinement of the data collected at 120 K did not reveal significant changes and did not indicate any phase transition. The crystal structure of Ba(AsO3OH) has a layered character and can be divided into four types of regularly alternating layers parallel to (001). Each layer shares common O atoms and OH groups with adjacent layers. All these layers host different kinds of BaO7(OH)2 and BaO8(OH)2 polyhedra and isolated, slightly distorted AsO3OH tetrahedra. These tetrahedra are linked through three O atoms and one OH group to four Ba atoms in the same layer i.e. AsO3OH tetrahedra are chelating to two Ba atoms and bridged by another two Ba atoms. The OH group acts as hydrogen bond donor toward the oxygen atoms positioned in the same or adjacent layers. In all layers neighboring BaO7(OH)2 and BaO8(OH)2 polyhedra form zigzag chains along b-axis sharing edges or trigonal faces. These polyhedra are additionally connected by hydrogen bonds involving all hydroxyl groups. Raman and infrared spectra were acquired to obtain further information on both anion groups and especially on the very short hydrogen bond distances, where the donor and acceptor atoms are not equal due to (average) space-group symmetry.
 
Date of presentation:  14/10/2010
Time of presentation:  16:00
Presentation Place:  Mining University, Hall 1166
 
RMS-DPI code:  2010-1-173-1
Proceeedings volume 
in the RMS catalogue:
 
Modern mineralogy: from theory to practice
Pages:  88-89
File of proceedings 
(PDF): 
 271 K
Status:  printed
Recieved:  21/05/2010
Accepted:  15/07/2010
Published on-line:  21/11/2010
Permanent address of publication:  http://www.minsoc.ru/2010-1-173-1/
Contact author(s):  Djordjevic, Tamara
 

Error. Page cannot be displayed. Please contact your service provider for more details. (29)



site administrator: adminminsoc.ru (Docent Morozov, Mikhail)
registration | forgot password?
 
about registration
RMS distribution list service
Subscribe
NEW !!! RMS 200th Anniversary Meeting 2017
RMS for You:  PDF (37k)
RMS Directory
List of organizations

"Zapiski RMO" online
New Books

e-Prints:
RMS Annual Session and Fedorov Session 2012
General Meeting and Fedorov Session 2010
Minerals as Advanced Materials II
Annual Session 2009
Annual Session 2008
Fedorov Session 2008
TBG-XIII & APIFIS-IV
Crystallogenesis&Mineralogy'07
Annual Session 2007
Annual Session 2006
Fedorov Session 2006

Competitions:
2009
2008
2007
ßíäåêñ.Ìåòðèêà
turk porno
ankara escort
tuzla escort
liseli porno
huluhub.com
seks filmi izle