X-ray and spectral characterization of defects in garnets
Identifieur interne : 001377 ( Pascal/Curation ); précédent : 001376; suivant : 001378X-ray and spectral characterization of defects in garnets
Auteurs : A. Lupei [Roumanie] ; C. Stoicescu [Roumanie] ; V. Lupei [Roumanie]Source :
- Journal of crystal growth [ 0022-0248 ] ; 1997.
Descripteurs français
- Pascal (Inist)
- Etude expérimentale, Défaut cristallin, Grenats, Impureté, Spectrométrie RX, Spectrométrie optique, Addition néodyme, Addition thulium, Addition praséodyme, Composé ternaire, Yttrium oxyde, Aluminium oxyde, Gadolinium oxyde, Gallium oxyde, Matériau laser, 6172F, Y3Al5O12, Al O Y, Gd3Ga5O12, Ga Gd O.
English descriptors
- KwdEn :
Abstract
New information on the defects in high temperature (HT) grown YAG (Y3Al5O12) and GGG(Gd3Ga5O12) obtained from X-ray and optical spectroscopy of various rare earth dopants are presented. Low intensity {2 2 2} X-ray reflections, forbidden in the cubic garnet Ia3d space group, with equivalent intensities for the four [1 1 1] directions are observed in both crystals. Structural arguments in connection with optical spectroscopy data on various ions (Nd3+, Tm3+, Pr3+) allow us to assign these reflections (absent in flux grown crystals) to local reduction of symmetry introduced by nonstoichiometric random occupancy of octahedral sites by Y3+ or Gd3+ ions in HT garnets.
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aluminium oxides</term>
<term>Crystal defects</term>
<term>Experimental study</term>
<term>Gadolinium oxides</term>
<term>Gallium oxides</term>
<term>Garnets</term>
<term>Impurities</term>
<term>Laser materials</term>
<term>Neodymium additions</term>
<term>Optical spectrometry</term>
<term>Praseodymium additions</term>
<term>Ternary compounds</term>
<term>Thulium additions</term>
<term>X-ray spectroscopy</term>
<term>Yttrium oxides</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term>
<term>Défaut cristallin</term>
<term>Grenats</term>
<term>Impureté</term>
<term>Spectrométrie RX</term>
<term>Spectrométrie optique</term>
<term>Addition néodyme</term>
<term>Addition thulium</term>
<term>Addition praséodyme</term>
<term>Composé ternaire</term>
<term>Yttrium oxyde</term>
<term>Aluminium oxyde</term>
<term>Gadolinium oxyde</term>
<term>Gallium oxyde</term>
<term>Matériau laser</term>
<term>6172F</term>
<term>Y3Al5O12</term>
<term>Al O Y</term>
<term>Gd3Ga5O12</term>
<term>Ga Gd O</term>
</keywords>
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<front><div type="abstract" xml:lang="en">New information on the defects in high temperature (HT) grown YAG (Y<sub>3</sub>
Al<sub>5</sub>
O<sub>12</sub>
) and GGG(Gd<sub>3</sub>
Ga<sub>5</sub>
O<sub>12</sub>
) obtained from X-ray and optical spectroscopy of various rare earth dopants are presented. Low intensity {2 2 2} X-ray reflections, forbidden in the cubic garnet Ia3d space group, with equivalent intensities for the four [1 1 1] directions are observed in both crystals. Structural arguments in connection with optical spectroscopy data on various ions (Nd<sup>3+</sup>
, Tm<sup>3+</sup>
, Pr<sup>3+</sup>
) allow us to assign these reflections (absent in flux grown crystals) to local reduction of symmetry introduced by nonstoichiometric random occupancy of octahedral sites by Y<sup>3+</sup>
or Gd<sup>3+</sup>
ions in HT garnets.</div>
</front>
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<fC01 i1="01" l="ENG"><s0>New information on the defects in high temperature (HT) grown YAG (Y<sub>3</sub>
Al<sub>5</sub>
O<sub>12</sub>
) and GGG(Gd<sub>3</sub>
Ga<sub>5</sub>
O<sub>12</sub>
) obtained from X-ray and optical spectroscopy of various rare earth dopants are presented. Low intensity {2 2 2} X-ray reflections, forbidden in the cubic garnet Ia3d space group, with equivalent intensities for the four [1 1 1] directions are observed in both crystals. Structural arguments in connection with optical spectroscopy data on various ions (Nd<sup>3+</sup>
, Tm<sup>3+</sup>
, Pr<sup>3+</sup>
) allow us to assign these reflections (absent in flux grown crystals) to local reduction of symmetry introduced by nonstoichiometric random occupancy of octahedral sites by Y<sup>3+</sup>
or Gd<sup>3+</sup>
ions in HT garnets.</s0>
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<s5>04</s5>
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<s5>05</s5>
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<s5>06</s5>
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<s5>06</s5>
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<s5>06</s5>
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<s5>07</s5>
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<s5>07</s5>
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<s5>08</s5>
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<s5>09</s5>
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<s5>11</s5>
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<s5>11</s5>
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<s2>NK</s2>
<s5>13</s5>
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<s2>NK</s2>
<s5>14</s5>
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<s2>NK</s2>
<s5>14</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE"><s0>Gadolinium oxyde</s0>
<s2>NK</s2>
<s5>16</s5>
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<s2>NK</s2>
<s5>16</s5>
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<s2>NK</s2>
<s5>17</s5>
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<s2>NK</s2>
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<s5>18</s5>
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<fC03 i1="16" i2="3" l="FRE"><s0>6172F</s0>
<s2>PAC</s2>
<s4>INC</s4>
<s5>56</s5>
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<fC03 i1="17" i2="3" l="FRE"><s0>Y3Al5O12</s0>
<s4>INC</s4>
<s5>92</s5>
</fC03>
<fC03 i1="18" i2="3" l="FRE"><s0>Al O Y</s0>
<s4>INC</s4>
<s5>93</s5>
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<fC03 i1="19" i2="3" l="FRE"><s0>Gd3Ga5O12</s0>
<s4>INC</s4>
<s5>94</s5>
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<s4>INC</s4>
<s5>95</s5>
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