New dipole relaxators in weakly reduced KTaO3:Li crystals: Dielectric spectroscopy
The temperature-frequency behaviour of ϵ′ (T, f) and tan[δ(T, f)] (13 - 300 K, 120 Hz - 8 MHz) of KTaO 3 :Li (0.1 wt%) single crystals before and after a weak reduction was studied. Below 70 K before reduction, the samples reveal a shoulder in ϵ′ f (T) and a maximum in tan[δ(T)] obeying Arrhenius la...
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| Veröffentlicht in: | Ferroelectrics 1996-09, Vol.186 (1), p.317-320 |
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| creator | Vikhnin, V. Smutný, F. Trepakov, V. Savinov, M. Jastrabík, L. |
| description | The temperature-frequency behaviour of ϵ′ (T, f) and tan[δ(T, f)] (13 - 300 K, 120 Hz - 8 MHz) of KTaO
3
:Li (0.1 wt%) single crystals before and after a weak reduction was studied. Below 70 K before reduction, the samples reveal a shoulder in ϵ′
f
(T) and a maximum in tan[δ(T)] obeying Arrhenius law with an activation energy δ ≈ 1000 K. This is associated with an ordering in clusters of paired reorienting dipolar defects, composed of off-center Li
+
(the leading defect) and another polar impurity, or of a small number of 'pure' clusters of Li
+
ions and(or) reorientations of the hole polaron (O
-
- center), localized near an impurity ion Fe
3+
(Fe
2+
). After reduction, the ϵ′
f
(T) shoulder changes into a maximum, and four new low-temperature Arrhenius-like relaxations emerge. The new relaxations are associated with: (i) charge transfer relaxation in paired oxygen vacancies V
0
- V
0
(with or without trapped electrons) or paired (Ta
3+
- V
0
) - (Ta
3+
- V
0
) centers, (ii) cooperative relaxations in clusters of centers which take part in i and (iii) reorientations of isolated Li
+
off-center ions. |
| doi_str_mv | 10.1080/00150199608218092 |
| format | Article |
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3
:Li (0.1 wt%) single crystals before and after a weak reduction was studied. Below 70 K before reduction, the samples reveal a shoulder in ϵ′
f
(T) and a maximum in tan[δ(T)] obeying Arrhenius law with an activation energy δ ≈ 1000 K. This is associated with an ordering in clusters of paired reorienting dipolar defects, composed of off-center Li
+
(the leading defect) and another polar impurity, or of a small number of 'pure' clusters of Li
+
ions and(or) reorientations of the hole polaron (O
-
- center), localized near an impurity ion Fe
3+
(Fe
2+
). After reduction, the ϵ′
f
(T) shoulder changes into a maximum, and four new low-temperature Arrhenius-like relaxations emerge. The new relaxations are associated with: (i) charge transfer relaxation in paired oxygen vacancies V
0
- V
0
(with or without trapped electrons) or paired (Ta
3+
- V
0
) - (Ta
3+
- V
0
) centers, (ii) cooperative relaxations in clusters of centers which take part in i and (iii) reorientations of isolated Li
+
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3
:Li (0.1 wt%) single crystals before and after a weak reduction was studied. Below 70 K before reduction, the samples reveal a shoulder in ϵ′
f
(T) and a maximum in tan[δ(T)] obeying Arrhenius law with an activation energy δ ≈ 1000 K. This is associated with an ordering in clusters of paired reorienting dipolar defects, composed of off-center Li
+
(the leading defect) and another polar impurity, or of a small number of 'pure' clusters of Li
+
ions and(or) reorientations of the hole polaron (O
-
- center), localized near an impurity ion Fe
3+
(Fe
2+
). After reduction, the ϵ′
f
(T) shoulder changes into a maximum, and four new low-temperature Arrhenius-like relaxations emerge. The new relaxations are associated with: (i) charge transfer relaxation in paired oxygen vacancies V
0
- V
0
(with or without trapped electrons) or paired (Ta
3+
- V
0
) - (Ta
3+
- V
0
) centers, (ii) cooperative relaxations in clusters of centers which take part in i and (iii) reorientations of isolated Li
+
off-center ions.</description><issn>0015-0193</issn><issn>1563-5112</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNp1kN1KAzEQhYMoWKsP4F1eYDX_3RRvpP5isSD1eslmJxBNmyVZqfv2ptQ78WrmzJlvBg5Cl5RcUVKTa0KoJFRrRWpGa6LZEZpQqXglKWXHaLL3q7LAT9FZzh9FciH0BL29wg53vo8BcIJgvs0QU8Z-i3dgPsNYht2XhQ6_rM2Kz5ce2zTmwYQ8x3ceAtgheYtzv29itrEfz9GJKz5c_NYpen-4Xy-equXq8Xlxu6wsE_VQcVCCK6W4MxwsMwxkV1RHpWZEy5lqrdDQMiXAKNJqxwV3SraGAsxq0vIpooe7tjzOCVzTJ78xaWwoafahNH9CKczNgfFbF9PG7GIKXTOYMcTkktlanxv-P_4DGFdnVg</recordid><startdate>19960901</startdate><enddate>19960901</enddate><creator>Vikhnin, V.</creator><creator>Smutný, F.</creator><creator>Trepakov, V.</creator><creator>Savinov, M.</creator><creator>Jastrabík, L.</creator><general>Taylor & Francis Group</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19960901</creationdate><title>New dipole relaxators in weakly reduced KTaO3:Li crystals: Dielectric spectroscopy</title><author>Vikhnin, V. ; Smutný, F. ; Trepakov, V. ; Savinov, M. ; Jastrabík, L.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c248t-3e6436663fa3ec2a2e5d663d159209576bc49eb264ea60b9f343f65ba1ee780b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Vikhnin, V.</creatorcontrib><creatorcontrib>Smutný, F.</creatorcontrib><creatorcontrib>Trepakov, V.</creatorcontrib><creatorcontrib>Savinov, M.</creatorcontrib><creatorcontrib>Jastrabík, L.</creatorcontrib><collection>CrossRef</collection><jtitle>Ferroelectrics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Vikhnin, V.</au><au>Smutný, F.</au><au>Trepakov, V.</au><au>Savinov, M.</au><au>Jastrabík, L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>New dipole relaxators in weakly reduced KTaO3:Li crystals: Dielectric spectroscopy</atitle><jtitle>Ferroelectrics</jtitle><date>1996-09-01</date><risdate>1996</risdate><volume>186</volume><issue>1</issue><spage>317</spage><epage>320</epage><pages>317-320</pages><issn>0015-0193</issn><eissn>1563-5112</eissn><abstract>The temperature-frequency behaviour of ϵ′ (T, f) and tan[δ(T, f)] (13 - 300 K, 120 Hz - 8 MHz) of KTaO
3
:Li (0.1 wt%) single crystals before and after a weak reduction was studied. Below 70 K before reduction, the samples reveal a shoulder in ϵ′
f
(T) and a maximum in tan[δ(T)] obeying Arrhenius law with an activation energy δ ≈ 1000 K. This is associated with an ordering in clusters of paired reorienting dipolar defects, composed of off-center Li
+
(the leading defect) and another polar impurity, or of a small number of 'pure' clusters of Li
+
ions and(or) reorientations of the hole polaron (O
-
- center), localized near an impurity ion Fe
3+
(Fe
2+
). After reduction, the ϵ′
f
(T) shoulder changes into a maximum, and four new low-temperature Arrhenius-like relaxations emerge. The new relaxations are associated with: (i) charge transfer relaxation in paired oxygen vacancies V
0
- V
0
(with or without trapped electrons) or paired (Ta
3+
- V
0
) - (Ta
3+
- V
0
) centers, (ii) cooperative relaxations in clusters of centers which take part in i and (iii) reorientations of isolated Li
+
off-center ions.</abstract><pub>Taylor & Francis Group</pub><doi>10.1080/00150199608218092</doi><tpages>4</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0015-0193 |
| ispartof | Ferroelectrics, 1996-09, Vol.186 (1), p.317-320 |
| issn | 0015-0193 1563-5112 |
| language | eng |
| recordid | cdi_crossref_primary_10_1080_00150199608218092 |
| source | Taylor & Francis Journals Complete |
| title | New dipole relaxators in weakly reduced KTaO3:Li crystals: Dielectric spectroscopy |
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