Raman scattering study of the high-temperature vibrational properties and stability of CaGeO3 perovskite

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Authors:Durben, Dan J.; Wolf, George H.; McMillan, Paul F.
Author Affiliations:Primary:
Arizona State University, Tempe, AZ, United States
Volume Title:Physics and Chemistry of Minerals
Source:Physics and Chemistry of Minerals, 18(4), p.215-223. Publisher: Springer-Verlag, Berlin-New York, Federal Republic of Germany. ISSN: 0342-1791
Publication Date:1991
Note:In English. 49 refs.; illus., incl. 2 tables
Summary:The vibrational properties of metastable CaGeO3 perovskite are investigated as a function of T using Raman scattering. Mode- assignments are derived from polarized spectra of optically oriented single crystals. Neither symmetry-breaking structural transformations nor soft-mode behaviour are revealed in the Raman spectra between room T and 650 degrees C. Only a small decrease in the local static octahedral tilt angles can be inferred from the Raman data over this T range. A Landau extrapolation of the lowest frequency Ag modes suggests that these modes become critical near 2000 degrees C, a T that is above the extrapolated zero P melting points. [Authors' abstract] [P.Br.]
Subjects:Crystals; Experimental studies; High temperature; Lower mantle; Magnesian silicates; Mantle; Melting; Oxides; Perovskite; Petrology; Physical properties; Raman spectra; Silicates; Spectra; Temperature; Calcium germanate
Abstract Numbers:92M/2633
Record ID:1997003551
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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040 |a ViAlAGI  |c ViAlAGI 
072 7 |a 17B  |2 georeft 
100 1 |a Durben, Dan J.  |e analytic author  |u Arizona State University, Tempe, AZ 
245 1 0 |a Raman scattering study of the high-temperature vibrational properties and stability of CaGeO<3` perovskite 
300 |a p. 215-223 
500 |a In English. 49 refs. 
500 |a Abstract number: 92M/2633 
500 |a Abstractor: P.Br. 
500 |a Affiliation: Arizona State University; Tempe, AZ; USA; United States 
500 |a Key title: Physics and Chemistry of Minerals 
500 |a Source note: Physics and Chemistry of Minerals, 18(4), p.215-223. Publisher: Springer-Verlag, Berlin-New York, Federal Republic of Germany. ISSN: 0342-1791 
500 |a Publication type: journal article 
504 |b 49 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a The vibrational properties of metastable CaGeO<3` perovskite are investigated as a function of T using Raman scattering. Mode- assignments are derived from polarized spectra of optically oriented single crystals. Neither symmetry-breaking structural transformations nor soft-mode behaviour are revealed in the Raman spectra between room T and 650 degrees C. Only a small decrease in the local static octahedral tilt angles can be inferred from the Raman data over this T range. A Landau extrapolation of the lowest frequency A<g` modes suggests that these modes become critical near 2000 degrees C, a T that is above the extrapolated zero P melting points. [Authors' abstract] 
650 7 |a Crystals  |2 georeft 
650 7 |a Experimental studies  |2 georeft 
650 7 |a High temperature  |2 georeft 
650 7 |a Lower mantle  |2 georeft 
650 7 |a Magnesian silicates  |2 georeft 
650 7 |a Mantle  |2 georeft 
650 7 |a Melting  |2 georeft 
650 7 |a Oxides  |2 georeft 
650 7 |a Perovskite  |2 georeft 
650 7 |a Petrology  |2 georeft 
650 7 |a Physical properties  |2 georeft 
650 7 |a Raman spectra  |2 georeft 
650 7 |a Silicates  |2 georeft 
650 7 |a Spectra  |2 georeft 
650 7 |a Temperature  |2 georeft 
653 |a Calcium germanate 
700 1 |a Wolf, George H.,  |e analytic author 
700 1 |a McMillan, Paul F.,  |e analytic author 
773 0 |t Physics and Chemistry of Minerals  |d Berlin-New York : Springer-Verlag, Dec. 1991  |x 0342-1791  |y PCMIDU  |n Physics and Chemistry of Minerals, 18(4), p.215-223. Publisher: Springer-Verlag, Berlin-New York, Federal Republic of Germany. ISSN: 0342-1791 Publication type: journal article  |g Vol. 18, no. 4  |h illus., incl. 2 tables