Insights on the various structural, optical and dielectric characteristics of La1-xCaxFeO3 perovskite-type oxides synthesized through solution-combustion technique
Perovskite-type oxides La 1- x Ca x FeO 3 ( x = 0.0–1.0) were synthesized using combustion technique. The samples have been investigated using scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet–visible diffuse...
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| creator | Kashyap, Shreyas J. Sankannavar, Ravi Madhu, G. M. |
| description | Perovskite-type oxides La
1-
x
Ca
x
FeO
3
(
x
= 0.0–1.0) were synthesized using combustion technique. The samples have been investigated using scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy (DRS), X-ray powder diffraction (XRPD) using Rietveld refinement, thermogravimetric analysis (TGA) and dielectric spectroscopy. The SEM images showed spherical-shaped agglomerates having a non-uniform distribution of size. The EDX results suggested that the experimental chemical composition was in good accordance with the nominal values. FT-IR revealed multiple peaks in the range of 580–510 cm
−1
due to asymmetric stretching of the octahedron. The reflectance spectra showed characteristic
d
→
d
transitions arising from the Fe 3
d
and the highest optical band gap energy (
E
g
) of 2.57 eV was exhibited by LaFeO
3
, while the lowest
E
g
(1.41 eV) was shown by La
1-
x
Ca
x
FeO
3
with
x
= 0.6. The results suggest that these samples are suitable for photocatalytic applications. From phase evaluation of the diffraction patterns, it was found that five distinct phases exist in the series. A phase transformation from orthorhombic (
Pnma
) to cubic (
P
m
3
¯
m
) was found when
x
was increased from 0.4 to 0.6. TGA showed that LaFeO
3
was the most stable with a residual mass of ~ 97 wt% at 900
∘
C
compared to CaFeO
3
(~ 70 wt% at 900
∘
C
). The evaluation of frequency-dependent (20 Hz–20 MHz) dielectric properties agreed with the Maxwell–Wagner two-layer model. After Ca
2+
substitution,
tan
δ
at 20 Hz significantly reduced from ~ 10
3
for
x
= 0 to ~ 10
0
for
x
= 1.0. The high polarization observed was due to
e
−
hopping between Fe
2+
↔
Fe
3+
. The electrical models of the samples show non-Debye type relaxation behavior, while the ac conductivity enhanced with increasing frequency which was in accordance with Koop’s phenomenological theory. |
| doi_str_mv | 10.1007/s00339-022-05628-4 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_journals_2668322601</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2668322601</sourcerecordid><originalsourceid>FETCH-LOGICAL-c249t-2fd9fd4058a4c8e350e227ca852117d05ede8e85f8d09777688df1a1b290d8893</originalsourceid><addsrcrecordid>eNp9kc1OHDEQhK0IpCyEF8jJUq44tO358RzRKhCklbjA2TJ2z47JMJ7YHrTL6_CiMSxSbvTF3XJVfYci5DuHnxygvUgAUnYMhGBQN0Kx6gtZ8UqWs5FwRFbQVS1Tsmu-kpOUHqFMJcSKvN5MyW-HnGiYaB6QPpvow5JoynGxeYlmPKdhzt6akZrJUedxRJujt9QOJhqbMfpU_ktCTzeGs93a7K7wVtIZY3hOf3xGlvcz0rDzDkvyfiqg5F_QFWIMy3agKYxL9mFiNjw9LOltpRntMPm_C34jx70ZE559vKfk_urX3fo329xe36wvN8yKqstM9K7rXQW1MpVVKGtAIVprVC04bx3U6FChqnvloGvbtlHK9dzwB9GBU6qTp-THIXeOoWBT1o9hiVNBatE0SgrRAC8qcVDZGFKK2Os5-icT95qDfitDH8rQpQz9XoauikkeTKmIpy3G_9GfuP4BrOeRMg</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2668322601</pqid></control><display><type>article</type><title>Insights on the various structural, optical and dielectric characteristics of La1-xCaxFeO3 perovskite-type oxides synthesized through solution-combustion technique</title><source>SpringerLink Journals - AutoHoldings</source><creator>Kashyap, Shreyas J. ; Sankannavar, Ravi ; Madhu, G. M.</creator><creatorcontrib>Kashyap, Shreyas J. ; Sankannavar, Ravi ; Madhu, G. M.</creatorcontrib><description>Perovskite-type oxides La
1-
x
Ca
x
FeO
3
(
x
= 0.0–1.0) were synthesized using combustion technique. The samples have been investigated using scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy (DRS), X-ray powder diffraction (XRPD) using Rietveld refinement, thermogravimetric analysis (TGA) and dielectric spectroscopy. The SEM images showed spherical-shaped agglomerates having a non-uniform distribution of size. The EDX results suggested that the experimental chemical composition was in good accordance with the nominal values. FT-IR revealed multiple peaks in the range of 580–510 cm
−1
due to asymmetric stretching of the octahedron. The reflectance spectra showed characteristic
d
→
d
transitions arising from the Fe 3
d
and the highest optical band gap energy (
E
g
) of 2.57 eV was exhibited by LaFeO
3
, while the lowest
E
g
(1.41 eV) was shown by La
1-
x
Ca
x
FeO
3
with
x
= 0.6. The results suggest that these samples are suitable for photocatalytic applications. From phase evaluation of the diffraction patterns, it was found that five distinct phases exist in the series. A phase transformation from orthorhombic (
Pnma
) to cubic (
P
m
3
¯
m
) was found when
x
was increased from 0.4 to 0.6. TGA showed that LaFeO
3
was the most stable with a residual mass of ~ 97 wt% at 900
∘
C
compared to CaFeO
3
(~ 70 wt% at 900
∘
C
). The evaluation of frequency-dependent (20 Hz–20 MHz) dielectric properties agreed with the Maxwell–Wagner two-layer model. After Ca
2+
substitution,
tan
δ
at 20 Hz significantly reduced from ~ 10
3
for
x
= 0 to ~ 10
0
for
x
= 1.0. The high polarization observed was due to
e
−
hopping between Fe
2+
↔
Fe
3+
. The electrical models of the samples show non-Debye type relaxation behavior, while the ac conductivity enhanced with increasing frequency which was in accordance with Koop’s phenomenological theory.</description><identifier>ISSN: 0947-8396</identifier><identifier>EISSN: 1432-0630</identifier><identifier>DOI: 10.1007/s00339-022-05628-4</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Applied physics ; Calcium ions ; Characterization and Evaluation of Materials ; Chemical composition ; Combustion ; Condensed Matter Physics ; Dielectric properties ; Diffraction patterns ; Diffuse reflectance spectroscopy ; Energy dispersive X ray spectroscopy ; Energy gap ; Ferrites ; Fourier transforms ; Infrared spectroscopy ; Lanthanum compounds ; Machines ; Manufacturing ; Materials science ; Mathematical models ; Nanotechnology ; Optical and Electronic Materials ; Perovskites ; Phase transitions ; Physics ; Physics and Astronomy ; Processes ; Scanning electron microscopy ; Spectrum analysis ; Surfaces and Interfaces ; Synthesis ; Thermogravimetric analysis ; Thin Films ; Ultraviolet reflection ; X ray powder diffraction</subject><ispartof>Applied physics. A, Materials science & processing, 2022-06, Vol.128 (6), Article 518</ispartof><rights>The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature 2022</rights><rights>The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature 2022.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c249t-2fd9fd4058a4c8e350e227ca852117d05ede8e85f8d09777688df1a1b290d8893</citedby><cites>FETCH-LOGICAL-c249t-2fd9fd4058a4c8e350e227ca852117d05ede8e85f8d09777688df1a1b290d8893</cites><orcidid>0000-0002-0074-1226</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00339-022-05628-4$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00339-022-05628-4$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Kashyap, Shreyas J.</creatorcontrib><creatorcontrib>Sankannavar, Ravi</creatorcontrib><creatorcontrib>Madhu, G. M.</creatorcontrib><title>Insights on the various structural, optical and dielectric characteristics of La1-xCaxFeO3 perovskite-type oxides synthesized through solution-combustion technique</title><title>Applied physics. A, Materials science & processing</title><addtitle>Appl. Phys. A</addtitle><description>Perovskite-type oxides La
1-
x
Ca
x
FeO
3
(
x
= 0.0–1.0) were synthesized using combustion technique. The samples have been investigated using scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy (DRS), X-ray powder diffraction (XRPD) using Rietveld refinement, thermogravimetric analysis (TGA) and dielectric spectroscopy. The SEM images showed spherical-shaped agglomerates having a non-uniform distribution of size. The EDX results suggested that the experimental chemical composition was in good accordance with the nominal values. FT-IR revealed multiple peaks in the range of 580–510 cm
−1
due to asymmetric stretching of the octahedron. The reflectance spectra showed characteristic
d
→
d
transitions arising from the Fe 3
d
and the highest optical band gap energy (
E
g
) of 2.57 eV was exhibited by LaFeO
3
, while the lowest
E
g
(1.41 eV) was shown by La
1-
x
Ca
x
FeO
3
with
x
= 0.6. The results suggest that these samples are suitable for photocatalytic applications. From phase evaluation of the diffraction patterns, it was found that five distinct phases exist in the series. A phase transformation from orthorhombic (
Pnma
) to cubic (
P
m
3
¯
m
) was found when
x
was increased from 0.4 to 0.6. TGA showed that LaFeO
3
was the most stable with a residual mass of ~ 97 wt% at 900
∘
C
compared to CaFeO
3
(~ 70 wt% at 900
∘
C
). The evaluation of frequency-dependent (20 Hz–20 MHz) dielectric properties agreed with the Maxwell–Wagner two-layer model. After Ca
2+
substitution,
tan
δ
at 20 Hz significantly reduced from ~ 10
3
for
x
= 0 to ~ 10
0
for
x
= 1.0. The high polarization observed was due to
e
−
hopping between Fe
2+
↔
Fe
3+
. The electrical models of the samples show non-Debye type relaxation behavior, while the ac conductivity enhanced with increasing frequency which was in accordance with Koop’s phenomenological theory.</description><subject>Applied physics</subject><subject>Calcium ions</subject><subject>Characterization and Evaluation of Materials</subject><subject>Chemical composition</subject><subject>Combustion</subject><subject>Condensed Matter Physics</subject><subject>Dielectric properties</subject><subject>Diffraction patterns</subject><subject>Diffuse reflectance spectroscopy</subject><subject>Energy dispersive X ray spectroscopy</subject><subject>Energy gap</subject><subject>Ferrites</subject><subject>Fourier transforms</subject><subject>Infrared spectroscopy</subject><subject>Lanthanum compounds</subject><subject>Machines</subject><subject>Manufacturing</subject><subject>Materials science</subject><subject>Mathematical models</subject><subject>Nanotechnology</subject><subject>Optical and Electronic Materials</subject><subject>Perovskites</subject><subject>Phase transitions</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Processes</subject><subject>Scanning electron microscopy</subject><subject>Spectrum analysis</subject><subject>Surfaces and Interfaces</subject><subject>Synthesis</subject><subject>Thermogravimetric analysis</subject><subject>Thin Films</subject><subject>Ultraviolet reflection</subject><subject>X ray powder diffraction</subject><issn>0947-8396</issn><issn>1432-0630</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNp9kc1OHDEQhK0IpCyEF8jJUq44tO358RzRKhCklbjA2TJ2z47JMJ7YHrTL6_CiMSxSbvTF3XJVfYci5DuHnxygvUgAUnYMhGBQN0Kx6gtZ8UqWs5FwRFbQVS1Tsmu-kpOUHqFMJcSKvN5MyW-HnGiYaB6QPpvow5JoynGxeYlmPKdhzt6akZrJUedxRJujt9QOJhqbMfpU_ktCTzeGs93a7K7wVtIZY3hOf3xGlvcz0rDzDkvyfiqg5F_QFWIMy3agKYxL9mFiNjw9LOltpRntMPm_C34jx70ZE559vKfk_urX3fo329xe36wvN8yKqstM9K7rXQW1MpVVKGtAIVprVC04bx3U6FChqnvloGvbtlHK9dzwB9GBU6qTp-THIXeOoWBT1o9hiVNBatE0SgrRAC8qcVDZGFKK2Os5-icT95qDfitDH8rQpQz9XoauikkeTKmIpy3G_9GfuP4BrOeRMg</recordid><startdate>20220601</startdate><enddate>20220601</enddate><creator>Kashyap, Shreyas J.</creator><creator>Sankannavar, Ravi</creator><creator>Madhu, G. M.</creator><general>Springer Berlin Heidelberg</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0002-0074-1226</orcidid></search><sort><creationdate>20220601</creationdate><title>Insights on the various structural, optical and dielectric characteristics of La1-xCaxFeO3 perovskite-type oxides synthesized through solution-combustion technique</title><author>Kashyap, Shreyas J. ; Sankannavar, Ravi ; Madhu, G. M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c249t-2fd9fd4058a4c8e350e227ca852117d05ede8e85f8d09777688df1a1b290d8893</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Applied physics</topic><topic>Calcium ions</topic><topic>Characterization and Evaluation of Materials</topic><topic>Chemical composition</topic><topic>Combustion</topic><topic>Condensed Matter Physics</topic><topic>Dielectric properties</topic><topic>Diffraction patterns</topic><topic>Diffuse reflectance spectroscopy</topic><topic>Energy dispersive X ray spectroscopy</topic><topic>Energy gap</topic><topic>Ferrites</topic><topic>Fourier transforms</topic><topic>Infrared spectroscopy</topic><topic>Lanthanum compounds</topic><topic>Machines</topic><topic>Manufacturing</topic><topic>Materials science</topic><topic>Mathematical models</topic><topic>Nanotechnology</topic><topic>Optical and Electronic Materials</topic><topic>Perovskites</topic><topic>Phase transitions</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>Processes</topic><topic>Scanning electron microscopy</topic><topic>Spectrum analysis</topic><topic>Surfaces and Interfaces</topic><topic>Synthesis</topic><topic>Thermogravimetric analysis</topic><topic>Thin Films</topic><topic>Ultraviolet reflection</topic><topic>X ray powder diffraction</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kashyap, Shreyas J.</creatorcontrib><creatorcontrib>Sankannavar, Ravi</creatorcontrib><creatorcontrib>Madhu, G. M.</creatorcontrib><collection>CrossRef</collection><jtitle>Applied physics. A, Materials science & processing</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kashyap, Shreyas J.</au><au>Sankannavar, Ravi</au><au>Madhu, G. M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Insights on the various structural, optical and dielectric characteristics of La1-xCaxFeO3 perovskite-type oxides synthesized through solution-combustion technique</atitle><jtitle>Applied physics. A, Materials science & processing</jtitle><stitle>Appl. Phys. A</stitle><date>2022-06-01</date><risdate>2022</risdate><volume>128</volume><issue>6</issue><artnum>518</artnum><issn>0947-8396</issn><eissn>1432-0630</eissn><abstract>Perovskite-type oxides La
1-
x
Ca
x
FeO
3
(
x
= 0.0–1.0) were synthesized using combustion technique. The samples have been investigated using scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy (DRS), X-ray powder diffraction (XRPD) using Rietveld refinement, thermogravimetric analysis (TGA) and dielectric spectroscopy. The SEM images showed spherical-shaped agglomerates having a non-uniform distribution of size. The EDX results suggested that the experimental chemical composition was in good accordance with the nominal values. FT-IR revealed multiple peaks in the range of 580–510 cm
−1
due to asymmetric stretching of the octahedron. The reflectance spectra showed characteristic
d
→
d
transitions arising from the Fe 3
d
and the highest optical band gap energy (
E
g
) of 2.57 eV was exhibited by LaFeO
3
, while the lowest
E
g
(1.41 eV) was shown by La
1-
x
Ca
x
FeO
3
with
x
= 0.6. The results suggest that these samples are suitable for photocatalytic applications. From phase evaluation of the diffraction patterns, it was found that five distinct phases exist in the series. A phase transformation from orthorhombic (
Pnma
) to cubic (
P
m
3
¯
m
) was found when
x
was increased from 0.4 to 0.6. TGA showed that LaFeO
3
was the most stable with a residual mass of ~ 97 wt% at 900
∘
C
compared to CaFeO
3
(~ 70 wt% at 900
∘
C
). The evaluation of frequency-dependent (20 Hz–20 MHz) dielectric properties agreed with the Maxwell–Wagner two-layer model. After Ca
2+
substitution,
tan
δ
at 20 Hz significantly reduced from ~ 10
3
for
x
= 0 to ~ 10
0
for
x
= 1.0. The high polarization observed was due to
e
−
hopping between Fe
2+
↔
Fe
3+
. The electrical models of the samples show non-Debye type relaxation behavior, while the ac conductivity enhanced with increasing frequency which was in accordance with Koop’s phenomenological theory.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s00339-022-05628-4</doi><orcidid>https://orcid.org/0000-0002-0074-1226</orcidid></addata></record> |
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| ispartof | Applied physics. A, Materials science & processing, 2022-06, Vol.128 (6), Article 518 |
| issn | 0947-8396 1432-0630 |
| language | eng |
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| source | SpringerLink Journals - AutoHoldings |
| subjects | Applied physics Calcium ions Characterization and Evaluation of Materials Chemical composition Combustion Condensed Matter Physics Dielectric properties Diffraction patterns Diffuse reflectance spectroscopy Energy dispersive X ray spectroscopy Energy gap Ferrites Fourier transforms Infrared spectroscopy Lanthanum compounds Machines Manufacturing Materials science Mathematical models Nanotechnology Optical and Electronic Materials Perovskites Phase transitions Physics Physics and Astronomy Processes Scanning electron microscopy Spectrum analysis Surfaces and Interfaces Synthesis Thermogravimetric analysis Thin Films Ultraviolet reflection X ray powder diffraction |
| title | Insights on the various structural, optical and dielectric characteristics of La1-xCaxFeO3 perovskite-type oxides synthesized through solution-combustion technique |
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