Nomenclature of the perovskite supergroup: A hierarchical system of classification based on structure and composition

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Marco E. Ciriotti
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Nomenclature of the perovskite supergroup: A hierarchical system of classification based on structure and composition

Messaggio da Marco E. Ciriotti » gio 27 ott, 2016 16:01

Prossima pubblicazione.

Referenza:
▪ Mitchell, R., Welch, M.D., Chakhmouradian, A.R. (2017): Nomenclature of the perovskite supergroup: A hierarchical system of classification based on crystal structure and composition. Mineralogical Magazine, 81, (in press).

Abstract:
On the basis of extensive studies of synthetic perovskite-structured compounds it is possible to derive a hierarchy of hettotype structures which are derivatives of the arisotypic cubic perovskite structure (ABX3), exemplified by SrTiO3 (tausonite) or KMgF3 (parascandolaite) by: (1) tilting and distortion of the BX6 octahedra; (2) ordering of A- and B-site cations; (3) formation of A-, B- or X site vacancies. This hierarchical scheme can be applied to some naturally-occurring oxides, fluorides, hydroxides, chlorides, arsenides, intermetallic compounds and silicates which adopt such derivative crystal structures. Application of this hierarchical scheme to naturally-occurring minerals results in the recognition of a perovskite supergroup which is divided into stoichiometric and non stoichiometric perovskite groups, with both groups further divided into single ABX3 or double A2BBX6 perovskites. Subgroups, and potential subgroups, of stoichiometric perovskites include: (1) silicate single perovskites of the bridgmanite subgroup; (2) oxide single perovskites of the perovskite subgroup (tausonite, perovskite, loparite, lueshite, isolueshite, lakargiite, megawite); (3) oxide single perovskites of the macedonite subgroup which exhibit second order Jahn-Teller distortions (macedonite, barioperovskite); (4) fluoride single perovskites of the neighborite subgroup (neighborite, parascandolaite); (5) chloride single perovskites of the chlorocalcite subgroup (6) B-site cation ordered double fluoride perovskites of the cryolite subgroup (cryolite, elpasolite; simmonsite); (7) B-site cation ordered oxide double perovskites of the vapnikite subgroup (vapnikite, (?) latrappite). Non-stoichiometric perovskites include: (1) A-site vacant double hydroxides, or hydroxide perovskites, belonging to the söhngeite, schoenfliesite, and stottite subgroups; (2) Anion-deficient perovskites of the brownmillerite subgroup (srebrodolskite, shulamitite); (3) A-site vacant quadruple perovskites (skutterudite subgroup); (4) B-site vacant single perovskites of the oskarssonite subgroup [oskarssonite,waimirite-(Y)]; (5) B-site vacant inverse single perovskites of the cohenite and auricupride subgroups; (6) B-site vacant double perovskites of the diaboleite subgroup; (7) anion-deficient partly-inverse B-site quadruple perovskites of the hematophanite subgroup.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
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Re: Nomenclature of the perovskite supergroup: A hierarchical system of classification based on structure and compositio

Messaggio da Marco E. Ciriotti » lun 10 apr, 2017 14:34

Referenza:
▪ Mitchell, R., Welch, M.D., Chakhmouradian, A.R. (2017): Nomenclature of the perovskite supergroup: A hierarchical system of classification based on crystal structure and composition. Mineralogical Magazine, 81, 411–461.

Abstract:
On the basis of extensive studies of synthetic perovskite-structured compounds it is possible to derive a hierarchy of hettotype structures which are derivatives of the arisotypic cubic perovskite structure (ABX3), exemplified by SrTiO3 (tausonite) or KMgF3 (parascandolaite) by: (1) tilting and distortion of the BX6 octahedra; (2) ordering of A- and B-site cations; (3) formation of A-, B- or X site vacancies. This hierarchical scheme can be applied to some naturally-occurring oxides, fluorides, hydroxides, chlorides, arsenides, intermetallic compounds and silicates which adopt such derivative crystal structures. Application of this hierarchical scheme to naturally-occurring minerals results in the recognition of a perovskite supergroup which is divided into stoichiometric and non stoichiometric perovskite groups, with both groups further divided into single ABX3 or double A2BBX6 perovskites. Subgroups, and potential subgroups, of stoichiometric perovskites include: (1) silicate single perovskites of the bridgmanite subgroup; (2) oxide single perovskites of the perovskite subgroup (tausonite, perovskite, loparite, lueshite, isolueshite, lakargiite, megawite); (3) oxide single perovskites of the macedonite subgroup which exhibit second order Jahn-Teller distortions (macedonite, barioperovskite); (4) fluoride single perovskites of the neighborite subgroup (neighborite, parascandolaite); (5) chloride single perovskites of the chlorocalcite subgroup (6) B-site cation ordered double fluoride perovskites of the cryolite subgroup (cryolite, elpasolite; simmonsite); (7) B-site cation ordered oxide double perovskites of the vapnikite subgroup (vapnikite, (?) latrappite). Non-stoichiometric perovskites include: (1) A-site vacant double hydroxides, or hydroxide perovskites, belonging to the söhngeite, schoenfliesite, and stottite subgroups; (2) Anion-deficient perovskites of the brownmillerite subgroup (srebrodolskite, shulamitite); (3) A-site vacant quadruple perovskites (skutterudite subgroup); (4) B-site vacant single perovskites of the oskarssonite subgroup [oskarssonite,waimirite-(Y)]; (5) B-site vacant inverse single perovskites of the cohenite and auricupride subgroups; (6) B-site vacant double perovskites of the diaboleite subgroup; (7) anion-deficient partly-inverse B-site quadruple perovskites of the hematophanite subgroup.

PS: per gli interessati è disponibile l'intero articolo.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Luciano Vaccari
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Re: Nomenclature of the perovskite supergroup: A hierarchical system of classification based on structure and compositio

Messaggio da Luciano Vaccari » lun 10 apr, 2017 17:36

A tuo comodo Marco, mi interesserebbe.
Grazie in anticipo.
Ben oltre le idee di giusto e di sbagliato c'è un campo. Ti aspetterò laggiù.
(Jalaluddin Rumi- XIII sec.)

Luciano
Socio AMI zona Modena
(Formigine)

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Marco E. Ciriotti
Messaggi: 23416
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Nomenclature of the perovskite supergroup: A hierarchical system of classification based on structure and compositio

Messaggio da Marco E. Ciriotti » lun 10 apr, 2017 18:00

Spedito, Luciano.
Buona lettura (sono 50 pagine!).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Luciano Vaccari
Messaggi: 10769
Iscritto il: mer 30 giu, 2004 8:23
Località: Via Pietro Giusti 23 41043 Formigine -MO-

Re: Nomenclature of the perovskite supergroup: A hierarchical system of classification based on structure and compositio

Messaggio da Luciano Vaccari » mar 11 apr, 2017 8:52

Ricevuto.
Grazie Marco.
Ben oltre le idee di giusto e di sbagliato c'è un campo. Ti aspetterò laggiù.
(Jalaluddin Rumi- XIII sec.)

Luciano
Socio AMI zona Modena
(Formigine)

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