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Title: Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO 2 single crystals

Abstract

In this study, LiAlO 2 crystals doped with rare-earth elements and Ti were produced by the CZ method and spectroscopic and neutron detection properties were investigated. Photoluminescence revealed no clear luminescent activation of LiAlO 2 by the rare-earth dopants though some interesting luminescence was observed from secondary phases within the crystal. Gamma-ray pulse height spectra collected using a 137Cs source exhibited only a Compton edge for the crystals. Neutron modeling using Monte Carlo N-Particle Transport Code revealed most neutrons used in the detection setup are thermalized, and while using natural lithium in the crystal growth, which contains 7.6% 6Li, a 10 mm Ø by 10 mm sample of LiAlO 2 has a 70.7% intrinsic thermal neutron capture efficiency. Furthermore, the pulse height spectra collected using a 241Am-Be neutron source demonstrated a distinct neutron peak.

Authors:
 [1];  [1];  [1];  [2];  [1]
  1. Washington State Univ., Pullman, WA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1376735
Alternate Identifier(s):
OSTI ID: 1364380
Report Number(s):
PNNL-SA-121859
Journal ID: ISSN 0022-2313; PII: S0022231316315320
Grant/Contract Number:
AC0576RL01830; AC05-76RL01830; PNNL-SA-121859
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of Luminescence
Additional Journal Information:
Journal Volume: 190; Journal ID: ISSN 0022-2313
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Dickens, Peter T., Marcial, Jose, McCloy, John, McDonald, Benjamin S., and Lynn, Kelvin G. Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO2 single crystals. United States: N. p., 2017. Web. doi:10.1016/j.jlumin.2017.05.047.
Dickens, Peter T., Marcial, Jose, McCloy, John, McDonald, Benjamin S., & Lynn, Kelvin G. Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO2 single crystals. United States. doi:10.1016/j.jlumin.2017.05.047.
Dickens, Peter T., Marcial, Jose, McCloy, John, McDonald, Benjamin S., and Lynn, Kelvin G. Wed . "Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO2 single crystals". United States. doi:10.1016/j.jlumin.2017.05.047.
@article{osti_1376735,
title = {Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO2 single crystals},
author = {Dickens, Peter T. and Marcial, Jose and McCloy, John and McDonald, Benjamin S. and Lynn, Kelvin G.},
abstractNote = {In this study, LiAlO2 crystals doped with rare-earth elements and Ti were produced by the CZ method and spectroscopic and neutron detection properties were investigated. Photoluminescence revealed no clear luminescent activation of LiAlO2 by the rare-earth dopants though some interesting luminescence was observed from secondary phases within the crystal. Gamma-ray pulse height spectra collected using a 137Cs source exhibited only a Compton edge for the crystals. Neutron modeling using Monte Carlo N-Particle Transport Code revealed most neutrons used in the detection setup are thermalized, and while using natural lithium in the crystal growth, which contains 7.6% 6Li, a 10 mm Ø by 10 mm sample of LiAlO2 has a 70.7% intrinsic thermal neutron capture efficiency. Furthermore, the pulse height spectra collected using a 241Am-Be neutron source demonstrated a distinct neutron peak.},
doi = {10.1016/j.jlumin.2017.05.047},
journal = {Journal of Luminescence},
number = ,
volume = 190,
place = {United States},
year = {Wed May 17 00:00:00 EDT 2017},
month = {Wed May 17 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jlumin.2017.05.047

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  • In this study, LiAlO 2 crystals doped with rare-earth elements and Ti were produced by the CZ method and spectroscopic and neutron detection properties were investigated. Photoluminescence revealed no clear luminescent activation of LiAlO 2 by the rare-earth dopants though some interesting luminescence was observed from secondary phases within the crystal. Gamma-ray pulse height spectra collected using a 137Cs source exhibited only a Compton edge for the crystals. Neutron modeling using Monte Carlo N-Particle Transport Code revealed most neutrons used in the detection setup are thermalized, and while using natural lithium in the crystal growth, which contains 7.6% 6Li, amore » 10 mm Ø by 10 mm sample of LiAlO 2 has a 70.7% intrinsic thermal neutron capture efficiency. Furthermore, the pulse height spectra collected using a 241Am-Be neutron source demonstrated a distinct neutron peak.« less
  • In this study, LiAlO2 crystals doped with rare-earth elements and Ti were produced by the CZ method and spectroscopic and neutron detection properties were investigated. Photoluminescence revealed no clear luminescent activation of LiAlO2 by the rare-earth dopants though some interesting luminescence was observed from secondary phases within the crystal. Gamma-ray pulse height spectra collected using a 137Cs source exhibited only a Compton edge for the crystals. Neutron modeling using Monte Carlo N-Particle Transport Code revealed most neutrons used in the detection setup are thermalized, and while using natural lithium in the crystal growth, which contains 7.6 % 6Li, a 10more » mm Ø by 10 mm sample of LiAlO2 has a 70.7 % intrinsic thermal neutron capture efficiency. Furthermore, the pulse height spectra collected using a 241Am-Be neutron source demonstrated a distinct neutron peak.« less
  • In this Letter, we studied the electrical transport, magnetic property, magnetoresistance and anomalous Hall properties of La-, Sm-, Ho-, and Dy-doped quasi-two dimensional K{sub 0.58}RhO{sub 2} single crystals. At low temperature (<10 K), a significant magnetoresistance (36%) can be observed in these samples. Accordingly, the “glassy ferromagnetism” is revealed by temperature-dependent magnetization in these samples. The significant magnetoresistance is related to the granular ferromagnetism. The unconventional anomalous Hall effect is also observed in magnetic atoms doped samples. Our finding shields more light on the magnetic, magnetoresistance, and anomalous Hall properties of quasi-two-dimensional material systems doped with magnetic ions.
  • Owing to an efficient energy transfer to 4f electrons, doping with rare earths (REs) allows improvement of the quantum yield of luminescence and the creation of new emitting centers in crystals. For these systems, investigation of the mechanism for excitation energy transfer and identification of electron transitions responsible for the emission bands observed are also of current interest. In luminescing systems containing REs, efficient transfer of excitation energy from one ion to another may result in sensitized luminescence. In this work, we studied the interaction of Eu{sup 2+} ions with Er, Pr, and Sm dopant ions.