Titanium incorporation and Ti-VI(3+)-Ti-IV(4+) charge transfer in synthetic diopside
(2006) In American Mineralogist 91(11-12). p.1794-1801- Abstract
- A series of Ti-doped diopside samples synthesized by fluxgrowth methods under reducing conditions were investigated by microanalytical methods and optical absorption spectroscopy, to assess Ti incorporation mechanisms, valence states, and related electronic transitions. Chemical characterization show that Ti occurs both in the tri-and tetravalent states, with Ti4+ preferentially ordered to the tetrahedral position whereas Till is restricted to the M1 position. Charge-balance is maintained by incorporation of Na and minor B, stemming from the flux compound. Polarized optical absorption spectra reveal three major absorption features. Two relatively narrow bands centered at 18 500 and 15 700 cm(-1), mainly polarized in the crystallographic... (More)
- A series of Ti-doped diopside samples synthesized by fluxgrowth methods under reducing conditions were investigated by microanalytical methods and optical absorption spectroscopy, to assess Ti incorporation mechanisms, valence states, and related electronic transitions. Chemical characterization show that Ti occurs both in the tri-and tetravalent states, with Ti4+ preferentially ordered to the tetrahedral position whereas Till is restricted to the M1 position. Charge-balance is maintained by incorporation of Na and minor B, stemming from the flux compound. Polarized optical absorption spectra reveal three major absorption features. Two relatively narrow bands centered at 18 500 and 15 700 cm(-1), mainly polarized in the crystallographic c-direction, display absorbance values that correlate with the calculated Ti3+ (M1) concentration, and are assigned to spin-allowed d-d transitions in Till. A broader band centered around 24 500 cm-1 displays absorbance values that are well correlated with the product of Ti-VI(3+) and Ti-IV(4+). Based on the spectral characteristics of this band, including a strong polarization in the crystallographic b-direction, we assign this band to an Ti-M1(3+)-Ti-T(4+) intervalence charge transfer process. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/685742
- author
- Skogby, Henrik ; Halenius, Ulf ; Kristiansson, Per LU and Ohashi, Haruo
- organization
- publishing date
- 2006
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- minor elements, major and, pyroxene, optical spectroscopy, crystal synthesis, diopside, Ti in pyroxene, order-disorder
- in
- American Mineralogist
- volume
- 91
- issue
- 11-12
- pages
- 1794 - 1801
- publisher
- Mineralogical Society of America
- external identifiers
-
- wos:000242318100008
- scopus:33845249757
- ISSN
- 0003-004X
- DOI
- 10.2138/am.2006.2154
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Nuclear Physics (Faculty of Technology) (011013007)
- id
- 1fa9e5aa-f1eb-453f-96cf-2cfb75c20630 (old id 685742)
- alternative location
- http://www.minsocam.org.ludwig.lub.lu.se/ProcessIP.lasso?year=2006&filename=Skogby_p1794-1801_06.pdf
- date added to LUP
- 2016-04-01 17:07:10
- date last changed
- 2022-01-29 00:28:26
@article{1fa9e5aa-f1eb-453f-96cf-2cfb75c20630,
abstract = {{A series of Ti-doped diopside samples synthesized by fluxgrowth methods under reducing conditions were investigated by microanalytical methods and optical absorption spectroscopy, to assess Ti incorporation mechanisms, valence states, and related electronic transitions. Chemical characterization show that Ti occurs both in the tri-and tetravalent states, with Ti4+ preferentially ordered to the tetrahedral position whereas Till is restricted to the M1 position. Charge-balance is maintained by incorporation of Na and minor B, stemming from the flux compound. Polarized optical absorption spectra reveal three major absorption features. Two relatively narrow bands centered at 18 500 and 15 700 cm(-1), mainly polarized in the crystallographic c-direction, display absorbance values that correlate with the calculated Ti3+ (M1) concentration, and are assigned to spin-allowed d-d transitions in Till. A broader band centered around 24 500 cm-1 displays absorbance values that are well correlated with the product of Ti-VI(3+) and Ti-IV(4+). Based on the spectral characteristics of this band, including a strong polarization in the crystallographic b-direction, we assign this band to an Ti-M1(3+)-Ti-T(4+) intervalence charge transfer process.}},
author = {{Skogby, Henrik and Halenius, Ulf and Kristiansson, Per and Ohashi, Haruo}},
issn = {{0003-004X}},
keywords = {{minor elements; major and; pyroxene; optical spectroscopy; crystal synthesis; diopside; Ti in pyroxene; order-disorder}},
language = {{eng}},
number = {{11-12}},
pages = {{1794--1801}},
publisher = {{Mineralogical Society of America}},
series = {{American Mineralogist}},
title = {{Titanium incorporation and Ti-VI(3+)-Ti-IV(4+) charge transfer in synthetic diopside}},
url = {{http://dx.doi.org/10.2138/am.2006.2154}},
doi = {{10.2138/am.2006.2154}},
volume = {{91}},
year = {{2006}},
}