AHfO(3) (A = Ca, Sr and Ba) belongs to perovskite family with general
formula A(2+)B(4+)O(3). The crystal structure of CaHfO(3) (CH), SrHfO(3)
(SH) and BaHfO(3) (BH) at room temperature (RT) is reported, combining
the results of the Rietveld method refinements using X-ray and neutron
powder diffraction data and PAC spectroscopy. The structures were
refined by the Rietveld Method using DBWS9411 and GSAS programs, The
refinement of SH using neutron and X-ray powder pattern indicates an
orthorhombic Pnma symmetry at room temperature. The hyperfine parameters
of PAC spectroscopy indicate that the structure has lower-than-cubic
symmetry at RT, The structures of CH and BH were refined with the Pnma
and Pm (3) over bar m space group respectively. The three compounds have
near regular oxygen octahedra that are characteristic of perovskites of
Glazer types a(+)a(-)a(-) and a(0)a(0)a(0), for which the distortion is
better related to the tilting of the octahedra.
%0 Conference Paper
%1 WOS:000074945400113
%A Guevara, JA
%A Cuffini, SL
%A Mascarenhas, YP
%A Carbonio, RE
%A Alonso, JA
%A Fernandez, MT
%A de la Presa, P
%A Ayala, A
%A Garcia, AL
%B EPDIC 5, PTS 1 AND 2
%C LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH, SWITZERLAND
%D 1998
%E Mittemeijer, R Delhez and EJ
%I TRANS TECH PUBLICATIONS LTD
%K X-ray diffraction; neutron octahedra powder tilting} {perovskites;
%P 720-725
%R 10.4028/www.scientific.net/MSF.278-281.720
%T The structure of orthorhombic hafniates by neutron powder diffraction
and perturbed-angular-correlation spectroscopy (PAC)
%V 278-2
%X AHfO(3) (A = Ca, Sr and Ba) belongs to perovskite family with general
formula A(2+)B(4+)O(3). The crystal structure of CaHfO(3) (CH), SrHfO(3)
(SH) and BaHfO(3) (BH) at room temperature (RT) is reported, combining
the results of the Rietveld method refinements using X-ray and neutron
powder diffraction data and PAC spectroscopy. The structures were
refined by the Rietveld Method using DBWS9411 and GSAS programs, The
refinement of SH using neutron and X-ray powder pattern indicates an
orthorhombic Pnma symmetry at room temperature. The hyperfine parameters
of PAC spectroscopy indicate that the structure has lower-than-cubic
symmetry at RT, The structures of CH and BH were refined with the Pnma
and Pm (3) over bar m space group respectively. The three compounds have
near regular oxygen octahedra that are characteristic of perovskites of
Glazer types a(+)a(-)a(-) and a(0)a(0)a(0), for which the distortion is
better related to the tilting of the octahedra.
@inproceedings{WOS:000074945400113,
abstract = {AHfO(3) (A = Ca, Sr and Ba) belongs to perovskite family with general
formula A(2+)B(4+)O(3). The crystal structure of CaHfO(3) (CH), SrHfO(3)
(SH) and BaHfO(3) (BH) at room temperature (RT) is reported, combining
the results of the Rietveld method refinements using X-ray and neutron
powder diffraction data and PAC spectroscopy. The structures were
refined by the Rietveld Method using DBWS9411 and GSAS programs, The
refinement of SH using neutron and X-ray powder pattern indicates an
orthorhombic Pnma symmetry at room temperature. The hyperfine parameters
of PAC spectroscopy indicate that the structure has lower-than-cubic
symmetry at RT, The structures of CH and BH were refined with the Pnma
and Pm (3) over bar m space group respectively. The three compounds have
near regular oxygen octahedra that are characteristic of perovskites of
Glazer types a(+)a(-)a(-) and a(0)a(0)a(0), for which the distortion is
better related to the tilting of the octahedra.},
added-at = {2022-05-23T20:00:14.000+0200},
address = {LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH, SWITZERLAND},
author = {Guevara, JA and Cuffini, SL and Mascarenhas, YP and Carbonio, RE and Alonso, JA and Fernandez, MT and de la Presa, P and Ayala, A and Garcia, AL},
biburl = {https://www.bibsonomy.org/bibtex/2f5e5175e3edd0170786943aca8abf985/ppgfis_ufc_br},
booktitle = {EPDIC 5, PTS 1 AND 2},
doi = {10.4028/www.scientific.net/MSF.278-281.720},
editor = {Mittemeijer, R {Delhez and EJ}},
interhash = {cfa76d0cab3f98872d78cd87135a1c35},
intrahash = {f5e5175e3edd0170786943aca8abf985},
issn = {0255-5476},
keywords = {X-ray diffraction; neutron octahedra powder tilting} {perovskites;},
note = {5th European Powder Diffraction Conference (EPDIC 5), PARMA, ITALY, MAY
25-28, 1997},
organization = {Phillips Anal},
pages = {720-725},
publisher = {TRANS TECH PUBLICATIONS LTD},
pubstate = {published},
series = {Materials Science Forum},
timestamp = {2022-05-23T20:00:14.000+0200},
title = {The structure of orthorhombic hafniates by neutron powder diffraction
and perturbed-angular-correlation spectroscopy (PAC)},
tppubtype = {inproceedings},
volume = {278-2},
year = 1998
}