title: Iron(III) complexes of the metalloligand [Pt2(μ-S)2(PPh3)4]

authors: Henderson, William

subjects: Crystal structure

abstract: Reaction of [Pt₂(μ-S)₂(PPh₃) ₄] with (NH₄)₂SO₄•FeSO ₄•6H₂O and 2 mol equivalents of picolinic acid (HPic) or 8-hydroxyquinoline (HQ) and trimethylamine base gives iron(III) adducts [Pt₂(μ-S)₂(PPh₃) ₄FePic2]+ and [Pt₂(μ-S) ₂(PPh₃)₄FeQ₂]+, isolated as hexafluorophosphate salts; these complexes are the first isolated iron(III) derivatives of [Pt₂(μ-S)₂(PPh₃) ₄]. The X-ray structure of [Pt₂(μ-S) ₂(PPh₃)₄FePic2]PF6 shows the presence of a rare distorted trigonal prismatic coordination geometry while magnetic measurements confirm the presence of high-spin iron(III) centres in the complexes.

text: Iron(III) complexes of the metalloligand [Pt2(μ-S)2(PPh3)4] Reaction of [Pt₂(μ-S)₂(PPh₃) ₄] with (NH₄)₂SO₄•FeSO ₄•6H₂O and 2 mol equivalents of picolinic acid (HPic) or 8-hydroxyquinoline (HQ) and trimethylamine base gives iron(III) adducts [Pt₂(μ-S)₂(PPh₃) ₄FePic2]+ and [Pt₂(μ-S) ₂(PPh₃)₄FeQ₂]+, isolated as hexafluorophosphate salts; these complexes are the first isolated iron(III) derivatives of [Pt₂(μ-S)₂(PPh₃) ₄]. The X-ray structure of [Pt₂(μ-S) ₂(PPh₃)₄FePic2]PF6 shows the presence of a rare distorted trigonal prismatic coordination geometry while magnetic measurements confirm the presence of high-spin iron(III) centres in the complexes.

year: 2013

title: Microstructural evolution during mechanical milling of Ti/Al powder mixture and production of intermetallic TiAl cathode target

authors: Gabbitas, Brian

subjects: titanium aluminides

abstract: Titanium aluminides are of great technological interest because of their attractive mechanical properties. Mechanical milling/alloying is a promising powder metallurgical technique, which can achieve ultrafine, uniform and manipulable microstructures. In this study, we employed a recently revisited discus mill to produce a composite Ti– (50–57) at.%Al powder feedstock, which is suitable for hot consolidation to produce bulk cathode targets for physical vapour deposition (PVD) coatings. The effects of milling time, quantity of process control agent (PCA) and discus-topowder weight ratio (DPR) on the microstructure evolution of the attendant Ti/Al composite powder were investigated in detail. It was found that to produce Ti/Al composite powders with a fine particle size and a uniform microstructure, the practicable processing parameters should be 2 or 3% isopropanol addition as PCA, 12 h of milling time and at least 13:1 DPR weight ratio. Cathode targets were produced by hot isostatic pressing (HIPing) the as-milled powders. The targets were then used to produce a PVD TiAlN coating which had an average microhardness of 2400 HV.

text: Microstructural evolution during mechanical milling of Ti/Al powder mixture and production of intermetallic TiAl cathode target Titanium aluminides are of great technological interest because of their attractive mechanical properties. Mechanical milling/alloying is a promising powder metallurgical technique, which can achieve ultrafine, uniform and manipulable microstructures. In this study, we employed a recently revisited discus mill to produce a composite Ti– (50–57) at.%Al powder feedstock, which is suitable for hot consolidation to produce bulk cathode targets for physical vapour deposition (PVD) coatings. The effects of milling time, quantity of process control agent (PCA) and discus-topowder weight ratio (DPR) on the microstructure evolution of the attendant Ti/Al composite powder were investigated in detail. It was found that to produce Ti/Al composite powders with a fine particle size and a uniform microstructure, the practicable processing parameters should be 2 or 3% isopropanol addition as PCA, 12 h of milling time and at least 13:1 DPR weight ratio. Cathode targets were produced by hot isostatic pressing (HIPing) the as-milled powders. The targets were then used to produce a PVD TiAlN coating which had an average microhardness of 2400 HV.

year: 2011

title: Treaty People Recognising and Marking Pākehā Culture in Aotearoa New Zealand

authors: Black, Rosanne Marjory

subjects: Pakeha culture

abstract: The suggestion that all people are cultural and live in cultural worlds acts to challenge members of culturally dominant groups as they tend to see their way of life as normal rather than cultural. Dominant group members usually talk about themselves in relation to their national identity (New Zealander, Australian, or American) rather than name being part of a cultural group within their nation state. This study, located in Aotearoa New Zealand, explores with a particular group of New Zealanders, how Pākehā who are members of the dominant group, may come to recognise themselves as being cultural, to name themselves culturally, and to mark aspects of their culture. The contribution that recognising culture makes to a decolonisation agenda is also explored. This study of Pākehā culture is approached from both a realist and a social constructionist perspective. Culture, an abstract concept, is largely theorised as a constructed notion in a historically structured location. How culture is recognised, and the ways it is produced and enacted, through relationships and interactions in the broader structures of New Zealand society were explored using realist thematic methods of analysis. Treaty people are a network of mostly Pākehā activist educators who have engaged in promoting knowledge of and support for Māori claims for justice under Te Tiriti o Waitangi (the Treaty of Waitangi was the document signed by Settlers and Māori leaders in 1840 to establish settlement arrangements). Treaty people are practised in talking about cultural issues largely through their engagement with Māori - Pākehā relationships. The research focused on the situations and processes that stimulated a group of thirty four ‘Treaty people’ to start thinking about themselves as cultural; about what it meant to have a cultural identity; and what they recognised as markers of their culture. I have been a member of this Treaty People network for many years and carry the dual positioning of being the researcher, and a participant, both as a member of the group and as a Pākehā. Data was collected over an eighteen month period from two focus groups in 2003 and 2005. These sessions were video and audio-recorded and later transcribed. I meet with available participants in their own locations early in 2005 and audio-recorded the conversations. The transcriptions and notes form the data for this study. My findings from this study include: • Culture was often first recognised through encounters with different cultural groups and usually when a person is in a situation where they are in a minority. Although, dominant group members do not always see their own daily practices and values as cultural they often name as cultural the practices and values of people different from them. • Recognising and naming ourselves as cultural and marking our culture were difficult tasks that go against the grain of dominance. • Pākehā culture was recognised in a number of ways. Treaty people recognised that there were other forms of knowing about the world and that dominant group members valued being ‘right’ and in control of knowledge. Coming to recognise themselves as cultural unsettled a sense of certainty about their position in the world, and opened up possibilities for new ways to engage in intercultural relationships where participation rather than being in control was valued. • Accepting the name Pākehā implied having a position of responsibility to tangata whenua and to the land. In turn those who have accepted being Pākehā receive a sense of belonging to Aotearoa and a place to stand in justice alongside Māori and other people who are culturally different from them. • While this thesis does not make explicit links between ‘being cultural’ and a decolonisation agenda the Treaty People participants named strategies to support decolonisation and challenge Pākehā dominance which include: recognising practices and values that are perpetuated through colonisation, in particular egalitarianism, assimilation and superiority; recognising Māori as tangata whenua (first people of the land) and Te Tiriti o Waitangi relationships; taking up the challenge to seek justice through striving to deal with past wrongs and to engage in equitable relationships with Māori. This thesis contributes to the psychology and social science literature as it serves to address the question “We don’t have a culture … do we?” I posit that all psychologists do have a culture and provide some rich descriptions, for those who are Pākehā, of how their culture may be recognised, how it might be described and talked about. This is a core cultural competency requirement for psychologists. My thesis also contribute to a growing body of literature from members of dominant groups, who are developing a discourse to explore and make visible their cultural or raced (whiteness) positions of power and privilege.

text: Treaty People Recognising and Marking Pākehā Culture in Aotearoa New Zealand The suggestion that all people are cultural and live in cultural worlds acts to challenge members of culturally dominant groups as they tend to see their way of life as normal rather than cultural. Dominant group members usually talk about themselves in relation to their national identity (New Zealander, Australian, or American) rather than name being part of a cultural group within their nation state. This study, located in Aotearoa New Zealand, explores with a particular group of New Zealanders, how Pākehā who are members of the dominant group, may come to recognise themselves as being cultural, to name themselves culturally, and to mark aspects of their culture. The contribution that recognising culture makes to a decolonisation agenda is also explored. This study of Pākehā culture is approached from both a realist and a social constructionist perspective. Culture, an abstract concept, is largely theorised as a constructed notion in a historically structured location. How culture is recognised, and the ways it is produced and enacted, through relationships and interactions in the broader structures of New Zealand society were explored using realist thematic methods of analysis. Treaty people are a network of mostly Pākehā activist educators who have engaged in promoting knowledge of and support for Māori claims for justice under Te Tiriti o Waitangi (the Treaty of Waitangi was the document signed by Settlers and Māori leaders in 1840 to establish settlement arrangements). Treaty people are practised in talking about cultural issues largely through their engagement with Māori - Pākehā relationships. The research focused on the situations and processes that stimulated a group of thirty four ‘Treaty people’ to start thinking about themselves as cultural; about what it meant to have a cultural identity; and what they recognised as markers of their culture. I have been a member of this Treaty People network for many years and carry the dual positioning of being the researcher, and a participant, both as a member of the group and as a Pākehā. Data was collected over an eighteen month period from two focus groups in 2003 and 2005. These sessions were video and audio-recorded and later transcribed. I meet with available participants in their own locations early in 2005 and audio-recorded the conversations. The transcriptions and notes form the data for this study. My findings from this study include: • Culture was often first recognised through encounters with different cultural groups and usually when a person is in a situation where they are in a minority. Although, dominant group members do not always see their own daily practices and values as cultural they often name as cultural the practices and values of people different from them. • Recognising and naming ourselves as cultural and marking our culture were difficult tasks that go against the grain of dominance. • Pākehā culture was recognised in a number of ways. Treaty people recognised that there were other forms of knowing about the world and that dominant group members valued being ‘right’ and in control of knowledge. Coming to recognise themselves as cultural unsettled a sense of certainty about their position in the world, and opened up possibilities for new ways to engage in intercultural relationships where participation rather than being in control was valued. • Accepting the name Pākehā implied having a position of responsibility to tangata whenua and to the land. In turn those who have accepted being Pākehā receive a sense of belonging to Aotearoa and a place to stand in justice alongside Māori and other people who are culturally different from them. • While this thesis does not make explicit links between ‘being cultural’ and a decolonisation agenda the Treaty People participants named strategies to support decolonisation and challenge Pākehā dominance which include: recognising practices and values that are perpetuated through colonisation, in particular egalitarianism, assimilation and superiority; recognising Māori as tangata whenua (first people of the land) and Te Tiriti o Waitangi relationships; taking up the challenge to seek justice through striving to deal with past wrongs and to engage in equitable relationships with Māori. This thesis contributes to the psychology and social science literature as it serves to address the question “We don’t have a culture … do we?” I posit that all psychologists do have a culture and provide some rich descriptions, for those who are Pākehā, of how their culture may be recognised, how it might be described and talked about. This is a core cultural competency requirement for psychologists. My thesis also contribute to a growing body of literature from members of dominant groups, who are developing a discourse to explore and make visible their cultural or raced (whiteness) positions of power and privilege.

year: 2010